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Proceedings Paper

Dynamic analyses of the proposed habitable exoplanet astrophysics facility
Author(s): J. Brent Knight; H. Philip Stahl; Thomas Brooks
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Paper Abstract

The proposed Habitable Exoplanet (HabEx) astrophysics facility is one of four large such facilities being proposed to the 2020 decadal. It is a large telescope that is sensitive to ultraviolet, optical, and near-infrared photons. The proposed design’s overall length is on the order of 17.2 m and its maximum cross section is on the order of 5.25 × 5.25 m. The primary mirror is 4 m in diameter. A transient dynamic analysis was performed to estimate the order of magnitude of ring down time after moving the telescope and pointing at a new target for science planning purposes. Without uncertainty factors, results from a simple re-pointing maneuver indicate that primary to secondary mirror LOS errors are on the order of 10-4 pico-m after 5 minutes. Also, a frequency response analysis was performed to predict the impact of planned micro-thruster vibrations on required stability. Based on provided noise level associated with the micro-thrusters and loading assumptions and without uncertainty factors, the assessed vibrations do not impact predicted performance requirements.

Paper Details

Date Published: 11 September 2019
PDF: 6 pages
Proc. SPIE 11103, Optical Modeling and System Alignment, 111030F (11 September 2019); doi: 10.1117/12.2530385
Show Author Affiliations
J. Brent Knight, NASA Marshall Space Flight Ctr. (United States)
H. Philip Stahl, NASA Marshall Space Flight Ctr. (United States)
Thomas Brooks, NASA Marshall Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 11103:
Optical Modeling and System Alignment
Mark A. Kahan; José Sasián; Richard N. Youngworth, Editor(s)

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