nereus.020.log

Asteroid 4660 Nereus

2002 January 20

Updated: 2008 March 19

=========================================================

Schedule and SNR Calculation

                                                    Duration  Rotation
Jan      UTC         PST     RA   Dec  AU    RunSNR    (h)      (&deg;)    
15    1730-2205   0930-1405  321  -1  0.036    100    4.58      109
18    1645-0005   0845-1605  308  -6  0.031    170    7.33      175
19    1630-2335   0830-1535  303  -8  0.030    190    7.08      169
20    1635-2300   0835-1500  298 -10  0.029    200    6.42      153
22    1530-2005   0730-1205  286 -13  0.029    210    4.58      109
23    1505-1950   0705-1150  280 -15  0.029    200    4.75      113
24    1445-1730   0645-0930  274 -16  0.030    190    2.75       66
25    1425-1855   0625-1055  268 -17  0.031    170    4.50      107
26    1405-1915   0605-1115  263 -18  0.032    150    5.17      123
27    1345-1910   0545-1110  258 -19  0.033    120    5.42      129
29    1315-1830   0515-1030  250 -20  0.037     88    5.25      125

=========================================================

UNCERTAINTIES
  With 282 optical observations spanning 30-SEP-1981 to 4-JAN-2002
5 delay and 2 Doppler, 4660 Nereus solution #30 was computed. 3-sigma
X-band uncertainties are shown below. Files have been updated
at Goldstone and Arecibo.

   Note TPM prediction error is one of the uncalibrated error 
sources not included in these uncertainty predictions. This is why 
Doppler error is sometimes replaced by "<1.000" Hz when it gets
very small. Here I left it.

      DATE          Pointing  X-band Dop     Delay  
                      (")         Hz         (sec)  
-----------------  ---------  ----------  ----------
 8-JAN-2002 00:00      1.331       0.178    0.000040
10-JAN-2002 00:00      1.157       0.130    0.000012
12-JAN-2002 00:00      1.084       0.124    0.000004
14-JAN-2002 00:00      1.227       0.133    0.000013
16-JAN-2002 00:00      1.385       0.157    0.000027
18-JAN-2002 00:00      1.540       0.194    0.000045
20-JAN-2002 00:00      1.654       0.240    0.000066
22-JAN-2002 00:00      1.691       0.283    0.000089
24-JAN-2002 00:00      1.647       0.315    0.000110
26-JAN-2002 00:00      1.536       0.330    0.000127
28-JAN-2002 00:00      1.408       0.328    0.000138

=========================================================

Pointing macro for January 20
                                                  TX Offsets    
Date (UTC)   DOY  hhmmss    RA      Dec   Macro  LHA      Dec    RTT  OSOD      
2002 01 20   020  160000 298.4875 -9.3671   A                    29.5  26
2002 01 20   020  170000 298.2369 -9.4463   A   0.0021  -0.0006  29.5
2002 01 20   020  180000 297.9825 -9.5249   AB                   29.5
2002 01 20   020  190000 297.7256 -9.6027    BC 0.0021  -0.0007  29.5
2002 01 20   020  200000 297.4673 -9.6798    BC                  29.4
2002 01 20   020  210000 297.2089 -9.7561     C 0.0021  -0.0006  29.4
2002 01 20   020  220000 296.9518 -9.8315     C                  29.4
2002 01 20   020  230000 296.6970 -9.9063     C                  29.4

