STScI Logo

Space Telescope Imaging Spectrograph
STAN - Sept 2009

+----------------------------------------------------------+
| HST Spectroscopy
| STScI Analysis Newsletter
| STIS
| Sept 2009
+----------------------------------------------------------+
Visit the "New in the Last 45 Days" section of the STIS 
website at http://www.stsci.edu/hst/stis for new
information about STIS.

This and previous issues of the STAN can be found at 
http://www.stsci.edu/hst/stis/documents/newsletters.

CONTENTS:

-Overview of STIS Status after Orbital Verification

-STIS NUV MAMA Detector Dark Current

-STIS CCD Detector - Living with Radiation Damage

+----------------------------------------------------------+

Overview of STIS Status after Orbital Verification

STIS was successfully repaired during SM4. While its
performance is similar to that prior to the 2004 failure, there are
some important differences.


STIS NUV MAMA Detector Dark Current

The STIS NUV MAMA, while otherwise performing well, appears
to at least temporarily have a dark current several times higher
than that which had been predicted and which was adopted for use
in the STIS Cycle 17 exposure-time calculator.  At best, it will
be several months before the dark current declines to anything close
to the expected level.


STIS CCD Detector - Living with Radiation Damage

We discuss the effects of radiation damage on the STIS CCD detector
and strategies that observers can use to mitigate these effects.


+----------------------------------------------------------+
| Need help? http://www.stsci.edu/hst/stis/help.html
+----------------------------------------------------------+
| To subscribe or unsubscribe to the STAN, send a message
| to majordomo@stsci.edu with a blank subject line and
| the following in the body: [un]subscribe stis_news
+----------------------------------------------------------+
| The Space Telescope Science Institute is operated by the
| Association of Universities for Research in Astronomy,
| Inc., under NASA contract NAS5-26555.
+----------------------------------------------------------+