Sep_10_1999_H51.txt Shift H51
        Start at 1999:254:07:00:00 GMT
                = 1999 Sep 11 03:00am EDT
        End       1999 Sep 11 06:00am EDT

   
SOT Lead	Bill Podgorski/Mike Juda
SOT SC/ACA
FOT-SI		
HRC-SI          
ACIS-SI		Yousef Butt, Fred Baganoff, Shanil Virani


Status/Plans:
------------
  - Run ACIS diagnostics per CAPs 408 and 409, P12d load having been
    terminated earlier at 253:1950



      
EVENTS							    DONE	OBSID
--------------						    ----	-----
Start Shift                                             254:0700        62403
----- Out of Contact------
AOS DSS-24                                              254:0718
----- Real time------ 
Confirm configuration                                   254:0720
Start CAP 408, ACIS Diagnostics at FP = -110C           254:0723
ACIS stop science previous run                          254:0728
Change OBSID to 62402                                   254:0728        62402
ACIS Start science, CAP step 3                          254:0732
   (1000s Event Histogram on S array, FP at -110C)
ACIS Stop science                                       254:0804
Change OBSID to 62401                                   254:0809        62401
ACIS Start Science, CAP 408 step 10                     254:0810  
   (2000s timed exposure of S2 and S3, faint)
Start CAP 409. ACIS diagnostics +/-5V at FP=-110C       254:0816
Complete upload of CAP 409 command loads                254:0828
ACIS Stop Science, step 2 CAP 409                       254:0917
Enable +/- 5V command loads
Change OBSID to 62400                                   254:0928        62400
Power all video boards, step 11 CAP 409                 254:0930
ACIS start science                                      254:0935
   (Short timed exposure to verify configuration)      
ACIS Stop science (SCS 191)                             254:0949
ACIS Stop science (SCS 191)                             254:0950
Re-start ACIS science                                   254:0950
Stop ACIS science (SCS 191)                             254:0956
Stop ACIS science (SCS 191)                             254:0957
Change OBSID to 62430                                   254:1001        62430
   (Faint timed exposure on S2 and S3)
ACIS start science (SCS 190)                            254:1005
ACIS stop science (SCS 191)                             254:1118
Change OBSID to 62429                                   254:1119        62429
Enable EvtHist,spect w/ bias                            254:1124
ACIS start science (SCS 190)                            254:1125
unexpected LOS                                          254:1134
AOS                                                     254:1136
LOS DSS-24                                              254:1156
----- Out of Contact------


NOTES/ISSUES/PROBLEMS 
--------------------- 

1) At AOS the spacecraft configuration was nominal. It was in NPM
   with OBSID = 62403. The SIM TSC was at -99608 and the FA at -835.
   There were 5 stars observed and NO FIDs , since during last ACQ
   the FIDS locs had not been updated in the on-board catalog as
   move to HRC-S was made. Attitude was:
 
        RA:    201.371142
        DEC: -  42.995246
        ROLL: -139.416411

   Format was 2.


2) Problem with reading housekeeping data on 62400 required two science runs.

3) At 11:34 LOS as we hit limits on the the antena - AOS at 11:36
after reset but could not continue commanding. At the time we were
clearing out the mission SCS slots used during CAP 409; SCSs 136, 137,
151, 159, 187, 190, 191, 207, and 233 are still enabled. Since
command link was lost, we could not turn off the transmitter and just
followed it to the "dirt".