PRDX.OUT.s36
TRANSMITTER: STATION #14,     RECEIVER: STATION #14
RECEIVER    U.T.         RANGE         DOPPLER      LHA      DEC      RA      EL     
 2002 JAN 20 16:30     29.5318912180    78879.095 312.1218  -9.4066 298.363  26.388 
 2002 JAN 20 16:40     29.5263934702    77984.754 314.6704  -9.4198 298.321  28.052 
 2002 JAN 20 16:50     29.5209594918    77059.762 317.2192  -9.4330 298.279  29.669 
 2002 JAN 20 17:00     29.5155913837    76105.493 319.7681  -9.4462 298.237  31.234 
 2002 JAN 20 17:10     29.5102911480    75123.380 322.3171  -9.4593 298.195  32.742 
 2002 JAN 20 17:20     29.5050606845    74114.909 324.8662  -9.4724 298.153  34.189 
 2002 JAN 20 17:30     29.4999017871    73081.623 327.4154  -9.4855 298.110  35.570 
 2002 JAN 20 17:40     29.4948161398    72025.108 329.9647  -9.4986 298.068  36.878 
 2002 JAN 20 17:50     29.4898053137    70947.002 332.5141  -9.5117 298.025  38.109 
 2002 JAN 20 18:00     29.4848707635    69848.983 335.0635  -9.5248 297.983  39.257 
 2002 JAN 20 18:10     29.4800138252    68732.768 337.6130  -9.5378 297.940  40.315 
 2002 JAN 20 18:20     29.4752357126    67600.113 340.1626  -9.5508 297.897  41.278 
 2002 JAN 20 18:30     29.4705375160    66452.803 342.7123  -9.5638 297.854  42.139 
 2002 JAN 20 18:40     29.4659201989    65292.655 345.2620  -9.5768 297.812  42.893 
 2002 JAN 20 18:50     29.4613845968    64121.511 347.8117  -9.5897 297.769  43.535 
 2002 JAN 20 19:00     29.4569314153    62941.233 350.3615  -9.6026 297.726  44.060 
 2002 JAN 20 19:10     29.4525612287    61753.703 352.9114  -9.6155 297.683  44.463 
 2002 JAN 20 19:20     29.4482744791    60560.816 355.4612  -9.6284 297.640  44.742 
 2002 JAN 20 19:30     29.4440714752    59364.479 358.0111  -9.6413 297.597  44.894 
 2002 JAN 20 19:40     29.4399523917    58166.603   0.5610  -9.6541 297.554  44.917 
 2002 JAN 20 19:50     29.4359172694    56969.105   3.1110  -9.6669 297.510  44.811 
 2002 JAN 20 20:00     29.4319660148    55773.899   5.6609  -9.6797 297.467  44.578 
 2002 JAN 20 20:10     29.4280984002    54582.895   8.2108  -9.6925 297.424  44.220 
 2002 JAN 20 20:20     29.4243140644    53397.993  10.7608  -9.7052 297.381  43.738 
 2002 JAN 20 20:30     29.4206125134    52221.082  13.3107  -9.7180 297.338  43.138 
 2002 JAN 20 20:40     29.4169931212    51054.035  15.8606  -9.7307 297.295  42.423 
 2002 JAN 20 20:50     29.4134551317    49898.703  18.4105  -9.7433 297.252  41.599 
 2002 JAN 20 21:00     29.4099976594    48756.915  20.9603  -9.7560 297.209  40.671 
 2002 JAN 20 21:10     29.4066196914    47630.473  23.5102  -9.7686 297.166  39.646 
 2002 JAN 20 21:20     29.4033200902    46521.146  26.0599  -9.7812 297.123  38.529 
 2002 JAN 20 21:30     29.4000975948    45430.670  28.6097  -9.7938 297.080  37.326 
 2002 JAN 20 21:40     29.3969508243    44360.743  31.1594  -9.8064 297.037  36.043 
 2002 JAN 20 21:50     29.3938782800    43313.022  33.7090  -9.8189 296.995  34.686 
 2002 JAN 20 22:00     29.3908783486    42289.118  36.2586  -9.8314 296.952  33.261 
 2002 JAN 20 22:10     29.3879493059    41290.594  38.8081  -9.8439 296.909  31.772 
 2002 JAN 20 22:20     29.3850893190    40318.965  41.3575  -9.8564 296.867  30.224 
 2002 JAN 20 22:30     29.3822964519    39375.688  43.9069  -9.8689 296.824  28.623 
 2002 JAN 20 22:40     29.3795686672    38462.166  46.4561  -9.8813 296.782  26.973 
 2002 JAN 20 22:50     29.3769038325    37579.742  49.0053  -9.8938 296.739  25.277 
 2002 JAN 20 23:00     29.3742997226    36729.695  51.5544  -9.9062 296.697  23.540 

