**POLAR Spacecraft Status As of: Tues, 29 Nov, 16:00 EST**

*(changes from last week in bold border)*

+----------+--------+--------+--------+---------+---------+---------+
| **Subs   | **NOAA | **NOAA | **NOAA | **NOA   | ##### N | ##### N |
| ystem/** | -12D** | -14J** | -15K** | A-16L** | OAA-17M | OAA-18N |
|          |        |        |        |         |         |         |
| **Com    | AM     | AM:    | AM:    | PM:     | AM:     | PM      |
| ponent** | 16     | 20     | 17     | 1       | 2       | 1       |
|          | :56=AN | :57=AN | :57=AN | 4:54=AN | 2:24=AN | 3:54=AN |
|          |        |        |        |         |         |         |
|          | STIP   | STIP   | GAC    | GAC&LAC | GAC&LAC | GAC &   |
|          | data   | data   | data   | data    | data    | LAC     |
|          | only   | only   | only   |         |         | data    |
+----------+--------+--------+--------+---------+---------+---------+
| **LA     | 05     | 12     | 05     | 0       | 6/24/02 | ##      |
| UNCHED** | /14/91 | /30/94 | /13/98 | 9/21/00 |         | ##### 5 |
|          |        |        |        |         |         | /20/05  |
+----------+--------+--------+--------+---------+---------+---------+
| **CNTL   | OBP2   | OBP2   | OBP2   | OBP2    | OBP2    | OBP2    |
| OBP**    |        |        |        |         |         |         |
|          | Rec    | OBP1   |        |         |         |         |
|          | ursive | inope  |        |         |         |         |
|          | SCT    | rative |        |         |         |         |
+----------+--------+--------+--------+---------+---------+---------+
| **BUS**  | B-BUS  | B-BUS  | B-BUS  | B-BUS   | B-BUS   | B-BUS   |
|          |        |        |        |         |         |         |
|          | XSU-1  | XSU2   | XSU-1  | XSU-1   | XSU-1   | XSU-1   |
|          |        | (XSU1  |        |         |         |         |
|          |        | inop)  |        | XSU-1   |         |         |
|          |        |        |        | TOAR    |         |         |
|          |        |        |        | 444     |         |         |
+----------+--------+--------+--------+---------+---------+---------+
| **BUS    | NO     | NO     | NO     | NO      | NO      | NO      |
| VETO**   |        |        |        |         |         |         |
+----------+--------+--------+--------+---------+---------+---------+
| *        | [N     | [N     | [N     | ###     | #####   | [       |
| *ADACS** | ominal | ominal | ominal | ### [RG | # [Nomi | Nominal |
|          | Mode]  | Mode]  | Mode]  | YRO Mod | nal Mod | Mod     |
| X=Yaw    | {.unde | {.unde | {.unde | e]{.und | e]{.und | e]{.und |
|          | rline} | rline} | rline} | erline} | erline} | erline} |
| Y=Roll   |        |        |        |         |         |         |
|          | RG     | Rgm    | Rg     | E       | Rgmode= | Gyro-A  |
| Z=Pitch  | mode=M | ode=Di | mode=M | stimate | Monitor | MIMU-2  |
|          | onitor | sabled | onitor | ROLL    |         |         |
|          |        |        |        |         | Gyro-3  | Z-wheel |
|          | Gyro   | Gyro   | Gyro-3 | Rgmode= | Off     | -Pitch  |
|          | cha    | cha    | Off    | PASSIVE | 6/10/04 |         |
|          | ns=XYZ | ns=XYZ | 6      |         |         | TOAR    |
|          |        |        | /26/00 | Gyro-1  | Gyro    | 447     |
|          |        | I      | Gyro   | Off     | ch      |         |
|          |        | nvesti | cha    | 1       | ans=AAB | M       |
|          |        | gating | ns=AAB | 0/24/05 |         | omentum |
|          |        | insta  |        |         | Gyro-2  | shift   |
|          |        | bility | N2 Low | Gyro-3  | invest  | tra     |
|          |        |        | PSI    | Off     | igation | nsition |
|          |        |        | i      | 6/10/04 |         | started |
|          |        |        | nvalid |         | P       | 1 Nov   |
|          |        |        |        | Gyro    | robable | ended   |
|          |        |        |        | chans   | co      | 18 Nov. |
|          |        |        |        | X-Z     | llision |         |
|          |        |        |        | only    | on 20   |         |
|          |        |        |        |         | Nov at  |         |
|          |        |        |        | TOAR    | 10:31z  |         |
|          |        |        |        | 454     |         |         |
|          |        |        |        |         |         |         |
|          |        |        |        | RGyro   |         |         |
|          |        |        |        | roll    |         |         |
|          |        |        |        | e       |         |         |
|          |        |        |        | stimate |         |         |
|          |        |        |        | gains   |         |         |
|          |        |        |        | updated |         |         |
|          |        |        |        | 11/17   |         |         |
+----------+--------+--------+--------+---------+---------+---------+
| **RXO**  | PRI    | PRI    | PRI    | PRI     | PRI     | PRI     |
|          |        |        |        |         |         |         |
|          | BU     | BU     | daily  | Daily   | Daily   | No      |
|          | random | random | bias   | Bias    | Bias    | daily   |
|          | e      | e      | -8 mS  | --5.5   | --3 mS  | bias    |
|          | nables | nables |        | mS      |         |         |
|          |        | daily  | +100   |         |         |         |
|          | daily  | bia    | mS     | -100 mS |         |         |
|          | bi     | s--7.0 | 3      | 31Aug04 |         |         |
|          | as+6.5 | mS     | 1Aug04 |         |         |         |
|          | mS     |        |        |         |         |         |
+----------+--------+--------+--------+---------+---------+---------+
| **CLOCK  | 2      | 2      | 2      | 2       | 2       | 2       |
| DIV**    |        |        |        |         |         |         |
+----------+--------+--------+--------+---------+---------+---------+
| **MIRP** | Ex     | Ex     | Ex     | E       | E       | E       |
|          | ternal | ternal | ternal | xternal | xternal | xternal |
|          | Synch  | Synch  | Synch  | Sync    | Sync    | Synch   |
|          |        |        | R      |         |         |         |
|          | R      | R      | ephase | Rephase | Rephase | Rephase |
|          | ephase | ephase | 0730   | each    | Enabled | Enabled |
|          | E      | each   | daily  | orbit   |         |         |
|          | nabled | orbit  |        |         |         |         |
+----------+--------+--------+--------+---------+---------+---------+
| **TIP    | 1      | 1      | 2      | 2       | 1       | 1       |
| SIDE**   |        |        | (since |         |         |         |
|          |        |        | 4      | since   | Analog  |         |
|          |        |        | /3/03) | 4/18/05 | telem   |         |
|          |        |        |        |         | d       |         |
|          |        |        | #2 has |         | rifting |         |
|          |        |        | 3      |         |         |         |
|          |        |        | chans  |         |         |         |
|          |        |        | inop   |         |         |         |
+----------+--------+--------+--------+---------+---------+---------+
| **Rec    | DTRs   | DTRs   | DTRs   | DTRs 1, | DTR     | SSRs    |
| orders** | 3A, 4, | 1, 2B, | 1, 2,  | 2, 3,   | 1,3,4 / | 1,      |
|          | 5B     | 5      | 3, 4   | 4A      | SSR 2   | 2,3,4,5 |
| **(DTR,  |        | Safe   | Saf    |         |         |         |
| SSR)**   | Saf    | state- | estate | Sa      | Safest  | Safes   |
|          | estate | 1B     | 1B EOT | festate | ate=SSR | tate=5B |
|          | 5B     |        |        | 3A      | 2B      |         |
|          |        |        |        |         |         | Current |
|          |        |        |        | 4B STIP |         | spikes  |
