To:sot_shift
from: Dan Schwartz
date: 31 May 00 , 12:00noon EDT
Subject: SOT shift report, Shift L313
--------
See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or 
/proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/May_31_2000_L313.txt.

Shift L313. 
	Start at 152:12:00  GMT
		 = 08:00am    31 May EDT
	End	   12:00 noon 31 May
   
SOT Lead	DAS
Spac/Aspect	
FOT/Sci liason	
HRC		
ACIS 		

(Times will be given in GMT on day 152. In general
times are rough, not precise.)

PLAN 
Continue running May2800c load. Finish observing PKS 2155-304,
OBSID 1704, with HRC-S/LETG. Then do OBSID 1705, ACIS-S/HETG of PKS
2155-304. Subsequent observations will be ACIS-S, OBSID 309 of M31,
OBSID 588 of the planetary nebula NGC 7027, and OBSID 435 of the
quasar 3C351 which has a high ionization absorber.

Next Comms:
         152:13:15 to 14:15
	 152:23:00 to 00:00
	 153:07:30 to 08:30
	 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, 152:07:14 was as follows:

       PCAD MODE              =       NPNT
       CONTROL LAW FLAG       =       NPNT
       Stars:                 =          5 
       FIDS                   =          3
       RA                     =    329.743 deg 
       DEC                    =    -30.216 deg
       ROLL                   =     97.625 deg
       Format                 =          2
       OBSID                  =       1703 (PKS2155-304)

       SIM FA                 =       -467
       SIM TSC                =      72439 (ACIS-S)
       HETG                   =        OUT (79.8 deg)
       LETG                   =         IN ( 4.5 deg)
        HRC-S HV is ON 
        EPHIN:         A-Leak =  0.4640 mu-a
                       B-Leak =  0.0760 mu-a

12:25 Ascending through 127379 km

13:16 AOS
Status at AOS, 152:13:26 was as follows:

       PCAD MODE              =       NPNT
       CONTROL LAW FLAG       =       NPNT
       Stars:                 =          5 
       FIDS                   =          3
       RA                     =    329.741 deg 
       DEC                    =    -30.237 deg
       ROLL                   =     96.614 deg
       Format                 =          1
       OBSID                  =       1704 (PKS2155-304)

       SIM FA                 =       -990
       SIM TSC                =     -99616 (HRC-S)
       HETG                   =        OUT (89.8 deg)
       LETG                   =         IN ( 4.5 deg)
        HRC-S HV is ON 
        EPHIN:         A-Leak =  0.4840 mu-a
                       B-Leak =  0.0760 mu-a

ACIS focal plane temperature is -119.7 deg C.

HRC rates, total ~180/sec; valid ~80/sec.

14:15 LOS
Ascending through  131864 km. 
Status essentially unchanged from AOS.

NOTES/ISSUES/PROBLEMS
Notes from 9am status meeting:
	Three good comm passes. Loads uplinked through 155:19:00; one
more segment to be uplinked to complete the MAY2800c load.
	Products for JUN0400 load out yesterday, first review today at
2pm. 
	OBC gave a non-fatal dump overflow error. This was due to
inability to find an acquisition and guide star in Obsid 62041, as
noted in M312 shift report yesterday. Each loss of track is reported
to the OBC as an error, and when too many errors accumulate the
counter overflows and gives the OBC overflow error. This is not an OBC
or spacecraft problem. It IS another manifestation of the star
acquisition problem which has been noted over the past ~6 weeks.
	At the 153:07:30 pass tomorrow morning, there will be an
end-to-end data flow test with the 26m DS-16 antenna. OCC will be in
dual string operation, with string 1 supporting the live pass and
string 2 the test. This has been coordinated with CXC DSops and
SOT/MTA, so that data will flow to psicorp and the pipelines, but will
not trigger MTA alarms.
	The monthly CAP for on-board ephemeris update is being prepared.

	 
-------------------------------------------------------
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 
-------------------------------------------------------