SOT Shift Report Shift M104 Duration: 4 Nov 1999 14:00 EST - 4 Nov 1999 17:30 EST 4 Nov 1999 19:00 GMT - 4 Nov 1999 22:30 GMT SOT Lead: Tom Aldcroft Spacecraft/Aspect: FOT/Science Liason: HRC: ACIS: ======================================== Plan ---- Continue with load P24, observing Coma Cluster, then on to MKN 421. Events ------ 21:13 AOS on DSS-27 22:10 LOS Notes/Issues/Problems --------------------- No problems at this time. Eric Martin mentioned that yesterday Chandra transitioned from NMM to NPM over 600 arcsec short of the expected maneuver end. This is due to choosing the wrong ATS to perform a SIM translation, one which includes a transition to NPM. Fortunately the PCAD flight software handled the situation well: first it refused to transition because of rate and attitude error monitors; finally when a transition was allowed, the software actually used the attitude error information to adjust the acquisition star angles, thus allowing a successful acquisition. (The code to do this was in place in preparation for super-dither operation). And so another check will be added to the backstop program. Snapshot -------- UTC 1999:308:21:31:01 (Thu Nov 4) OBT 1999:308:21:30:35 CTUVCDU 13015251 OBC s/w NRML FMT2_SSR CPEstat NORM OBT 58138235.14 ONLVCDU 13015248 OBC Errs 0 OBSID 1112 EPState SUN SIM TTpos 93303 HETG Angle 81.0 PCADMODE NPNT RA 194.944 Bus V 30.71 SIM FApos -535 LETG Angle 79.5 PCONTROL NPNT Dec 27.943 Bus I 27.98 AOFSTAR GUID Roll 31.753 ACA Object FFFSSSSS Dither ENAB HRC-I HV OFF ACA ImFunc TTTTTTTT Dith Yang 7.74 Yaw Rate 0.11 HRC-S HV ON ACA CCD Temp -10.4 Dith Zang 7.55 Pitch Rate 0.18 OBSMode NEXT ACA Int Time 1.698 Roll Rate 0.25 Door OP UNAC AOACSTAT OK FSS SunBeta SUN Door CL UNAC FSS Alfa -0.21 Batt 1 SOC 100.00% Avg HRMA Temp 70.61 FSS Beta 40.19 Batt 2 SOC 100.00% ACIS Stat7-0 64 Avg OBA Temp 50.97 SA Resolv 49.59 Batt 3 SOC 100.00% Cold Rad -120.7 OBA Tavg Fault NFLT SA Sun Pres ILLM Warm Rad -82.0 OBA Trng Fault NFLT +Y SA Amps 12.76 HRMA power 0.00 -Y SA Amps 13.91 EPHIN Geom LARG OBA power 97.50 +Y SA Temp 114.20 E1300 cnt 1 -Y SA Temp 114.51 P4GM cnt 0 Roll Mom. -4.966 P41GM cnt 0 Pitch Mom. 8.254 A-Leak 0.1560 Yaw Mom. -7.768 B-Leak 0.0240