|          |        |        |        | only    |         |         |
|          |        |        |        |         |         | TOAR    |
|          |        |        |        |         |         | 450     |
+----------+--------+--------+--------+---------+---------+---------+
| **VTX**  | #1 ON  | OFF    | #1 OFF | I       | #2 ON   | #2 ON   |
|          |        | (no    |        | NOP/Off |         |         |
| (APT     | 137.50 | minal) | OFF    |         | 137.62  | 1       |
| data)    | MHZ    |        | 13Nov  | OFF     | MHZ     | 37.9125 |
|          |        | Since  | -13Dec | since   |         | MHZ     |
|          |        | 8/2/05 |        | 1       |         |         |
|          |        |        |        | 1/15/00 |         |         |
+----------+--------+--------+--------+---------+---------+---------+
| **BTX**  | #1     | #2     | #1     | #2      | ###     | #1      |
|          |        |        |        |         | #### #2 |         |
|          | 136.77 | 137.77 | 137.35 | 137.77  |         | 137.35  |
|          | MHZ    | MHZ    | MHZ    | MHZ     | 137.77  | MHZ     |
|          |        |        |        |         | MHZ     |         |
+----------+--------+--------+--------+---------+---------+---------+
| **STX**  | 1 --   | 3 --   | 2-Omni | 2 --    | 3 --    | 1 -     |
|          | HRPT;  | HRPT   | HRPT   | HRPT    | HRPT    | HRPT    |
| 1 = rcp  |        |        |        |         |         |         |
| 1698.0   | 2,3 -  | 2, 1   | 2      | 1--     | TOAR424 | 3 -     |
| mhz      | Pl     | --     | om     | P       | low     | P       |
|          | ayback | Pl     | ni=rcp | layback | power   | layback |
| 2 = lcp  |        | ayback |        |         |         |         |
| 1702.5   |        |        | Power  | 4 --    | 2 & 4   | 2-P     |
| mhz      |        |        | drop   | P       | P       | layback |
|          |        |        |        | layback | layback |         |
| 3= rcp   |        |        | TOAR   |         |         | 4-Test  |
| 1707.0   |        |        | 446    | & MCM   | 1-      | &       |
| mhz      |        |        |        | usage   | Standby | Standby |
|          |        |        | 4-Pl   |         |         |         |
| 4= rcp   |        |        | ayback | 3 low   | STX-1   |         |
| 2247.5   |        |        |        | power   | Power   |         |
| mhz      |        |        | 1,     | unused  | drop    |         |
|          |        |        | 2,3-De |         | TOAR    |         |
|          |        |        | graded |         | 443.    |         |
+----------+--------+--------+--------+---------+---------+---------+
| #        | [Ar    | [Array | [Array | [Array  | [Array  | [Array  |
| ## POWER | rayOff | Off    | Off    | Off     | Off.    | Off.    |
|          | +60]   | -50]   | -45]   | -4      | --4     | -4      |
| (Array   | {.unde | {.unde | {.unde | 0]{.und | 0]{.und | 0]{.und |
| offset   | rline} | rline} | rline} | erline} | erline} | erline} |
| and CANT |        |        |        |         |         |         |
| angle,   | since  | Batts  | Since  | Since   | Since   | [S]{.   |
| charge & | 6      | 1&3V   | 1      | 7/16/02 | 1/29/04 | underli |
| V/T      | /23/05 | /T=6/9 | /25/01 |         |         | ne}ince |
| rates,   |        |        |        | Eclipse | Eclipse | 6/6/05  |
| eclipse  | Full   | Batt2  | Full   | all     | all     |         |
| states   | Sun    | VT=7/9 | Sun    | year    | year    | Eclipse |
| and sun  |        |        |        |         |         | all     |
| angle)   | Sun    | Since  | Sun    | Sun     | Sun     | year    |
|          | Angle  | 11     | Angle  | Angle   | Angle   |         |
|          | 15 up  | /22/05 | 13     | 41      | at 68   | TOAR    |
|          | to 22  |        |        |         |         | 453 on  |
|          | in     | E      | Up to  | Start   | Steady  |         |
|          | early  | clipse | 15     | new     | trend   | Batt    |
|          | Jan    | all    | m      | uptrend |         | C/D     |
|          |        | year   | id-Dec |         | Batts   | ratio   |
|          | Batts  |        |        | Batts   | 1-3=    |         |
|          | 1      | Sun    | Batts  | 1-3=    | LRC     | Batts   |
|          | &2=LRC | angle  | 1-3=   | LRC     |         | 1-3=LRC |
|          |        | 49     | LRC    |         | V/T=    |         |
|          | Batt   |        |        | V/T=4/8 | 4/8     | Batts   |
|          | 1&2    | Steady | V      |         |         | 1-3     |
|          | V/T=4  | trend  | /T=7/9 | SA      | SA      | V/T=4/8 |
|          |        |        |        | CANT=22 | CANT=37 |         |
|          | Shunt  | Batts  | SA     | degs    | degs    | SADE -1 |
|          | de     | 1-3=   | C      |         |         | 7/29/05 |
|          | graded | LRC    | ANT=37 |         |         |         |
|          |        |        | degs   |         |         | SA      |
|          | SA     | De     |        |         |         | CANT=22 |
|          | C      | graded |        |         |         |         |
|          | ANT=37 | shunts |        |         |         |         |
|          | degs   |        |        |         |         |         |
|          |        | SA     |        |         |         |         |
|          |        | C      |        |         |         |         |
|          |        | ANT=22 |        |         |         |         |
|          |        | degs   |        |         |         |         |
+----------+--------+--------+--------+---------+---------+---------+
| *        | N      | E      | N      | V       | ###     | Nominal |
| *AVHRR** | ominal | rratic | ominal | ariable | Nominal |         |
|          |        |        |        |         |         | 3A-B    |
|          |        | Fr     | Rare   | No bar  | 3A-B    | switch  |
|          |        | equent | major  | codes   | switch  | D       |
|          |        | scan   | scan   | since   | enabled | isabled |
|          |        | motor  | motor  | 12 Oct. |         | 8/05/05 |
|          |        | c      | s      | Status  |         |         |
|          |        | urrent | urges. | u       |         | Channel |
|          |        | surge  | Last   | pgraded |         | 3B only |
|          |        |        |        | 1       |         |         |
|          |        | Occa   | In     | 0/18/05 |         |         |
|          |        | sional | cident |         |         |         |
|          |        | i      | 11     | TCE24   |         |         |
|          |        | magery | /18/04 | OFF     |         |         |
|          |        | bar    |        | 4/14/04 |         |         |
|          |        | codes  |        |         |         |         |
|          |        |        |        | Channel |         |         |
|          |        | Ch     |        | 3B      |         |         |
|          |        | annels |        | only.   |         |         |
|          |        | 2&4    |        |         |         |         |
|          |        | APT    |        |         |         |         |
+----------+--------+--------+--------+---------+---------+---------+
| **A      |        |        | Opera  | Oper    | O       | Nominal |
| MSU-A1** |        |        | tional | ational | FF/INOP |         |
|          |        |        |        |         |         | Full    |
|          |        |        | Ch14   | Primary | Since   | Scan    |
|          |        |        | inope  | PLLO    | 1       | mode    |
|          |        |        | rative | chans   | 0/30/03 |         |
|          |        |        |        | 9-14    |         |         |
|          |        |        | Ch11   | bias    | S       |         |
|          |        |        | inope  | shift.  | urvival |         |
|          |        |        | rative |         | heat    |         |
|          |        |        |        | Backup  | on.     |         |
|          |        |        |        | PLLO    |         |         |
