To:sot_shift
from: Dan Schwartz
date: 01 Jun 00 , 12:00noon EDT
Subject: SOT shift report, Shift L314
--------
See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or 
/proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Jun_01_2000_L314.txt.

Shift L314. 
	Start at 153:12:00  GMT
		 = 08:00am    01 Jun EDT
	End	   12:00 noon 01 Jun
   
SOT Lead	DAS
Spac/Aspect	
FOT/Sci liason	
HRC		
ACIS 		

(Times will be given in GMT on day 153. In general
times are rough, not precise.)

PLAN
Continue running May2800c load. Finish observing 3C 351,
OBSID 435, with ACIS-S. Then do OBSID 939, ACIS-I of the unidentified
ASCA source AX J1510+0742, and OBSID 367 of the GRAVITATIONALLY LENSED QUASAR
Q1422+231 with ACIS-S. Subsequent observations will be ACIS-S/HETG, a
followup of the TOO for the black hole candidate RXTE J1550-564, OBSID
690, followed by CTI measurements surrounding perigee passage.

Next Comms:
         153:15:45 to 16:45
         154:00:20 to 02:20
         154:11:10 to 13:10
         154:22:00 to 23:00

EVENTS
Status at LOS, 153:08:59 was as follows:

       PCAD MODE              =       NMAN
       CONTROL LAW FLAG       =       NPNT
       Stars:                 =          0 
       FIDS                   =          3
       RA                     =    257.330 deg 
       DEC                    =     60.777 deg
       ROLL                   =    172.843 deg
       Format                 =          2
       OBSID                  =        435 (Slewing to 3C351)

       SIM FA                 =       -467
       SIM TSC                =      75623 (ACIS-S)
       HETG                   =        OUT (79.8 deg)
       LETG                   =        OUT (78.3 deg)
        HRC-S HV is ON 
        EPHIN:         A-Leak =  0.4160 mu-a
                       B-Leak =  0.0680 mu-a

15:47 AOS
Status at AOS, 153:15:49 was as follows:

       PCAD MODE              =       NPNT
       CONTROL LAW FLAG       =       NPNT
       Stars:                 =          5 
       FIDS                   =          3
       RA                     =    216.159 deg 
       DEC                    =     22.953 deg
       ROLL                   =    218.448 deg
       Format                 =          2
       OBSID                  =        367 (Q1422+231)

       SIM FA                 =       -467
       SIM TSC                =      75625 (ACIS-S)
       HETG                   =        OUT (79.8 deg)
       LETG                   =        OUT (78.3 deg)
        HRC-S HV is ON 
        EPHIN:         A-Leak =  0.4160 mu-a
                       B-Leak =  0.0680 mu-a
15:50 Descending through 122370 km
ACIS focal plane -119.7 deg C.

16:43 LOS
Status is essentially unchanged.

NOTES/ISSUES/PROBLEMS
From the 9am status meeting:
	3 good supports. Uploaded last segment of MAY2800c, load is
good through 156:20:00.
	26m automation test last night had some problems: At the high altitude
and 512 Kbps TM rate, we should have had TM dropouts but these were
not indicated. The VCDU header which was added was incorrect. The DSN
desktop computers couldn't process data at 256 kbps when we
switched. Commanding through the automation equipment did work
properly.
	New products for JUN0400 were circulated yesterday. Load
review at 1pm today. After JUN0400 load is approved, JUN1100 products
will be circulated (i.e., could be today). 
	A momentum auto-unloading event was performed by Chandra for
the first time during the interval 151:17:19:22 to
151:17:27:33. Momentum unloading had always been predicted and
performed via stored commands, so the auto-unload was unexpected. This was
near perigee, so a gravity gradient torque larger than we calculated is
suspected. Everything behaved properly, as designed.
	In the OCC, database and command servers, and the telemetry
data files, will be backed up tomorrow starting 9:30 am EDT. This is a
routine monthly backup.

-------------------------------------------------------
Dan Schwartz,	MS #3
das@head-cfa.harvard.edu  
phone: (617)495-7232    FAX:   (617)495-7356
cell phone: (617)512-5627   
pager: 800-759-8352 PIN 1636502
       or e-mail 1636502@skytel.com 
-------------------------------------------------------