Creating a Predictive ACIS Focal Plane Temperature Model

Details Creating a Predictive ACIS Focal Plane Temperature Model Creating a Predictive ACIS Focal Plane Temperature Model

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.4001a&link_type=abstract

American Astronomical Society, HEAD meeting #11, #40.01; Bulletin of the American Astronomical Society, Vol. 41, p.720

Astronomy and Astrophysics

Astronomy

Scientific paper

Now into its 11th observing cycle, the Chandra X-Ray Observatory continues to deliver excellent science to the High Energy community. The orbit and the thermal conditions on the spacecraft have changed over the mission and we must be able to predict the thermal stability of system to schedule observations that will maximize the science return of the observatory.
This poster will discuss the predictions of the ACIS focal plane temperature as a function of the orbit and pointing. The largest contributor to the heating of the ACIS focal plane is Earth shine on the cold radiator. A secondary factor is the pitch angle of the spacecraft with respect to the sun. In the next few years, the orbit will be changing so that the apparent size of the Earth is larger during perigees. We would need to have an accurate model of the ACIS Focal Plane temperatures during these times.
We have created three different methods for estimating the amount of Earth in the radiator field of view. From these methods, we will attempt to accurately predict times when the cold radiator will not cool the instrument efficiently and to accurately predict focal plane temperatures, so that appropriate scheduling rules can be developed consistent with keeping the focal plane cold and stable.

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