Sep_28_1999_H68.txt Shift H68
        Start at 1999:271:21:00:00 GMT
                = 1999 Sep 28  5:00pm EDT
        End       1999 Sep 28  8:00pm EDT

   
SOT Lead	Bill Podgorski
SOT SC/ACA	
FOT-SI		Eric Martin
HRC-SI          
ACIS-SI		Yousaf Butt, Catherine Grant
HETG            Kathy Flanagan

Plan: - Perform fine attitude initialization following safe mode
        recovery per CAP 456
      - Stop ACIS science data (complete CAP 458)
      - Insert HETG and move SIM posns to ACIS-S per CAP 459
      - Start ACIS-S/HETG observation 120 per CAP 457


EVENTS							    DONE	OBSID
--------------						    ----	-----
Start Shift                                             271:2100        62509
----- Real time------ DSS-27 (Goldstone)
Chandra State at start of shift
   (see note 1)
Executing CAP's 456 and 458
Complete CAP 456 (see note 2)                           271:2155
   (Fine attitude initialization)
Complete CAP 458                                        271:2157
   (Finish ACIS science run on cal source)
Complete CAP 459 (see note 3)                           271:2225
Start CAP 457 - ACIS-S/HETG Observation 120             271:2226          120
Change OBSID to 120                                     271:2232
Complete CAP 457                                        271:2235
End of shift                                            272:0000


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

1) Chandra configuration at 271:2100 was as follows:

       PCAD MODE              =       NSUN
       Stars:                 =          4  
       FIDS                   =          0 
       Format                 =          2
       OBSID                  =      62509
       SIM FA                 =       -535
       SIM TSC                =     -99608 (HRC-S)
       HETG                   =      OUT via pot reading
       LETG                   =      OUT via pot reading

       ACIS                   =  In data run on cal source
       HRC                    =  All HV OFF

2) CAP 456 performs fine attitude initialization from Normal Sun Mode.The
   final target position was:

       RA   =   16.0       deg
       DEC  =  -72.032222  deg
       ROLL =   11.7875    deg

   ACIS-S FID lights 2, 3 and 4 were turned on, but are not picked up
   until after the SIM is translated to ACIS-S in CAP 459.
       
   The initialization worked perfectly, with all 5 stars acquired. 

3) CAP 459 is a new CAP which moves the SIM in focus and translation 
   to one of 4 selected positions and also inserts or retracts a
   selected grating. Before the CAP was run we were at the HRC-S 
   position. After this CAP was run the HETG was in and the SIM TSC
   and FA were at the ACIS-S loacatons:

     SIM TSC    =    75615    (ACIS-S)
     SIM FA     =     -467
     HETGA      =        8.21 deg  (IN)
     HETGB      =        6.71 deg  (IN)
     LETGA      =       81.71 deg  (OUT)
     LETGB      =       79.83 deg  (OUT)

4) A question was raised about the length of ACIS-S/HETG observation (OBSID 120).
   It is supposed to be 165ksec. If it runs until stopped by the next load 
   it will be about 24 hours long, or 86400 sec instead of 165ksec. Kathy
   Flanagan will take this up with the mission planners.