Shift report A July 24 1999, 8am, MET 001:07:30, PET 000:22:15 Summary: No ACIS activities during this shift. ACIS is in the canonical thermal standby mode. The spacecraft is going through a dry run of IPS burn #1 which should occur on the next shift. Orbit is currently ~320 x 72,000 km. We are lower than nominal but still have the possibility to achieve 10,000 x 140,000 km. The FOT is considering several options to achieve the desired orbit. The most likely would involve delaying IPS burn #3 which would lengthen transfer orbit by 2.5 days. The least likely involves modifying IPS burn #1 from a demonstration burn into a rather long burn of 15 minutes. FOT is also preparing for an upcoming earth sensor scan. Issues: 1) The cold radiators appear to be stable at -127.9 C. The focal plane is at -118.9 C. The setpoint is -120.6 C. Do we have a problem ? Is it possible to achieve -120 C ? What about later in the mission ? Ellen ? 2) The pressure transducers read -0.7/3.1 on side A/B. Why is this ? Are the XDCRs inaccurate when cold ? 3) Does anything in the DEA HKP tell us if the focal plane heater is on ? Apparently not. 4) The EGSE TLM dropout issue is most likely a squirt problem. ACIS, HRC, and ACA should coordinate a request to the project to test Dan Leonard's patch. I can't push this, but Peter please work with Jon Chappel and Bill Podgorski and Dan Schwartz on this. 5) Bruce Twambly analyzed the first SSR dump data and reported that 0.09 % of the minor frames are missing. Is even this small of a data dropout a problem for ACIS ? I hope not. ACIS OPs Team Web Page Notes: 1) ACIS real time TLM page is up and running: "http://asc.harvard.edu/acis/home.html" Thanks Shanil ! Just a few corrections to make. 2) Shift reports are archived at "http://asc.harvard.edu/acis/ops_reports/shift.html" The Big Excitement: The big excitement of the shift was watching the radiator temperatures recover after a perigee passage. Unfortunately, we lost data during perigee when the radiators were heating up. Relevant temperature data from the shift: MET 000:23:45:00 == PET 000:14:27:00 == 205:04:16:00 Focal Plane was at -118.9 C, previous reading from several hrs ago. MET FP Temp 1CRAT 1CRBT 1WRAT 1WRBT 1CBAT 1CBBT 001:00:13:00 -118.9 -127.9 -127.9 -82.0 -82.0 -62.4 -59.9 001:01:13:00 -127.9 -127.9 -82.0 -82.0 -62.4 -59.9 001:02:13:00 -127.9 -127.9 -82.0 -82.0 -62.4 -59.9 001:03:13:00 -127.9 -127.9 -82.0 -82.0 -62.4 -59.9 001:04:13:00 -127.9 -127.9 -82.0 -82.0 -62.4 -59.9 001:05:13:00 -127.9 -127.9 -82.0 -82.0 -62.4 -59.9 Earth in FOV of Earth sensor 001:06:45:00 -127.9 -125.5 -82.0 -82.0 -62.4 -59.9 001:07:15:00 -125.5 -125.5 -82.0 -82.0 -62.4 -59.9 001:07:28:00 -123.1 -123.1 -82.0 -82.0 -62.4 -59.9 @10,000 km, 001:07:55:00 -123.1 -123.1 -82.0 -82.0 -62.4 -59.9 001:08:00:00 -117.0 -123.1 -123.1 -82.0 -82.0 -62.4 -59.9 @6500 km, 001:08:06:30 -116.8 -123.1 -123.1 -82.0 -79.6 -62.4 -59.9 lose data for perigee passage, perigee is 300 km regain data, @4000 km 001:08:57:00 -96.6 -96.6 -72.2 -69.7 -59.9 -59.9 @6500 km 001:09:05:00 -101.5 -99.0 -72.2 -72.2 -59.9 -59.9 @9500 km 001:09:15:00 -103.9 -103.9 -72.2 -72.2 -59.9 -59.9 @12000 km 001:09:24:00 -106.3 -106.3 -74.7 -74.7 -59.9 -59.9 @15500 km 001:09:38:00 -108.7 -108.7 -74.7 -74.7 -59.9 -59.9 @20000 km 001:09:55:00 -111.1 -111.1 -77.1 -77.1 -59.9 -59.9 @23000 km 001:10:12:00 -113.5 -113.5 -77.1 -77.1 -62.4 -59.9 @27000 km 001:10:32:00 -115.9 -113.5 -79.6 -79.6 -62.4 -59.9 ACIS: Paul Plucinsky HRC: Martin Zombeck, Adrian Roy SOT LEAD: Dan Schwartz ACA: Bill Podgorski EPHIN: Eric Martin