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Chapter 13
FGS Data Analysis

In This Chapter...

 Analyzing Individual Observations / 13-1
Plate Overlays / 13-3
Resolving Structure with TRANSFER Mode / 13-5

Observers can analyze FGS astrometry data at various levels. Individual observations can be of interest when a particular star shows large, unexpected residuals. More frequently observers will be constructing plate overlays from sets of POSITION mode observations to determine parallaxes, proper motions, and reflex motions. Alternatively, analysis of TRANSFER mode observations can reveal an object's spatial structure at milliarcsecond scales. This chapter discusses the tools that will soon become publicly available to support these diverse astrometric investigations with the FGS.

Unlike the case for HST's other science instruments, STSDAS/IRAF does not currently provide tools supporting FGS astrometry. However, extensive and sophisticated software for analyzing both POSITION mode and TRANSFER mode datasets does reside at STScI. Most of this software was provided to STScI by the Space Telescope Astrometry Science Team (STAT) at the University of Texas and Lowell Observatory. Efforts are underway at STScI to make these tools available through the IRAF/STSDAS environment. Check the STScI FGS web pages for updates.


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