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Proceedings Paper

Optical performance of the 100-sq deg field-of-view telescope for NASA's Kepler exoplanet mission
Author(s): D. Ebbets; P. Atcheson; C. Stewart; P. Spuhler; J. Van Cleve; S. Bryson
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Paper Abstract

Kepler is NASA's first space mission dedicated to the study of exoplanets. The primary scientific goal is statistical - to estimate the frequency of planetary systems associated with sun-like stars, especially the detection of earth-size planets in the Habitable Zones. Kepler was launched into an Earth-trailing heliocentric "drift-away" orbit (period = 372 days) in March 2009. The instrument detects the faint photometric signals of transits of planets across the stellar disks of those systems with orbital planes fortuitously oriented in our line-of-sight. Since the probability of such alignments is small Kepler must observe a large number of stars. In fact, Kepler is monitoring approximately 150,000 stars with a 30-minute cadence. These scientific requirements led to the choice of a classical Schmidt telescope, and requirements on field-of-view (FOV), throughput, spectral bandpass, image quality, scattered light, thermal and opto-mechanical stability and in-flight adjustment authority. We review the pre-launch integration, alignment and test program, and we describe the in-flight commissioning that optimized the optical performance of the observatory. The stability of the flight system has enabled increasing recognition of small effects and increasing sophistication in data processing algorithms. Astrophysical noise arising from intrinsic stellar variability is now the dominant term in the photometric error budget.

Paper Details

Date Published: 15 September 2011
PDF: 8 pages
Proc. SPIE 8146, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts V, 81460G (15 September 2011); doi: 10.1117/12.897445
Show Author Affiliations
D. Ebbets, Ball Aerospace & Technologies Corp. (United States)
P. Atcheson, Ball Aerospace & Technologies Corp. (United States)
C. Stewart, Ball Aerospace & Technologies Corp. (United States)
P. Spuhler, Ball Aerospace & Technologies Corp. (United States)
J. Van Cleve, NASA Ames Research Ctr. (United States)
S. Bryson, NASA Ames Research Ctr. (United States)


Published in SPIE Proceedings Vol. 8146:
UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts V
Howard A. MacEwen; James B. Breckinridge, Editor(s)

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