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Proceedings Paper

Straylight analysis of the Next-Generation Space Telescope
Author(s): Pierre Y. Bely; Larry Petro; Kimberly I. Mehalick; Charles M. Perrygo
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Paper Abstract

Current concepts for the NGST call for an 'open' telescope design in order to passively cool the telescope and instrument to cryogenic temperatures. We show that, in spite of the lack of an external baffle, straylight due to off- axis sources is negligible compared to the zodiac light. We also show that the instrumental thermal emission is in general dominated by scatter from the sunshield and not by emission from the optics. The back surface of the sunshield needs to be at about 180 K or less to reduce the self emission of the observatory to a negligible level in the near-IR, and at about 90 K or less in the case of the mid- IR.

Paper Details

Date Published: 28 August 1998
PDF: 8 pages
Proc. SPIE 3356, Space Telescopes and Instruments V, (28 August 1998);
Show Author Affiliations
Pierre Y. Bely, Space Telescope Science Institute (United States)
Larry Petro, Space Telescope Science Institute (United States)
Kimberly I. Mehalick, Swales Aerospace, Inc. (United States)
Charles M. Perrygo, Swales Aerospace, Inc. (United States)

Published in SPIE Proceedings Vol. 3356:
Space Telescopes and Instruments V
Pierre Y. Bely; James B. Breckinridge, Editor(s)

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