|          |        |        |        | inop.   |         |         |
|          |        |        |        |         |         |         |
|          |        |        |        | Channel |         |         |
|          |        |        |        | 9-14    |         |         |
|          |        |        |        | noise   |         |         |
+----------+--------+--------+--------+---------+---------+---------+
| **A      |        |        | N      | Nominal | Nominal | Nominal |
| MSU-A2** |        |        | ominal |         |         |         |
|          |        |        |        | Space   |         | Full    |
|          |        |        |        | Pos     |         | scan    |
|          |        |        |        | ition-2 |         | mode    |
+----------+--------+--------+--------+---------+---------+---------+
| **       |        |        | Opera  | Oper    | Nominal | ***R    |
| AMSU-B** |        |        | tional | ational |         | eplaced |
|          |        |        |        |         |         | by      |
|          |        |        | Bias   | Space   |         | MHS***  |
|          |        |        | in All | Pos     |         |         |
|          |        |        | Chans. | ition-3 |         |         |
|          |        |        |        |         |         |         |
|          |        |        | Motor  | IPD     |         |         |
|          |        |        | surges | reports |         |         |
|          |        |        | most   | channel |         |         |
|          |        |        | recent | 8       |         |         |
|          |        |        | 11     | degr    |         |         |
|          |        |        | /14/04 | adation |         |         |
|          |        |        |        |         |         |         |
|          |        |        | de     |         |         |         |
|          |        |        | graded |         |         |         |
|          |        |        | data   |         |         |         |
|          |        |        | on     |         |         |         |
|          |        |        | Chan-3 |         |         |         |
|          |        |        | since  |         |         |         |
|          |        |        | 4/30   |         |         |         |
+----------+--------+--------+--------+---------+---------+---------+
| ### HIRS | OF     | N      | N      | Oper    | NOMINAL | ######  |
|          | F/Inop | OMINAL | OMINAL | ational |         | ## Oper |
|          |        |        |        |         | 1 Pixel | ational |
|          | Turned | Opera  | Yellow | Imagery | cross   |         |
|          | off    | tional | status | high    | track   | Status  |
|          | 6      |        |        | levels  | misal   | dow     |
|          | /23/05 | Occa   | Since  | radi    | ignment | ngraded |
|          |        | sional | 16 May | ometric | .       | to      |
|          | For    | loss   | 05     | noise   |         | Yellow  |
|          | power  | of     |        |         |         | 15 Aug  |
|          | b      | Fwheel | FW     | TOAR    |         | 05      |
|          | alance | synch  | Abrupt | 441     |         |         |
|          |        |        | return | CLOSED  |         | #####   |
|          | Filter |        | to     |         |         | ### LW  |
|          | Wheel  |        | n      | Occ     |         | channel |
|          | turned |        | ominal | asional |         |  1-12 n |
|          | OFF    |        | 7      | major   |         | oise TO |
|          | 10/    |        | /12/05 | FM      |         | AR 448  |
|          | 17/02. |        |        | surges, |         |         |
|          |        |        | FW     | most    |         | LW      |
|          |        |        | m      | recent  |         | Noise   |
|          |        |        | ode=Hi |         |         | i       |
|          |        |        | Powr   | 12/9/04 |         | mproved |
|          |        |        |        |         |         | since   |
|          |        |        |        |         |         | 14 Oct  |
+----------+--------+--------+--------+---------+---------+---------+
| ###      |        |        |        |         |         | Nominal |
|  MHS/MIU |        |        |        |         |         |         |
|          |        |        |        |         |         | Space   |
|          |        |        |        |         |         | View=0  |
|          |        |        |        |         |         |         |
|          |        |        |        |         |         | Invest  |
|          |        |        |        |         |         | igating |
|          |        |        |        |         |         | change  |
|          |        |        |        |         |         | in      |
|          |        |        |        |         |         | motor   |
|          |        |        |        |         |         | current |
|          |        |        |        |         |         | trend   |
+----------+--------+--------+--------+---------+---------+---------+
| **MSU**  | OF     | Opera  |        |         |         |         |
|          | F/Inop | tional |        |         |         |         |
|          |        |        |        |         |         |         |
|          | Turned | Scan   |        |         |         |         |
|          | off    | motor  |        |         |         |         |
|          | for    | and    |        |         |         |         |
|          | power  | a      |        |         |         |         |
|          | b      | ntenna |        |         |         |         |
|          | alance | pr     |        |         |         |         |
|          |        | oblems |        |         |         |         |
|          | 6      |        |        |         |         |         |
|          | /23/05 | End of |        |         |         |         |
|          |        | life   |        |         |         |         |
|          |        | test   |        |         |         |         |
|          |        | plans  |        |         |         |         |
|          |        | un     |        |         |         |         |
|          |        | derway |        |         |         |         |
+----------+--------+--------+--------+---------+---------+---------+
| **SSU**  |        | N      |        |         |         |         |
|          |        | ominal |        |         |         |         |
+----------+--------+--------+--------+---------+---------+---------+
| **DCS**  | N      | N      | N      | Nominal | Nominal | Nominal |
|          | ominal | ominal | ominal |         |         |         |
|          |        |        |        |         |         | DRU's   |
|          |        |        |        |         |         | 1-7 On  |
|          |        |        |        |         |         |         |
|          |        |        |        |         |         | DRU8    |
|          |        |        |        |         |         | off     |
|          |        |        |        |         |         |         |
|          |        |        |        |         |         | TOAR    |
|          |        |        |        |         |         | 449     |
+----------+--------+--------+--------+---------+---------+---------+
| **SARR** |        | N      | Opera  | Oper    | Nominal | Nominal |
|          |        | ominal | tional | ational |         |         |
|          |        |        |        |         | A-side  | A-Side  |
|          |        |        | A      | Mode    |         |         |
|          |        |        | -Side, | =AA     | All AGC | All AGC |
|          |        |        | AGC    |         | Mode    | Mode    |
|          |        |        | Mode   | A-side, |         |         |
|          |        |        |        | AGC     |         | Since   |
|          |        |        | Interm | Mode    |         | 15 Aug  |
|          |        |        | ittent |         |         | 05      |
