To:sot_shift from: Dan Schwartz date: 25 Jan 00 , 12:00noon EST Subject: SOT shift report, Shift L186 -------- See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Jan_25_2000_L186.txt. Shift L186. Start at 025:13:00 GMT = 08:00am 25 Jan EST End 12:00 noon 25 Jan SOT Lead DAS Spac/Aspect FOT/Sci liason HRC ACIS (Times will be given in GMT on day 025. In general times are rough, not precise.) PLAN Continue running load JAN2300b. Finish OBSID 1519, ACIS-I observation of the globular cluster NGC 5139. Then do OBSID 921, the compact group of galaxies HCG 62, and OBSID 877, the radio quiet quasar BRI 1033-0327, both with ACIS-S. Next Comms: 025:14:10 to 15:35 025:21:45 to 00:00 026:05:00 to 07:00 026:14:05 to 15:45 026:22:00 to 00:00 EVENTS Status at LOS, 025:07:58, was as follows: PCAD MODE = NPNT CONTROL LAW FLAG = NPNT Stars: = 5 FIDS = 3 RA = 201.702 deg DEC = -47.500 deg ROLL = 66.008 deg Format = 2 OBSID = 1519 (NGC 5139) SIM FA = -535 SIM TSC = 92903 (ACIS-I) HETG = OUT (80.6 deg) LETG = OUT (79.1 deg) HRC-I HV is ON EPHIN: A-Leak = 0.4080 mu-a B-Leak = 0.0640 mu-a Ascending through 106377 km. 14:11 AOS Status essentially unchanged: EPHIN: A-Leak = 0.4200 mu-a B-Leak = 0.0640 mu-a Ascending through 128222 km. 15:35 LOS Status unchanged. See snapshot 824 at http://asc.harvard.edu/%7erac/snap/snap.cgi NOTES/ISSUES/PROBLEMS Notes from 9am status meeting. FOT/MP are now packaging loads into 36 hour blocks, instead of 24 hours, so that the three on-board command slots can store farther into the future. Products for Jan3000 load are delayed, expected out today so review will be scheduled for tomorrow. It was discovered that the SOT planning week of Sunday to Sunday had been interpreted by the FOT as starting at the midnight between Sunday and Monday (which is how the electronic DSN schedules are composed), while the SOT long term schedule generation started at 12:01am on Sunday morning and assumed observations were scheduled all day Sunday. This is a non-trivial issue to resolve, due to a need to either re-run the SOT long-term schedule, or to hand-edit the DSN schedules to redefine them to the Sat/Sun midnight boundary. Bill Davis' study of the clock correlation residuals has led to the discovery of a 20km error in our CHARACTERISTICS data base position for the locations of DSN stations, due to the difference between geocentric and geodetic coordinates. Application of this will reduce the residuals to a smoothly varying pattern of less than 50 microseconds maximum deviation. At 4pm today there will be a telecon to brief the CAP for the continuous dither uplink. Time: January 25th 4:00PM EST Phone: 1-888-456-3856 Pass Code: 54408 As part of the final testing of the OFLS rev 8, we will conduct full scale reviews of loads NOV2899 and P24 and P25, as generated by OFLS 8. This requires full support from SOT MP, instrument teams, and aspect, as if they were real loads. Schedule is TBD, but note that Paul Levitt notified us of the availability of the NOV28_R8 products in his email of 21 Jan. Note that the schedules generated will not be identical to the original ones, due to improvements in OFLS 8. This review is required before we will be allowed to use OFLS 8. Another gyro current glitch occured at roughly 22 hrs (UT) on day 024. Current went from ~111ma to 102ma, with accompanying changes in the pitch and yaw bias. Those bias changes have settled out, so that we should be fine for our next maneuver at ~1715. ------------------------------------------------------- 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 -------------------------------------------------------