Oct_10_1999_M79.txt Shift M79
        Start at 1999:283:20:30:00 GMT
                = 1999 Oct 10  4:30pm EDT
        End       1999 Oct 10  7:00pm EDT

   
See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or 
/proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Oct_01_1999_M70.txt.



SOT Lead	Bill Podgorski
SOT SC/ACA	
FOT-SI		
HRC-SI          
ACIS-SI	
OTHER          

Plan: - Running P21b load, SHORT eclipse (OBA setpoint raised)


EVENTS							    DONE	OBSID
--------------						    ----	-----
Start Shift                                             283:2030         
----- Out of Contact ------
AOS DSS-54 (Madrid)                                     283:2130        62355
----- Real time------ DSS-54 (Madrid)
Chandra State at AOS was nominal
   (see note 1)
Eclipse start                                           283:2230
Eclipse end (see note 2)                                283:2309
LOS                                                     
End of shift                                            283:2350


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

1) Chandra's state at AOS was as follows:

UTC 1999:283:21:31:01 (Sun Oct 10)
OBT 1999:283:21:30:34   CTUVCDU  4585983   FMT2_NORM  OBC s/w NRML  OBC Errs   1
OBT       55978234.55   ONLVCDU  4585976
                                                      OBSID  62355  EPState  SUN
SIM TTpos  -99616   HETG Angle  81.3  PCADMODE NPNT   RA    97.697  Bus V  30.55
SIM FApos    -467   LETG Angle  81.3  PCONTROL NPNT   Dec  -50.700  Bus I  65.30
                                      AOFSTAR  GUID   Roll  79.485
ACA Object SSSSSSSS     Dither  ENAB                                HRC-I HV OFF
ACA ImFunc TTTTTNNN     Dith Yang  -1.72    Yaw Rate      0.01      HRC-S HV OFF
ACA CCD Temp  -10.4     Dith Zang  -7.99    Pitch Rate    0.24      OBSMode NEXT
ACA Int Time  1.698                         Roll Rate    -0.44      Door OP UNAC
AOACSTAT         OK     FSS SunAlfa  SUN                            Door CL UNAC
                        FSS Alfa   -0.30    Batt 1 SOC  100.00%
Avg HRMA Temp 70.61     FSS Beta   -0.16    Batt 2 SOC  100.00%
Avg OBA Temp  50.50     SA Resolv  89.97    Batt 3 SOC  100.00%  ACIS Stat7-0 66
OBA Tavg Fault NFLT     SA Sun Pres ILLM                         Cold Rad -120.7
OBA Trng Fault NFLT                                              Warm Rad  -82.0
HRMA power    83.50
OBA power     70.20                                              EPHIN Geom LARG
                                                                 INT cnt     121
Roll Mom.     5.203                                              P41GM cnt     0
Pitch Mom.   -1.319                                              A-Leak   0.1720
Yaw Mom.     17.148                                              B-Leak   0.0280


2) Eclipse performance was acceptable. The OBA temp went up to just above
   53 degrees (setpoint raised to 55 degrees). At LOS the OBA temp was
   about 52.8 degrees and slowly trending downward. The peak bus voltage
   reached was about 33 volts. The power draw characteristics of the OBA 
   were not exactly as expected and this issue must be understood so that
   future eclipse performance can be accurately predicted.