|          |        |        | fa     | (B-side |         |         |
|          |        |        | ilures | in FG   |         |         |
|          |        |        | for    | mode)   |         |         |
|          |        |        | 243MHz |         |         |         |
|          |        |        | A&B    | 243 MHz |         |         |
|          |        |        |        | = INOP. |         |         |
+----------+--------+--------+--------+---------+---------+---------+
| **SARP** |        | OFF    | N      | Nominal | Nominal | Nominal |
|          |        |        | ominal |         |         |         |
|          |        | Power  |        | RCVR    |         | A-side  |
|          |        | F      | RCVR   | B/W = 2 |         | 23 May  |
|          |        | ailure | B/W =  |         |         |         |
|          |        |        | 2      |         |         |         |
+----------+--------+--------+--------+---------+---------+---------+
| **SEM**  | ON/N   | Opera  | N      | Nominal | Nominal | Nominal |
|          | ominal | tional | ominal |         |         |         |
|          |        |        |        | E-CDEM  | E-CDEM  | Turned  |
|          | Turned | El     | E      | -HVPS=5 | -HVPS=2 | on      |
|          | on     | ec-CH- | -CDEM- |         |         |         |
|          | 8      | HVPS=0 | HVPS=2 | P-CDEM  | P-CDEM  | 6 June  |
|          | /30/04 |        |        | -HVPS=4 | -HVPS=3 | at      |
|          |        | Pr     | P      |         |         | 14:05z  |
|          | El     | ot-CH- | -CDEM- |         |         |         |
|          | ec-CH- | HVPS=0 | HVPS=0 |         |         |         |
|          | HVPS=4 |        |        |         |         |         |
|          |        | 1 of 4 |        |         |         |         |
|          | Pr     | T      |        |         |         |         |
|          | ot-CH- | scopes |        |         |         |         |
|          | HVPS=0 | inop   |        |         |         |         |
|          |        |        |        |         |         |         |
|          | TED    | Auto   |        |         |         |         |
|          | l      | nomous |        |         |         |         |
|          | evel=3 | TED    |        |         |         |         |
|          | as of  | sh     |        |         |         |         |
|          | 27     | utdown |        |         |         |         |
|          | Sept   | 24     |        |         |         |         |
|          |        | Sept   |        |         |         |         |
+----------+--------+--------+--------+---------+---------+---------+
| **SBUV** |        | De     |        | Oper    | Nominal | Nominal |
|          |        | graded |        | ational |         |         |
|          |        |        |        |         | Anode   | Anode   |
|          |        | Grate  |        | D       | Mode    | mode    |
|          |        | motor  |        | egraded |         |         |
|          |        | sticks |        | Ozone   | Plan    | since 6 |
|          |        |        |        | data    | sweep   | July    |
|          |        | Flex   |        |         | mode    | 13:30z  |
|          |        | memory |        | Backup  |         |         |
|          |        | 3      |        | D       | S       |         |
|          |        | (giant |        | iffuser | tandard |         |
|          |        | step)  |        | inop    | Ops     |         |
|          |        | ops    |        |         | Pr      |         |
|          |        | sus    |        | Primary | ocedure |         |
|          |        | pended |        | D       | changes |         |
|          |        | 1      |        | iffuser |         |         |
|          |        | 2/2/03 |        | dep     | fort    |         |
|          |        |        |        | loyment | hcoming |         |
|          |        | R      |        | problem |         |         |
|          |        | educed |        | TOAR    |         |         |
|          |        | oper   |        | 426     |         |         |
|          |        | ations |        |         |         |         |
|          |        |        |        | AMSU    |         |         |
|          |        | Tra    |        | EMI     |         |         |
|          |        | nsient |        | causing |         |         |
|          |        | a      |        | erratic |         |         |
|          |        | nomaly |        | B       |         |         |
|          |        |        |        | ehavior |         |         |
|          |        | 1 Sept |        | in PMT  |         |         |
|          |        | 05     |        | cathod, |         |         |
|          |        |        |        | range 3 |         |         |
+----------+--------+--------+--------+---------+---------+---------+
| **       |        |        | N/A    | ON      | ON      | ON      |
| SADPOS** |        |        |        |         |         |         |
|          |        |        |        | Enabled | ENABLED | Enabled |
|          |        |        |        | MFa     |         |         |
|          |        |        |        | ctor50% | Timer = | Timer   |
|          |        |        |        |         | 12mins  | =12     |
|          |        |        |        | Timer = |         | mins    |
|          |        |        |        | 12 mins |         |         |
+----------+--------+--------+--------+---------+---------+---------+
| **T      | N      | N      | TCE26  | Nominal | TCE3H   | All     |
| HERMAL** | ominal | ominal | & 15H  |         | Batt 2A | TCE's   |
|          |        |        |        | TCE24   | heater  | active  |
| Heaters, | TCE's  |        | Telem  | OFF     | failed  |         |
| louvers  | back   |        | i      | 4/14    | ON,     |         |
|          | to     |        | nvalid | (AVHRR  | turned  |         |
| TCE's    | n      |        |        | H&L)    | off     |         |
|          | ominal |        | TOAR   |         | 8/26/03 |         |
|          | c      |        | 432    | HIRS    | TOAR    |         |
|          | onfigu |        |        | Filter  | 428     |         |
|          | ration |        | TCE2   | heater  |         |         |
|          | fol    |        | 4L&25L | turned  | CLOSED  |         |
|          | lowing |        | (HIRS  | OFF     | 9/14/04 |         |
|          | 7      |        | &      | 1/18/05 | no      |         |
|          | /25/04 |        | AVHRR) |         | cor     |         |
|          | U      |        | failed |         | rective |         |
|          | Vtrip. |        | 5      |         | action  |         |
|          |        |        | /13/98 |         | po      |         |
|          |        |        |        |         | ssible. |         |
|          |        |        | RCE    |         |         |         |
|          |        |        | ther   |         | AMSU-A1 |         |
|          |        |        | mostat |         | s       |         |
|          |        |        | failed |         | urvival |         |
|          |        |        | 5      |         | heaters |         |
|          |        |        | /13/98 |         | on      |         |
|          |        |        |        |         | 1       |         |
|          |        |        | T      |         | 0/29/03 |         |
|          |        |        | hermal |         |         |         |
|          |        |        | dow    |         |         |         |
|          |        |        | ntrend |         |         |         |
|          |        |        | ended  |         |         |         |
|          |        |        | 10 Oct |         |         |         |
+----------+--------+--------+--------+---------+---------+---------+
|          | *      | *      | *      | **N16** | **N17** | ### N18 |
|          | *N12** | *N14** | *N15** |         |         |         |
+----------+--------+--------+--------+---------+---------+---------+

