Long Term Stability of FGS1r in Transfer Mode

Details Long Term Stability of FGS1r in Transfer Mode Long Term Stability of FGS1r in Transfer Mode

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8833n&link_type=abstract

HST Proposal ID #8833

Physics

Hst Proposal Id #8833

Scientific paper

This proposal monitors the temporal stabilty of the FGSr1 S-curves. During its first 1.5 years onboard HST FGS1r demonstrated evolution of its S-curves, both in fringe visibility {amplitude} and fringe morphology. By June of 1998 the fringes appeared to have stabilized. The articulated mirror assembly, or AMA, was adjusted in Sept. 1998 to re-optimize the instrument's interferometric response. The S-curves were monitored for the remainder of cycles 7 and 8. Remarkably, no changes larger that typical "observational noise" {induced by spacecraft jitter} have been seen in either the X or Y axis S-curves since September 1998. Until now the monitoring of FGS1r was carried out by periodically observing the standard star UPGREN69 at the center of the FGS1r FOV in Transfer mode with both the F583W filter and the 2/3 PUPIL stop. This proposal marks a departure from that approach. Four standard stars of different B-V colors from the FGS1r Transfer Mode calibration library will be observed once each. Each of these stars has been observed by FGS1r during cycle 8. These data will verify the continued temporal stabilty of the S-curves but will do so, for the first time, over a variety of spectral colors. And as in the past, several secondary calibrations will also be achieved. These include lateral color, Trans-Pos bias, and the F583W/F5ND cross filter effects for Position Mode observing.

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