=========================================================

BEGIN ELECTRONIC LOG

Benner at JPL
Ostro, & Giorgini at home
Kern, Franck, and Choate at Goldstone



Start with solution 36

TX Power =  xxx kW 

 TX  polarization             RCP
 RCV polarization             1=RCP=SC=  K at zenith   K on point at 1739 UTC
                              2=LCP=OC=  K at zenith   K on point

Boresight source: 1741-038  (elevation = 48 deg, azimuth = 157 deg)
Corrections:
AX = +10 mdeg
EL =  -1 mdeg

Starting CW setup:
TX polarization           RCP
RCV polarization          LCP
Frequencies:              2
Dwell:                    10 seconds 
Bandwidth:                2000 Hz
Sampling interval:        5000 x 0.1 usec  
VME FFT for PSD files:    4096 for 0.48828-Hz resolution

I called out on several occasions from home.  The first call was about
30 minutes after the tx window opened.  We were on tx RCP run 6 at that
time.  We did 10 cw runs tx RCP and then 10 tx LCP.  After that there
was a delay of about 15 minutes when they had trouble with the ACSM
while loading macro B.  Then there was a problem with the subreflector:
it wouldn't respond.  They did five resets and even sent someone upstairs
before it got going again.  That cost us roughly 45 minutes.

Carl estimated that the cw echoes are about 3 Hz wide and that they're
well centered on 0 Hz.  Bodes well...

We had a minor problem with the cw observations: they loaded solution
36 in the POs but solution 34 in the vme.  The major affect on the vme
is the RTT so the Dopplers should be fine.  That was my mistake:
when Carl asked me which solution to use I told him 34; I thought (from memory)
that was the one that I generated last night.  


1.0 us x 3.0 Hz setup
---------------------
(code=127, FFT=64, single-pol'n) 
_______________________________________________________________________
 Setup        Baud        RP         1-acc 1-acc      
            usec   m      usec        band   res    acc  band     res 
JX1XS010   1.000  150     127.0     7874.0 123.0     41   192     3.0 
txoff = +30 Hz (= +10 Doppler bins or bin 32+10=42)
loopback should be in gate 13.

The 1.0 us echoes came in right on the loopback range gate.


1/8 us x 1/8 Hz
---------------
(code=127, FFT=256, single-pol'n) 
 Setup        Baud        RP         1-acc 1-acc      
            usec   m      usec        band   res    acc  band     res 
JX1XS001   0.125   18.75   15.875  62992.1 246.1   1970    32     0.1249
txoff = +8 Hz
CLT = gate 34

*******************************************************************************
2008 March 19: We used acc = 1968 and res = 0.1250, not the values stated above
*******************************************************************************


The real time displays obtained at 1950 and 2029 show the LE at gates 20 and
21, so range drift appears to be small today.  Both echoes are somewhat asymmetric
with more power evident at negative frequencies than at positive frequencies.
There's an intriguing bright spot at positive freqs in the latter image.


2049: Spoke with Al.  They're on vax file #7, run 41.  They're going to stop 
at about run 50, transfer the vax files, and then resume imaging.  I'll check 
the files to verify that they're OK.  

2108: Carl has transferred vax files 1-7 to intruder. 
Let's convert the files to rdfs and make sure they're ok. 
Echo in file ne02007 is about 20 gates deep.  The echoes are very strong.

I'm transferring them to JPL.  I've already transferred the CW files.

Meanwhile, burn cds with files from the first three tracks + Arecibo data.

2137: files ne02006 and ne02007 look fine.
cds are done.

