Oct_26_2000_M462.txt Shift M462
        Start at 2000:300:17:30:00 GMT
                = 2000 Oct 26  1:30pm EDT
        End       2000 Oct 26  6:30pm EDT

SOT shift report 2000-10-26 M462
   
See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or 
/proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Oct_26_2000_M462.txt


SOT Lead             Mark Freeman
SOT SC/ACA	    
FOT-SI              
HRC-SI  
ACIS-SI              Yousaf Butt, Bob Goeke, Catherine Grant, Mark Bautz
OTHER	             RJB, Mike Juda (Flight Director), Andy Northrup

Plan: - Running OCT2300C on ascending leg.  Finish OBSID 980, then begin
        OBSID 1561, 50 ksec observation of Sag A

ORBITAL EVENTS:

 2000:301:03:28:19.579    169    ORBIT APOGEE 
 2000:302:11:11:15.610    169    ORBIT PERIGEE
 2000:303:18:55:21.125    170    ORBIT APOGEE 
 2000:305:02:38:39.797    170    ORBIT PERIGEE
 2000:306:10:22:37.192    171    ORBIT APOGEE    
 2000:307:18:06:52.029    171    ORBIT PERIGEE
 2000:309:01:50:14.645    172    ORBIT APOGEE 
 2000:310:09:34:31.506    172    ORBIT PERIGEE

EVENTS                                                      DONE     OBSID
--------------                                              ----     -----
Start Shift                                             300:1730 
AOS (DSS-66)						300:1740       980
Status of S/C nominal (note 1) , however ACIS		300:1745      1561
  DPA-A was off unexpectedly     \
Loss of good telemetry on DSS-66  \			300:1930
Aquire telemetry (DSS-27)	   |(note 2)		300:2030
Begin upload of patches, etc.	  /			300:2115
Finish CAP 574                   /                      300:2150
LOS DSS-27						300:2225
End of shift						300:2255

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

1) Chandra snapshot at contact:

UTC 2000:300:17:42:01 (Oct26) f_ACE 3.77e+03 F_ACE 5.27e+07 Kp 1.7 R km 132787A
OBT 2000:300:17:41:40  CTUVCDU   968959  OBC s/w NRML  FMT2_EPS    CPEstat NORM
OBT       88969300.21  ONLVCDU   968944  OBC Errs   0
                                                     OBSID    980  EPState  SUN
SIM TTpos   92903  HETG Angle 79.84  PCADMODE NPNT   RA   180.130  Bus V  30.55
SIM FApos    -535  LETG Angle 78.34  PCONTROL NPNT   Dec  -78.166  Bus I  28.49
                                     AOFSTAR  GUID   Roll 146.807
ACA Object FFFSSSSS    Dither  ENAB                                HRC-I HV OFF
ACA ImFunc TTTTTTTT    Dith Yang  -5.20    Yaw Rate      0.07      HRC-S HV  ON
ACA CCD Temp  -10.4    Dith Zang   7.98    Pitch Rate    0.14      OBSMode NEXT
ACA Int Time  1.698                        Roll Rate    -0.10      Door OP UNAC
AOACSTAT         OK    FSS SunBeta  SUN                            Door CL UNAC
                       FSS Alfa   -0.34    Batt 1 SOC  100.00%
Avg HRMA Temp 70.61    FSS Beta   22.49    Batt 2 SOC  100.00%  ACIS Stat7-0 ff
Avg OBA Temp  51.21    SA Resolv  67.28    Batt 3 SOC  100.00%  Cold Rad -127.9
OBA Tavg Fault NFLT    SA Sun Pres ILLM                         Warm Rad  -82.0
OBA Trng Fault NFLT                        +Y SA Amps   13.72   RADMON     ENAB
HRMA power    89.70    SCS 128   ACT       -Y SA Amps   14.68   EPHIN Geom LARG
OBA power     24.70    SCS 129   ACT       +Y SA Temp  113.89   E150      154.6
                       SCS 130   ACT       -Y SA Temp  114.51   E300        2.1
Roll Mom.    -1.793                                             E1300       0.1
Pitch Mom.   -8.410   UpL Cmd Acc  18652   EPH A-Leak  0.9960   P4GM       31.7
Yaw Mom.     -1.428   Cmd Rej A      226   EPH B-Leak  0.1680   P41GM       0.1

2) Bob Goeke reported soon after real-time telemetry began that ACIS showed
   DPA-A to be in an unexpected power-off state.  No other unusual states
   were noted.  Appropriate ACIS team members were notified, as well as
   the Flight Director, and a team assembled.  After some discussion
   (while the SSR dump was taking place) it was decided that it would 
   be useful to command DPA-A back on.  

   At approx. 19:30 the command was sent; however, at that 
   point our telemetry stream from DSS-66 went bad, so ACIS was unable to
   determine the effect of the command or even see the command echo.

   DSS-66 was never able to regain solid telemetry, so support was ended at
   the original EOT time of 19:40.  OC requested some additional time on
   another dish, and we were given time on DSS-27.  With configuration time,
   and a reconfig for a lower downlink rate due to spotty data, solid
   telemetry was regained at approx. 300:2030 GMT.  After establishing that
   ACIS was in a reasonable state given the earlier commanding, the decision
   was made to upload appropriate code:

	SOP 61002	[DPA side A ON command only from this procedure]
	SOP 61083	Basic operating patches 
	SOP 61010	Start housekeeping run
	CAP 548		Reset ACIS FP Temperature (see note 3)
	CAP 574		Start science run (basic CTI SI mode)
   
   The result is that the current observation (OBSID 1561) will actually
   begin at ~300:2150 GMT, and will have a slightly different SI mode
   than in the load (S3 on rather than off is the major difference.) 

3) Note that the warm reboot of ACIS caused by running thru this set
   of procedures resulted in a FP temperature of -119C rather than the
   desired -120C, since there is an offset between setpoint and actual
   temperature.  CAP 548 sets the setpoint to -121C to achieve an actual
   FP temp. of -120C.