To:sot_shift
from: Dan Schwartz
date: 04 Dec 01, 12:00noon EST
Subject: SOT shift report 2001-12-04 L866
--------
See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or 
/proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Dec_04_2001_L866.txt.

Shift L866. 
	Start at 338:13:00  GMT
		 = 08:00am    04 Dec EST
	End	   12:00 noon 04 Dec
   
SOT Lead	DAS
(Times will be given in GMT on day 338.)

PLAN
----
Running load DEC0401B, the replan for recovery from the ephin hardware
flag trigger of SCS 107. Science observations will resume at 16:55,
with the nearby neutron star RX J0720.4-3125, obsid 2774, then the
VELA pulsar wind nebula, obsid 2815, and another look at RX
J0720.4-3125, obsid 2773. All are ACIS-S.

Next Comms:
 338:1530 to 1630
 339:0045 to 0245
 339:1130 to 1330
 339:2015 to 2215
 340:0245 to 0345
 340:1300 to 1400
 340:2020 to 2205
 341:0500 to 0600
 341:1400 to 1500 
 342:0050 to 0150
 342:0750 to 0850
 342:1530 to 1630
 343:0200 to 0300
 343:1015 to 1115
 343:1945 to 2045

Orbital events:
 2001:339:18:05:54.482    322   ORBIT APOGEE 
 2001:341:01:51:06.084    322   ORBIT PERIGEE
 2001:342:09:34:21.745    323   ORBIT APOGEE 
 2001:343:17:18:29.578    323   ORBIT PERIGEE
 2001:345:01:02:06.663    324   ORBIT APOGEE 
 2001:346:08:45:35.747    324   ORBIT PERIGEE
 2001:347:16:29:41.033    325   ORBIT APOGEE 
 2001:349:00:13:59.971    325   ORBIT PERIGEE
 2001:350:07:57:35.026    326   ORBIT APOGEE

EVENTS
------
Status at 338:08:40, during the last pass, was as follows:
       PCAD MODE              =       NPNT
       CONTROL LAW FLAG       =       NPNT
       Stars:                 =          5 
       FIDS                   =          0
       RA                     =    254.425 deg 
       Dec                    =     35.332 deg
       ROLL                   =    353.285 deg
       Format                 =          2
       OBSID                  =      61396 
       SIM FA                 =       -535
       SIM TSC                =     -99616 (HRC-S)
       HETG                   =        OUT (79.46 deg)
       LETG                   =         IN ( 4.46 deg)
        HRC-S HV is ON 
       EPHIN Geom             =       LARG
             E1300            =        0.0           LT 10.0 (RADMON is
             P4GM             =        0.2           LT 300. disabled)
             P41GM            =        0.0           LT 8.47
             A-leak           =     1.0200 mu-a
             B-leak           =     0.3680 mu-a
Descending through 31008 km. ACIS focal plane temperature -119.9. 

At LOS, 338:08:57, we had entered into normal maneuver mode to get to
a favorable attitude for earth occultation. 

Status at AOS, 338:15:30, was as follows:
       PCAD MODE              =       NPNT
       CONTROL LAW FLAG       =       NPNT
       Stars:                 =          8 
       FIDS                   =          0
       RA                     =    107.002 deg 
       Dec                    =    -57.829 deg
       ROLL                   =     33.195 deg
       Format                 =          2
       OBSID                  =      61394 
       SIM FA                 =       -535
       SIM TSC                =     -99616 (HRC-S)
       HETG                   =        OUT (79.46 deg)
       LETG                   =         IN ( 4.46 deg)
        HRC-S HV is ON 
       EPHIN Geom             =       LARG
             E1300            =        0.0           LT 10.0 (RADMON is
             P4GM             =        0.3           LT 300. disabled)
             P41GM            =        0.0           LT 8.47
             A-leak           =     1.0200 mu-a
             B-leak           =     0.5280 mu-a
Ascending through 57888 km. ACIS focal plane temperature -119.9. 

16:28 Enter normal maneuver mode and RADMON enable, as expected.
16:32 All stars have been lost. OBSID changed to 2774.

16:35 LOS. Maneuver in progress. Ascending through 65248km. ACIS focal
plane temperature is -119.9.

NOTES/ISSUES/PROBLEMS
As reported in the previous SOT shift report 2001-12-03 M865, we have
successfully resumed normal operations, subsequent to running CAP 771
to reset the EPHIN hardware failure flag in OBC memory. The root cause
remains a subject of ongoing engineering investigation.

From the 9am status meeting:
	We have uplinked the first three segments of
DEC01401B. Onboard loads are good through 341:09:07.  
	An initial email review of DEC1001 was conducted. Subsequently
a TOO for a gamma ray burst has caused a rescheduling of at least the
first orbit. Products are expected out no later than tomorrow morning
for a load review at 2pm tomorrow.
	

Quick look data:
No new data, due to the EPHIN hardware failure flag anomaly.

-------------------------------------------------------
Dan Schwartz,	MS #3
das@head-cfa.harvard.edu  
phone: (617)495-7232    FAX:   (617)495-7356
cell phone: (617)512-5627   
pager: 877-693-7198 PIN 693-7198
       or e-mail 6937198@archwireless.net
-------------------------------------------------------