2146: Got another fax from 2141.  Echo is asymmetric but now most of the
power is at positive frequencies.  LE is in gate 24 so it looks like the
echo has drifted in range by about 4 gates in the last two hours.  It's
also possible that the shape might be causing the LE to appear to drift.

2150: spoke with Al.  Going well.  No problems with the ACSM when they
loaded macro C.  

2218: Al sent 2 more faxes.  They started file 10 at about 2210.  That should
be the last imaging file of the track barring unforseen problems.

2312: Spoke with Al.  End of the track went very well.  I posted a movie
showing 8 images from files 6-7 and I mentioned that to Al.

faxes: last display, hand-written log
transfer: vax files, log files



---------------------------------------------------------------------------

 DELAY (weight in 10^-6 sec):
  1937 12 02 19:50:00    R 42.590780605 10.000 8560.D6  -14      Reber,G.
  yyyy mm dd HH:MM:SS type obsrvbl(sec) weight frq(Hz) xstn rstn observer...


 DOPPLER (weight in Hertz)  :
  1937 11 27 22:20:00    P -540576.10D0 1.0000 8560.D6  -14  -13 Reber,G.
  yyyy mm dd HH:MM:SS type obsrvabl(Hz) weight frq(Hz) xstn rstn observer...

===================================================================================================

MASTERLOG
===================================================================================================
                                             RCV      
file         setup                  runs start -stop    osod    OFFSET    TX Poln    
---------------------------------------------------------------------------------------------------
PSD02020RCP.4660_Nereus, VOLT02020RCP.4660_Nereus
          CW 2 kHz 4096 FFT          10  170554-171544   36       none     RCP
PSD02020LCP.4660_Nereus, VOLT02020LCP.4660_Nereus
          CW 2 kHz 4096 FFT          10  171819-172809   36       none     RCP
ne02003      1 us x 3.0 Hz  127 code  5  174647-175136   36       +30      RCP      
ne02006    1/8 us x 1/8 Hz  127 code 52  185417-195234   36        +8      RCP         
ne02007    1/8 us x 1/8 Hz  127 code 50  200137-205722   36        +8      RCP         
ne02008    1/8 us x 1/8 Hz  127 code 50  211421-221014   36        +8      RCP        
ne02009    1/8 us x 1/8 Hz  127 code 42  221236-225949   36        +8      RCP    

===================================================================================================

ASTROMETRY
==========



===================================================================================================

PROBLEMS
========
1. acsm hung when we loaded macro B
2. subreflector stopped tracking for a while.  Had to restart it several times
   before it worked.  


Things to do after the track
============================
1. ftp cw data from the VME -> intruder            	==> done
2. scp cw data from intruder -> JPL                     ==> done
3. write protect cw data on reason                      ==> done
3. ftp ranging data from the VAX -> intruder            ==> done 
4. convert vax *.dat files to rdf files			==> done 
5  scp rdf ranging data from intruder -> JPL 	        ==> done 
6. write protect ranging data on reason   		==> done 
7. ftp tx/rcv logs to intruder                          ==> 
8. scp tx/rcv logs from intruder to JPL	                ==> 
9. write protect tx/rcv, ops, & cal log files at JPL    ==> 
10.update planning page w/astrometry        		==> 
11.draft a log file for the next track			==> 
12.critique 						==> 
13.get the data package				        ==> 
14.back up the data -> exabyte tape & write protect it	==> 
15.organize hardcopies in the notebook 			==> 
16.scp observational log -> JPL and write protect it	==> 
17.e-mail brief summary of results -> co-authors        ==> 
18.e-mail brief summary -> Ralph & Larry                ==> 
19.do a preliminary reduction of the cw data            ==> 
20.reduce the imaging data                              ==> done 
21.scp new orbital solutions from intruder -> JPL       ==> 
22.Contact optical observers (Pravec, Hicks, Buie...)	==> 
23.draft an imaging script for the next track		==> 
24.update the masterlog                                 ==> done