**COMMENTS/CHANGES:**

NOAA-12: There were no changes to N12 during the past reporting period.

NOAA-14: The N14 AVHRR scan motor continues to experience frequent
current spikes that affect imagery primarily by causing

occasional bar codes on HRPT images. Synch delta is also highly variable
but does seem to benefit from the once per orbit rephase enable
operation that is executed out of stored commands over the South Pole
(illustration 1).

Power balance appears to have been optimized with the last solar array
offset move (to -50 degrees from -45) and battery V/T alterations that
occurred on 22 Nov. Previous to these reconfigurations, the batteries
were only reaching full charge with a 3-4 minute margin before entering
darkness. Furthermore, once the batteries did reach full charge, the
resultant shunt load increase was so significant that bus voltage
regulation appeared to be at risk. Since the reconfiguration, the
batteries reach full charge much earlier in the sunlit portion of the
orbit while concurrently shunt load has been significantly reduced to
the point that the bus voltage is once again within stable regulation
(illustrations 2-5). A "test" of the batteries capacity actually (albeit
inadvertently) occurred on 28 Nov when during a call up pass a non HRPT
STX transmitter was left on for an entire orbit. Previous to the 22 Nov
reconfiguration such a situation might have been cause for concern.
However, in this case, the battery voltage drawdown during eclipse
remained well above previous maximum draw downs. With the power balance
optimized, a prerequisite for the proposed MSU end of life "tilt test",
explained in previous weekly reports, has been accomplished. With this
power configuration and all power related issues staying the same, the
power subsystem is GO to support the tilt test if and when it is
approved by NOAA management. On the other hand, other than the
serendipitous outcome of the most recent EPS reconfiguration, no further
effort has gone into planning the MSU end of life "tilt test" on N14
that has been addressed in previous Weekly Reports.

