SOT Shift Report Shift L46 Duration: 5 Sep 1999 06:00 EDT - 5 Sep 1999 14:00 EDT 5 Sep 1999 10:00 GMT - 5 Sep 1999 18:00 GMT SOT Lead: Tom Aldcroft Spacecraft/Aspect: FOT/Science Liason: HRC: ACIS: ======================================== Plan ---- Run under load P11 HRC-S off-axis effective area Continue running ACIS event histograms Events ------ - Start shift in comm. Running Obsid 157 (HRC-S Off-axis eff. area) G21.5-0.9, 5 stars and 2 fid lights. - ACIS dataTeEvHist window is scrolling 12:15 LOS 16:00 AOS 16:00 Obsid 147 in progress, with 3 fids and 5 stars 16:16 Obsid 62392 begins: maneuver to intermediate slew attitude 16:44 All 5 stars acquired at intermediate attitude 16:52 Obsid 173 begins: maneuver to Cas A 17:14 Acquired 5 stars and 3 fids at Cas A 17:22 HRC observation started Notes/Issues/Problems --------------------- Fid light current for 11, 12, 14 is 2.5 mA, and 0.0 mA for 13. DOT (FIDSEL ATS) indicates that 11, 13, and 14 were commanded on. DOT (ACQ ATS) indicates that 11, 13, and 14 were searched for. ACA shows fids 11 (slot 0) and 14 (slot 2) were acquired. Fid 13 (slot 1) was NOT acquired. This is a different behavior than Bill reported in the M44 shift report: > 4) FLCA telemetry: We noticed in observation 1299 that although we had > commanded FIDS 11, 13 and 14 ON (HRC-S FIDS 1, 3 and 4) we saw > currents reported for FID lights 11, 12 and 14 (MSID's AFLC11AI, > AFLC12AI, AFLC13AI and AFLC14AI). We did find the 3 FID light images > in the expected loctions for FIDS 11, 13 and 14, so we suspect a > telemetry database problem, perhaps an intercahnge of the light 12 and > 13 current telemetry. We have submitted an OPR for this. However, for the next observation (obsid 147), fid light 13 (slot 1) was correctly acquired, with exactly the same search parameters. It is unclear to me why we failed to acquire the fid for obsid 157. For P11, Dan had commented in a shift report that the small SIM offset had not been scheduled. I just noticed, however, that the offset WAS applied to the fid light positions for obsid 1153. That observation was done out of com and I don't see the dump data yet, but I expect that no fids will be found. The commanded search positions were offset in Z by about 200 arcsecs.