As a scientific instrument, the FGSs are capable of providing photometric measurements of point sources. The basic photometric capabilities of the FGS are:
- 40Hz 1-2% long-term relative photometry.
- 40Hz milli-magnitude relative photometry over orbital timescales.
The absolute FGS photometric response of FGS3 has been stable at the 2% level over the past eight years (L. Reed, BF Goodrich) . FGS1r is expected to be as stable or better. For relative photometry on time scales of orbits, the FGS has been shown to be stable at the 1 milli-magnitude level, thus affording an opportunity for 0.1-0.2% time series photometry.
For more specific details on FGS photometry, follow the links to the documents listed below.
FGS Photometry Documentation:
Instrument Science Reports:
ISRs are technical reports written by members of the FGS Group about various aspects of the instrument and data. They usually contain in-depth information about specific topics.
S. Holfeltz 01 Jan 1996
S. Holfeltz 01 Sep 1995
S. Holfeltz 01 May 1995
M. Lattanzi 01 Nov 1993
Papers and Proceedings:
Selected FGS related published papers and workshop proceedings.