NOAA-15: N15 VTX-1 (APT data) remains off because of an RF conflict with
N12 and will remain off until 13 Dec. Otherwise, all N15 subsystems were
nominal relative to recent performance during the past week. One item of
note was the AVHRR scan motor current which did surge approximately 8
mAmps on 28 Nov and has since stabilized within the same high low range
values but also at this higher absolute level. This situation has become
something of a pattern for this AVHRR in recent months where the scan
motor current quickly runs up then stabilizes at a new higher level and
then a week or so later, just as abruptly falls an equal amount and
stabilizes at the new lower level. These surges and drops are typically
[not]{.underline} accompanied by significant changes in component
temperatures, synch delta or image quality. See illustration 6 for a
view of the N15 AVHRR behavior, illustrations 7 and 8 for HIRS and AMSU
performance and illustration 9 for a depiction of N15's ADACS subsystem.

NOAA-16: The N16 AVHRR scan motor current was relatively stable and
unchanged during the past week at near nominal values

that are exclusive of bar coded imagery and MIRP rephase frame losses.
However, the scan motor current value still remains within the threshold
that wave patterns are still evident on extreme close-ups of HRPT
images. Thermally, the AVHRR components have also stabilized at their
all time high values reached last week but still well below the
threshold where TCE24 will have to be commanded back on. Other N16
payloads were also nominal and stable during the past week
(illustrations 10 and 11).

The N16 ADACS subsystem remained stable within improved values after the
uploaded of updated Rgyro roll estimation filter gains on 17 Nov into
the control CPU (only). With the improvement of N16 roll rates and
errors and Y-wheel motor currents and temperatures sustained over the
past 11 days it is expected that this update is a success and will be
made permanent by commanding it into the non-control CPU sometime this
week. Originally, the new gains were only installed on the control CPU
in case of instability. If the new gains had threatened attitude
performance, a switch of control to the backup CPU (which still had the
old gain values) would have maintained spacecraft attitude. See
illustration 12-14 for depictions of the sustained stability of N16 roll
axis performance.

NOAA-17: After experiencing and quickly recovering from an apparent
collision with an as yet undetermined space object on 20

Nov, just about every N17 component value returned to its pre-collision
equilibrium within 24-48 hours of the collision occurring. Two days
following this event, EMOSS engineers generated over 500 plots
encompassing all N17 subsystems and a very representative collection of
component values and determined that no apparent permanent effect had
occurred on any subsystem of this spacecraft because of this event. This
full system analysis was distributed as a power point document to a
large number of engineers who were part of the Tiger Team investigating
this event (and is available to anybody else upon request). The Tiger
Team convened on 22 Nov to try and determine the specific facts of the
event with engineers from NOAA, EMOSS, NASA, Lockheed and Air Force
Space Command in attendance. The analysis and conclusions from this
meeting were generally incorporated, along with additional EMOSS
analysis, into an Event Report (SER-05-P467) which included over 20 plot
attachments and was submitted by EMOSS to NOAA management on 28 Nov. The
text narrative of this report can be found on subsequent pages of this
report. Otherwise N17 was generally stable and nominal during the past
week with some slight instabilities showing up in the AVHRR scan motor
but nothing that has not been experienced on numerous previous
occasions. See illustrations 15 and 16 for payloads and illustrations 17
and 18 for ADACS analysis. Refer to the full Event Report or the TOAR
currently being generated by EMOSS engineers for a complete package of
graphical depictions of the collision event.

NOAA-18: In performing analysis on N18 NOAA engineers detected that the
MHS Flywheel Drive Motor which rotates

in the opposite direction of the MHS scanner to counter the angular
momentum of the scanner, has seen it motor current increase beginning on
or about 3 Nov while the scanner motor has remained stable (illustration
19). The MHS is presently in a thermal uptrend but no other value
measuring amperage on the MHS is showing any distinct trends at this
time. EMOSS engineers are not sure of the implication of this increase
but are watching it closely and coordinating with other MHS engineers to
make that determination. Otherwise N18 payload suite was nominal during
the past week (illustration 20).

The N18 Pitch Torquer coils are once again performing unloading after
going through a period of a couple of weeks where they were not needed
as the Z-momentum on N18 transitioned from a negative value to a
positive one while Reaction Wheel speed/direction went from positive
values to negative ones. This was reported on in the previous weekly
report but the transition now appears to have completed and stabilized
(illustration 21).

**NOAA/EMOSS Event Report** **SER-05-P467**

(Narrative extracts)

On, November 20 at 11:02z the on-duty AET saw miscompares on the
mnemonics BGYRXCON (X gyro consistency check failure), BRYCOIL (Roll-Yaw
torquer coil switched to back-up), and BRYCSINH (autonomous Roll-Yaw
coil switching inhibited). In addition, BZMOMENT (z axis momentum) was
flagging Red High and contacted engineering who arrived just before a
Barrow call up pass at 12:47z. The pass showed that the spacecraft
momentum and wheel speeds were abnormally high, but nominal ADACS
control mode was still selected.

Engineering began to assess the situation with the limited telemetry
available. The RY coil switch and the inhibiting of further switching
were the expected Flight Software response to reaction wheel speeds that
were too high after the end of a wheel unloading period. The gyro
inconsistency flag would be a good indicator of the time the anomaly
started but would not convey much other information.

Four possible causes for the anomaly were identified: 1) a collision
with a foreign object, 2) a gyro failure resulting in the reaction
wheels being driven by faulty data, 3) a RY coil failure that added
momentum, 4) a propellant leak that added momentum. It was decided to
enable thruster firing during the next pass if the RWA speeds looked too
high. Thrusters would be disabled at the end of the pass because of the
possibility of a faulty gyro. It was decided not to perform any other
commanding until data from the 14:43z pass could be analyzed.

