Summary
Obs 5688 was a difficult obsid to schedule for ACA, and even with hand editing the final catalog was near the limits of acceptability from the ACA review perspective.
We now have the observation data in house and it confirms that this catalog is really about as far as we want to push. Most of the observation was spent on three kalman stars, with a brief period where the OBC was dropping to two kalman stars. The roll bias noise and PCAD attitude error were substantially higher than normal, due to stars dropping in and out of use by the OBC. The good news is that the subsequent maneuver had a nominal one-shot error.
One disturbing issue to note is that the final two guide stars were predicted to have mags 10.40 and 10.56. Both of these are well within the ACA capability. In fact they turned out to be 11.3 and 11.1 mags, respectively.
Data and Plots
The science aspect solution required reprocessing and will use only three stars. With those three stars the solution will still meet requirements but will be poor by our standards.
OBSID: 5688 AXJ1426.9+2334 ACIS-S SIM Z offset: 0 Grating: NONE RA, Dec, Roll (deg): 216.748592 23.586964 142.991060 Dither: ON Y_amp= 8.0 Z_amp= 8.0 Y_period=1000.0 Z_period= 707.1 BACKSTOP GUIDE_SUMM OR MANVR DOT MAKE_STARS MP_TARGQUAT at 2005:100:18:43:16.322 (VCDU count = 12689231) Q1,Q2,Q3,Q4: 0.23105556 -0.90140255 -0.23374392 0.28186973 MANVR: Angle= 28.29 deg Duration= 1013 sec Slew err= 30.7 arcsec MP_STARCAT at 2005:100:18:43:17.965 (VCDU count = 12689237) ---------------------------------------------------------------------------------------- IDX SLOT ID TYPE SZ MINMAG MAG MAXMAG YANG ZANG DIM RES HALFW NOTES ---------------------------------------------------------------------------------------- [ 1] 0 2 FID 8x8 5.797 7.000 8.000 -755 -1727 1 1 25 [ 2] 1 4 FID 8x8 5.797 7.000 8.000 2158 181 1 1 25 [ 3] 2 5 FID 8x8 5.797 7.000 8.000 -1808 175 1 1 25 [ 4] 3 263192752 BOT 6x6 5.797 10.063 11.562 1304 566 20 1 120 a3g3 [ 5] 4 263198168 BOT 6x6 5.797 8.813 10.312 -2140 2310 16 1 100 [ 6] 5 263199776 BOT 6x6 5.797 10.130 12.312 -1297 694 20 1 120 a3g3 [ 7] 6 263201496 BOT 6x6 5.797 10.403 12.625 1101 -733 20 1 120 a3g4 [ 8] 7 263198776 BOT 6x6 5.797 10.563 12.125 2002 654 20 1 120 a3g4 [ 9] 0 263198808 ACQ 6x6 5.797 10.678 12.188 -542 413 20 1 120 a3 [10] 1 263194336 ACQ 8x8 5.797 10.776 12.281 93 -54 20 1 120 a3 [11] 2 263192848 ACQ 8x8 5.797 10.415 11.922 56 -1103 20 1 120 aX >> WARNING: Search spoiler. [ 7]- 263198816: Y,Z,Radial,Mag seps: 60 122 136 -0.1 >> WARNING: Magnitude. [10]: 10.776 >> WARNING: Readout Size. [10]: 8x8 Should be 6x6 >> WARNING: Readout Size. [11]: 8x8 Should be 6x6 >> WARNING: Magnitude. [ 7]: 10.403 >> WARNING: Magnitude. [ 8]: 10.563 >> WARNING: Magnitude. [ 9]: 10.678 >> WARNING: Magnitude. [11]: 10.415 Acquisition Figure of Merit : -5.06 Acquisition Stars Expected : 5.82
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Last modified:12/27/13
