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Improving our understanding of the Spitzer Space Telescope's pointing drifts

Grillmair, Carl J. and Carey, Sean J. and Stauffer, John R. and Ingalls, James G. (2014) Improving our understanding of the Spitzer Space Telescope's pointing drifts. In: Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave. Proceedings of SPIE. No.9143. Society of Photo-Optical Instrumentation Engineers , Bellingham, WA, Art. No. 914359. ISBN 978-0-8194-9611-9. http://resolver.caltech.edu/CaltechAUTHORS:20150619-082340237

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Abstract

Spitzer observations of exoplanets routinely yield photometric accuracies of better than one part in 10,000. However, the attainable precision is limited in part by pointing drifts, which have the effect of moving the target to less stable or less-well characterized regions of Spitzer’s IRAC detector arrays. Here we examine a large sample of observing sequences in an effort to identify the causes of these pointing drifts. We find that short term and higher order drifts are correlated on various time scales to the temperatures of components in and around the spacecraft bus, and are most likely due to very slight angular displacements of the star trackers. Despite the constraints imposed by a limited pool of targets, such pointing drifts are best mitigated by optimal scheduling, minimizing large and/or lengthy excursions in telescope pitch angle within 24 hours of a high-precision photometry sequence. Such an effort is currently being initiated by the Spitzer Science Center.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1117/12.2057238 DOIArticle
http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1894890PublisherArticle
ORCID:
AuthorORCID
Grillmair, Carl J.0000-0003-4072-169X
Carey, Sean J.0000-0002-0221-6871
Stauffer, John R.0000-0003-3595-7382
Additional Information:© 2014 SPIE.
Group:Infrared Processing and Analysis Center (IPAC)
Subject Keywords:Spitzer Space Telescope; Exoplanets
Record Number:CaltechAUTHORS:20150619-082340237
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150619-082340237
Official Citation:Carl J. Grillmair ; Sean J. Carey ; John R. Stauffer ; James G. Ingalls; Improving our understanding of the Spitzer Space Telescope's pointing drifts. Proc. SPIE 9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave, 914359 (August 28, 2014); doi:10.1117/12.2057238
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58358
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:19 Jun 2015 16:54
Last Modified:08 Nov 2017 23:19

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