STScI Logo

Space Telescope Imaging Spectrograph
STAN - October 2001

STScI Analysis Newsletter

Spectrographs Group (STIS/GHRS/FOS)

October, 2001

Visit the STIS web site "New in the Last 45 Days" for new information about STIS.

This month: Scaling Side-2 CCD Dark Frames with Temperature

Due to a failure of the STIS primary (Side-1) electronics, the redundant (Side-2) electronics have been in use since July 2001. The redundant electronics allow larger fluctuations in CCD temperature, resulting in significant variations in CCD dark rate (see ISR STIS 2001-003). Eventually, dark subtraction in the archive pipeline will automatically handle dark rate variations, but for now darks can be scaled manually as a function of temperature.

As a proxy for CCD detector temperature, the CCD housing temperature (CCDHTAV) will be added to STIS science headers. Until this keyword is available, we will maintain a CCD housing temperature log.


Need help?

To unsubscribe from this mailing list send email to with the message: unsubscribe stis_news

The Space Telescope Science Institute is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS5-26555