Nov_17_1999_H118.txt Shift H118
        Start at 1999:321:22:00:00 GMT
                = 1999 Nov 17  5:00pm EST
        End       1999 Nov 18  1:00am EST

   
See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or 
/proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Nov_17_1999_H118.txt.



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

Plan: - Running P26b, observe Leonid peak in real time

EVENTS							    DONE	OBSID
--------------						    ----	-----
Start Shift                                             321:2200         1479
Out of contact at start of shift
AOS DSS-24 (Goldstone)                                  321:2325         1479
State at AOS was nominal (see notes 2 and 3)
Leonid peak                                             322:0230 (approx)
(see note 4)
LOS                                                     322:0438
End of shift                                            322:0500





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

1) No observed effect of Leonids in this COMM period. 

2) Chandra's state at AOS 321:2325 was:

       PCAD MODE              =       NPNT
       CONTROL LAW FLAG       =       NPNT
       Stars:                 =          5
       FIDS                   =          3
       RA                     = 333.276184 deg
       DEC                    = -22.166423 deg
       ROLL                   = -68.401362 deg
       Format                 =          2
       OBSID                  =       1479
       SIM FA                 =       -535 
       SIM TSC                =      92903 (ACIS-I)
       HETGA                  =      80.58 deg (OUT)
       HETGB                  =      81.33 deg (OUT)
       LETGA                  =      80.21 deg (OUT)
       LETGB                  =      79.08 deg (OUT)
       EPHIN A-leak           =     0.3400
             B-leak           =     0.0520

       ACIS                   =      Nominal
       HRC                    =      Nominal


                                 
3) An OBC Fixed Overflow error was noted at AOS.  Flight software was contacted 
   and indicated that the error was due to a roll-over of the variable GS_LOSS_COUNT. 
   This variable counts guide star re-acquisition tries. This made sense since
   the error occurred at 231:2115 GMT during an observation in which one of
   the guide stars was not being tracked. There was a problem in the error
   log, however, in that the fault location pointed to was not the variable
   address, but an address somewhere in SCS 130. This will be looked into.

4) Leonid data can be found at:  http://www.leonidstorm.com/graphics/user_03_10D.gif