At a 14:43z pass it was clear that the spacecraft was still in nominal
mode, that the coils were unloading the excess momentum

in the system, and that the spacecraft appeared to be healthy. The dump
data fixed the start of the anomaly at 10:31z at which point N17 was at
location; 58.042 South latitude, 167.786 West longitude and 827.9289 Km
altitude, south-east of New Zealand, moving toward the ascending node.
It was clear that a collision was the only one viable possibility.
Momentum jumped nearly simultaneously on all three axes, eliminating the
possibility of an RY coil anomaly. Propellant pressures showed no
changes, which ruled out a leak. Because the total momentum of the
spacecraft had changed, a gyro anomaly could also be ruled out.

Commanding was prepared for the 16:23z Wallops pass to restore the RY
coil to primary, to re-enable the autonomous coil switching, and to
clear the gyro inconsistency flag. The commands were sent with no
problems. The data at this pass and a call-up Barrow pass at 17:56z both
showed telemetry consistent with expectations.

With the spacecraft recovered to a nominal configuration and the
probable cause of the anomaly identified as a collision, telemetry data
were analyzed for signs of damage that the collision may have caused. No
single event upsets were recorded on either CPU for the entire day. The
only abnormalities noted in the telemetry seemed to be temporary
responses to the attitude anomaly, including an increase in RWA bearing
temperatures. Of particular concern was possible damage to the solar
array, since the large area is subject to a high probability of impact.
No changes in solar array performance were discernable.

The attitude errors induced by this large event were corrected by the
control system in about 13 minutes. The recovery took place without the
need for thruster firings. There was no evidence of RCE leaks. The coil
switching that took place was as per software design. The momentum
imparted in the collision was off loaded in about two revs, although it
took the rest of the day for the momentum profile to phase back to the
normal cycle.

The largest error was in yaw with an excursion over 10 deg. Yaw
exhibited a classic underdamped control behavior, evidenced by a
sawtooth pattern of yaw rate. The yaw reaction wheel speed and the
commanded torque in showed that the control torque was saturated for 3
cycles. Yaw reaction wheel speed was actually non-linear for several
seconds. Roll and pitch error were much less (1 deg in roll and less
than 0.2 in pitch).

Note that the momentum level telemetry (BXMOMENT, BYMOMENT, BZMOMENT)
can be misleading. The axis momentum levels are calculated in the
nitrogen gas unloading software as the sum of wheel and body angular
momenta read from the gyros. Weights are also applied to spacecraft body
rates relative to reaction wheel momentum.  The scale factors are 1.25
for yaw rate and 1.2 for pitch and roll body rates.  Thus, to accurately
measure the total external momentum imparted to the spacecraft by the
event, the net change in reaction wheel speed was used. Measurements of
the wheel speeds were taken between the onset of the impulse and the
point where the control system had damped out the error (approximately
13 minutes), and all the external momentum was stored in the wheels.
(Several minutes of magnetic coil torquing is neglected.) Differencing
the nominal wheel momentum accumulation profile over the same orbit
angles from the previous orbit gives a net momentum change due to the
event of (-77, +61, +20) in-lb-sec, and a total magnitude of 100.2
in-lb-sec. The sign of the momentum change is consistent with the
initial rate transients observed at the impulse.

Approximately 7 minutes after the impulse, the spacecraft entered the
southern E/W unloading region and the momentum began to unload . This
was the point where unload thresholds for yaw and roll RWA\'s were met.
The unloading was insufficient at the end of this region, however, and
the roll/yaw coil switched to backup because the X RWA speed was still
too high.\
\
Although November 20 is near the end of the Leonid meteor shower
timeframe, a Leonid impact is a clear possibility. Sources
[(http://lists.meteorobs.org/pipermail/meteorobs/2005-November/003520.html)](http://lists.meteorobs.org/pipermail/meteorobs/2005-November/003520.html)
show indications of increased Leonid activity in

the hours before the impact. To evaluate the likelihood of a Leonid
event, the NOAA-17 orbit geometry was modeled using STK-VO. The Leonid
radiant was visible (not occulted) at the time of the impact. Since the
impulsive torque vector is dependent on location of the impact from the
spacecraft center of mass and the orientation of the Force vector
(velocity), there is a plenum of trajectories that could generate the
observed disturbance. However, the large component in roll/yaw suggest
an impact on the solar array, which could occur either from the quadrant
of the Leonid radiant (Leonid impact), or along the velocity vector
(orbiting debris impact). Because the solar array position was
approximately 120 deg at the time of the anomaly, impact from either the
anti-velocity or anti-Leonid vector would occur on the back (non-cell
side) of the array.

To parameterize the mass of a possible impacting object very
approximately, the total angular momentum exchange (100 in-lb-sec) may
be resolved into linear momentum and related to an impulsive torque:

**N** = d**L**/dt

**N** dt = 100 in-lb-sec = 11.3 Nm-sec

(**R** x **F**) dt = 11.3 Nm-sec

\[**R** x (M d**V**/dt)\]dt = 11.3 Nm-sec

M \~ 11.3 / (**R** d**V**) kg

Varying effective moment arm between 1m (impact on the body) and 3m
(impact on the array), and velocity between 10 km/sec (representative
orbital debris relative velocity) and 70 km/sec (Leonid particle
velocity) gives the following particle mass parameterization:

  -------------- ------------------- ------------------- -----------------
  *Case*         *Moment Arm*        *Relative Velocity* *Particle Mass*
                 (**R**)             (**V**)             

  Orbiting       1m                  10 km/sec           1.1 gm
  debris; body                                           
  impact                                                 

  Orbiting       3m                  10 km/sec           375 mg
  debris; S/A                                            
  impact                                                 

  Leonid; body   1m                  70 km/sec           160 mg
  impact                                                 

  Leonid; S/A    3m                  70 km/sec           54 mg
  impact                                                 
  -------------- ------------------- ------------------- -----------------

Thus, the momentum exchange is consistent with impact of an orbiting
debris mass of 1 gram (order of magnitude), or a Leonid particle in the
50-100 mg range (a 2-sigma Leonid particle size distribution).

