SOT Shift Report

Shift M164
Duration:	 3 Jan 2000 17:00 EST -  3 Jan 2000 19:00 EST
		 3 Jan 2000 22:00 GMT -  4 Jan 2000 00:00 GMT

SOT Lead:           Tom Aldcroft
Spacecraft/Aspect:  
FOT/Science Liason: 
HRC:                
ACIS:               

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

Plan
----
Come out of perigee and begin observations:

 00747        SGR 0526-66 2000:004:00:38:30.5  44.0 ACIS-S
 00775             DEM 71 2000:004:13:07:11.5  44.0 ACIS-S
 00835           NGC 3256 2000:005:01:51:14.4  29.0 ACIS-S

Events
------
23:20	AOS on DSS-46 expected
23:28	Reconfigure for comm at 296960 
23:37	Comm established but very spotty; re-sweeping
23:43	Switching to alternate TGC (?) at DSS-46
23:47	No joy, signal about -127 db (compared to -119 or -120 expected)
23:49	Configuring to 148480
23:53	Trying swapping to LGA-A
23:56	Success, signal is -116 db
23:59	Reconfigure to high data rate
24:00   Start playback
00:31   4 stars and 3 fids acquired

Notes/Issues/Problems
---------------------
- For obsid 747, star in slot 7 is "too bright", causing OBC to reject
  star.  This starts a cycle of acquisition and search which will continue
  throughout the observation.  Star is 7.3 mag, while bright limit is 7.73.
  Wasn't the ACQ ATS patched to prevent this?

- As noted above, there was difficulty establishing comm.  Swapping LGAs
  was successful.  The DOT shows comm being established on LGA-B, but
  this appears to be incorrect.  The graphical timeline shows no visibility
  for LGA-B at this time.

State
--------
       PCAD MODE              =       NPNT
       CONTROL LAW FLAG       =       NPNT
       Stars:                 =          5 
       FIDS                   =          0
       RA                     =       64.026 deg 
       DEC                    =      -55.795 deg
       ROLL                   =     323.658 deg
       Format                 =          2
       OBSID                  =      62240 (ACIS CTI)

       SIM FA                 =      -467
       SIM TSC                =    -99616 (HRC-S)
       HETG                   =        OUT (81.0 deg)
       LETG                   =        OUT (79 deg)
        HRC-S HV is ON 
        EPHIN:         A-Leak =   0.1680 mu-a
                       B-Leak =   0.0280 mu-a