Roll Maneuver           1997/03/20-21   THURSDAY-FRIDAY, MARCH 20-21, (DOY
79/DOY 80) 
                                        ----------------------------------------------

                                        Beginning of 1 degree offpoint/trim in Normal Mode:  10:13:39 UT 
                                        from Nominal (+ 1.781) to the 1 degree OFFSET (+2.783) 

                                        End of 1 degree offpoint in Normal Mode: 11:10:47 UT 
                                        from Nominal (+ 1.781) to the 1 degree OFFSET (+2.783)

                                        NOTE: 
                                        In RMW mode from 079/12:00:59 to 080/03:46:40 =  ~ 15 hours 46 minutes
                                        3 hours 40 min at +90 position for SWAN

                                        Transition from Normal Mode to RMW Mode at 12:00:59 UT

                                        ROLL #1: Roll from OFFSET POSITION (2.783) to delta +30 degrees

                                        Command sent to start the slew: 12:24:00 UT
                                        Slew Start: 12:24:51 UT
                                        Slew Stop:  12:30:36 UT
                                        FDF value of Roll Angle:  +32.773

                                        ROLL #2: Roll from delta +30 to delta +60 degrees

                                        Command sent to start the slew: 13:01:59  UT
                                        Slew Start: 13:02:51 UT
                                        Slew Stop:  13:08:50 UT
                                        FDF value of Roll Angle: +62.771

                                        ROLL #3: Roll from delta +60 to delta +90 degrees

                                        Command sent to start the slew: 13:41:39 UT
                                        Slew Start: 13:42:33 UT 
                                        Slew Stop: 13:48:18 UT
                                        FDF value of Roll Angle: +92.789

                                        ROLL #4: Roll from delta +90 to delta +120 degrees

                                        Command sent to start the slew: 14:22:40 UT
                                        Slew Start: 14:23:31 UT
                                        Slew Stop: 14:29:31 UT
                                        FDF value of Roll Angle: 122.793 UT

                                        ROLL #5: Roll from delta +120 to delta +150 degrees

                                        Command sent to start the slew: 15:01:32 UT
                                        Slew Start: 15:02:14 UT
                                        Slew Stop: 15:08:14 UT
                                        FDF value of Roll Angle: +152.799

                                        ROLL #6: Roll from delta +150 to delta +180 degrees

                                        Command sent to start the slew: 15:39:31 UT
                                        Slew Start: 15:40:12 UT
                                        Slew Stop:  15:46:12 UT
                                        FDF value of Roll Angle: +182.799

                                        ROLL #7: Roll from delta +180 to delta +210 degrees

                                        Command sent to start the slew: 16:17:32 UT
                                        Slew Start: 16:18:26 UT
                                        Slew Stop:  16:24:10 UT
                                        FDF value of Roll Angle: +212.799

                                        ROLL #8: Roll from delta +210 to delta +240 degrees

                                        Command sent to start the slew: 16:55:37 UT
                                        Slew Start: 16:56:24 UT
                                        Slew Stop:  17:02:24 UT
                                        FDF value of Roll Angle: +243.010

                                        ROLL #9: Roll from delta +240 to delta +270 degrees

                                        Command sent to start the slew: 17:33:34 UT
                                        Slew Start: 17:34:22 UT
                                        Slew Stop:  17:40:22 UT
                                        FDF value of Roll Angle: +272.754

                                        ROLL #10: Roll from delta +270 to delta +300 degrees

                                        Command sent to start the slew: 18:12:51 UT
                                        Slew Start: 18:13:35 UT
                                        Slew Stop:  18:19:35 UT
                                        FDF value of Roll Angle: +302.741

                                        ROLL #11: Roll from delta +300 to delta +330 degrees

                                        Command sent to start the slew: 18:55:49 UT
                                        Slew Start: 18:56:33 UT
                                        Slew Stop:  19:02:32 UT
                                        FDF value of Roll Angle: 332.375

                                        ROLL #12: Roll from delta +330 to OFFSET position  

                                        Command sent to start the slew: 19:34:38 UT
                                        Slew Start: 19:35:31 UT
                                        Slew Stop:  19:41:16 UT
                                        FDF value of Roll Angle: 2.713

                                        At this point in the timeline, from the OFFSET position, we turned 
                                        the spacecraft in the counterclockwise (negative x direction) and
                                        go in steps (deltas) of 90 degrees.

                                        ROLL #13: Roll from OFFSET to delta of -90 degrees

                                        Command sent to start the slew: 20:19:21 UT
                                        Slew Start: 20:20:14 UT
                                        Slew Stop:  20:35:58 UT
                                        FDF value of Roll Angle: -87.229

                                        ROLL #14: Roll from delta -90 to delta -180 degrees

                                        Command sent to start the slew: 21:09:28 UT
                                        Slew Start: 21:10:12 UT
                                        Slew Stop:  21:25:56 UT
                                        FDF value of Roll Angle: -177.189

                                        ROLL #15: Roll from delta -180 to delta -270 degrees
                                        SWAN +90 degree roll)

                                        Command sent to start the slew: 21:56:58 UT
                                        Slew Start: 21:57:40 UT
                                        Slew Stop:  22:13:39 UT
                                        FDF value of Roll Angle: -267.118 

                                        ROLL #16: Roll back to nominal SoHO observing position

                                        Command sent to start the slew: 02:16:03 UT
                                        Slew Start: 02:16:58 UT
                                        Slew Stop:  02:33:00 UT
                                        FDF value of Roll Angle: + 1.949

                                        Command Sent to go from RMW to NM at:  03:46:40 UT.

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

                                        WHEEL SPEEDS AT VARIOUS TIMES (RECORDED) DURING THE ROLL FOR MDI TEAM 
                                        ( provided by Helmut Schweitzer, and Jean-Philippe Olive)
                                        ----------------------------------------------------------------------
                                        Please find hereafter a summary of the roll maneuver (about the wheels and
                                        with the roll angle). Notice that the time are not exactly the dwell
                                        starting time.
                                        Best regards.

                                        The times given are somewhere during the dwell, sometimes at the start of
                                        the dwell.

                                        Time    w1    w2    w3   Roll Degree
                                        -------------------------------------
                                        12:02  2565 -3103  1738  NM to RMW
                                        12:31  1728 -3088  2650  32.773
                                        13:10   592 -2250  2853  62.771
                                        13:50  -543  -805  2549  92.789
                                        14:30 -1370   853  1717 122.793
                                        15:10 -1658  2287   591 152.799
                                        15:49 -1349  3103  -533 182 799
                                        16:28  -506  3093 -1354 212.799
                                        17:12   629  2256 -1642 243.010
                                        17:58  1765   810 -1338 272.754
                                        18:22  2586  -847  -506 302.741
                                        19:04  2890 -2277   629 332.375
                                        19:59  2575 -3098  1754   2.713
                                        20:37  1770   810 -1327 -87.229
                                        21:27 -1333  3098  -517 -177.189
                                        22:15  -522  -805  2565 -267.118
                                        02:39  2613 -3087  1743    1.949   end of Roll