![](media/image1.png){width="8.25in" height="6.936805555555556in"}

**HRPT 29 Nov at 14:00z**

**Illustration 1: NOAA-14 AVHRR Health Analysis**

(The large current spikes continue affecting the scan motor. At times
the value is nominally within the 150 mAmps range. It just hasn't been
able to stabilize there. Imagery is sometimes bar coded and sometimes
nominal. It is probable that most nominal images are a result of the
MIRP rephases enable operations that are conducted once per orbit over
the South Pole rather than once per day as was previously the case.

![](media/image2.png){width="8.375in" height="6.436805555555556in"}

**Illustration 2: NOAA-14 EPS Health Analysis**

(The SA move and VT change on 22 Nov appears to have had the desired
affect of increasing battery voltages while decreasing shunt workload
and allowing better bus voltage regulation.)

![](media/image3.png){width="8.125in" height="6.241666666666666in"}

Illustration 2: N14 Power Analysis part 1

(The SA and VT change of 17 Nov appears to have not been effective at
reducing shunt stress. Depicted in this plot is the 12 hour period
immediately following the VT change.)

Illustration 3: N14 EPS Analysis (part 2)

(No problems in the battery thermal situation as a result of the VT
change either.)

![](media/image4.png){width="8.375in" height="6.309722222222222in"}

**[Before Array Move]{.underline}** **[After Array Move]{.underline}**

Illustration 4: N14 Power Analysis (Part 3)

(Much improved, nominal and stable for the first time in many weeks.)

![](media/image5.png){width="8.25in" height="6.338888888888889in"}

Illustration 5: N14 Power Analysis Long Term Effects

(A year in the life of N14 power performance with reconfigurations
depicting the effects on key power subsystem components.)

![](media/image6.png){width="8.25in" height="6.329861111111111in"}

Illustration 6: N15 AVHRR Analysis

(Scan motor current surging again but stabilized on JDAY 333. Synch
delta and thermal situation still look good imagery remains nominal.)

![](media/image7.png){width="8.25in" height="6.329861111111111in"}

Illustration 7: N15 HIRS Analysis

(Nominal and stable.)

![](media/image8.png){width="8.375in" height="6.159027777777778in"}

Illustration 8: N15 AMSU Analysis

(Like HIRS, nominal and stable)

![](media/image9.png){width="8.25in" height="6.329861111111111in"}

**ILLUSTRATION 9: N15 ADACS Analysis**

(Nominal and stable. Appear to be entering the seasonal effect of larger
Yaw increases which should continue for several weeks, as it does each
year at this time.)

![](media/image10.png){width="8.25in" height="6.3375in"}

**ILLUSTRATION 10: N16 AVHRR Analysis**

(About as nominal and stable as it has been in many months.)

![](media/image11.png){width="8.125in" height="6.5569444444444445in"}

**ILLUSTRATION 11: N16 AVHRR Imagery Analysis**

(Minor wave patterns persist but otherwise generally nominal imagery.)

![](media/image12.png){width="8.125in" height="6.241666666666666in"}

Illustration 12: N16 HIRS Analysis

(Generally stable but filter motor current recently equaled an all time
high. Something to watch.)

![](media/image13.png){width="8.25in" height="6.3375in"}

**\\**

Illustration 13: N16 ADACS Analysis (Part 1)

(No more saturation on the Y-Wheel motor current, everything maintained
nicely since the filter gain updates of 21 Nov.)

![](media/image14.png){width="8.25in" height="6.067361111111111in"}

Illustration 14: N16 ADACS Health Analysis (Part 2)

(Again very stable since the new gain updates went into effect.)

![](media/image15.png){width="8.25in" height="6.3381944444444445in"}

Illustration 15: N17 AMSU Health Analysis

(Nominal and stable, just like last week.)

![](media/image16.png){width="8.25in" height="6.418055555555555in"}

Illustration 16: N17 AVHRR Health Analysis

(Generally nominal and stable notwithstanding a little instability from
the scan motor current several days ago.)

![](media/image17.png){width="8.25in" height="6.418055555555555in"}

Illustration 17: N17 ADACS Analysis

(Put in perspective, the collision of 20 Nov seems to have been little
more than a bump in the road. Nominal and stable all week.)

![](media/image18.png){width="8.25in" height="6.418055555555555in"}

Illustration 18: N17 ADACS Health Analysis (Part 2)

(Everything returned quickly back to normal and there appear to be no
fuel leakage whatsoever.)

![](media/image19.png){width="8.375in" height="6.2652777777777775in"}

**[6 Month trends]{.underline}** **[2 Month History]{.underline}**

Illustration 19: N18 MHS Flywheel Motor Current Trend Change

(A distinct change to the flywheel current on 3 Nov. MHS is presently in
a thermal uptrend).

![](media/image20.png){width="8.25in" height="6.338888888888889in"}

Illustration 20: N18 Payload Motor Current Analysis

(Everything else looks nominal and stable.)

![](media/image21.png){width="8.375in" height="6.435416666666667in"}

Illustration 21: N18 ADACS Analysis

(Z-axis transition appears to be complete, Pitch coil once again being
used.)

# POLAR SPACECRAFT TIP CLOCK ERROR

## WEEK ENDING November 25, 2005

  ---------- ---------- ---------- ---------- ---------- ---------- ----------
  DAY/DATE   NOAA-12    NOAA-14    NOAA-15    NOAA-16    NOAA-17    NOAA-18

  FRI. 11/18 -892 msec  +276 msec  -345 msec  +346 msec  +173 msec  +121 msec

  SAT. 11/19 N/A        +274 msec  -345 msec  +349 msec  +173 msec  +120 msec

  SUN. 11/20 -903 msec  +275 msec  -345 msec  +349 msec  +174 msec  +122 msec

  MON. 11/21 -906 msec  +282 msec  -346 msec  +350 msec  +174 msec  +124 msec

  TUE. 11/22 -906 msec  +281 msec  -348 msec  +349 msec  +176 msec  +128 msec

  WED. 11/23 -903 msec  +281 msec  -349 msec  +352 msec  +177 msec  +129 msec

  THU. 11/24 -906 msec  +281 msec  -350 msec  +351 msec  +179 msec  +130 msec
  ---------- ---------- ---------- ---------- ---------- ---------- ----------