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  • 1
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    Terrestrial Planet Finder Coronagraph Observatory summary (2005)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Creating an optical space telescope observatory capable of detecting and characterizing light from extra-solar terrestrial planets poses technical challenges related to extreme wavefront stability. The Terrestrial Planet Finder Coronagraph design team has been developing an observatory based on trade studies, modeling and analysis that has guided us towards design choices to enable this challenging mission. This paper will describe the current flight baseline design of the observatory and the trade studies that have been performed. The modeling and analysis of this design will be described including predicted performance and the tasks yet to be done.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Direct Imaging of Exoplanets : Science and Techniques; Oct 03, 2004 - Oct 07, 2004; Nice; France
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Design and Performance of the Terrestrial Planet Finder Coronagraph (2004)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Terrestrial Planet Finder Coronagraph, one of two potential architectures, is described. The telescope is designed to make a visible wavelength survey of the habitable zones of at least thirty stars in search of earth-like planets. The preliminary system requirements, optical parameters, mechanical and thermal design, operations scenario and predicted performance is presented. The 6-meter aperture telescope has a monolithic primary mirror, which along with the secondary tower, are being designed to meet the stringent optical tolerances of the planet-finding mission. Performance predictions include dynamic and thermal finite element analysis of the telescope optics and structure, which are used to make predictions of the optical performance of the system.
    Keywords: Astronomy
    Type: SPIE Conference on Astronomical Telescopes and Instrumentation; Jun 21, 2004 - Jun 23, 2004; Glasgow, Scotland; United Kingdom
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Multiple-Cone Sunshade for a Spaceborne Telescope (2008)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A document describes a sunshade assembly for the spaceborne telescope of the Terrestrial Planet Finder Coronagraph mission. During operation, the telescope is aimed at target stars in the semihemisphere away from the Earth's Sun. The observatory rotates about its pointing axis during a single star observation, resulting in relative movement of the Sun. The sunshade assembly protects the telescope against excessive solar-induced thermal distortions for times long enough to complete observations. The assembly includes a cylindrical baffle immediately surrounding the telescope, and a series of coaxial conical shields at half-cone angle increments of between 3 and 6. The black inner surface of the cylindrical baffle suppresses stray light. The outer surface of the cylindrical baffle and all the surfaces of the conical shields except the outermost one are specular and highly reflective in the infrared. The outer surface of the outer shield is a material with low solar absorptance and high infrared emittance, such as silverized Teflon or white paint. This arrangement strongly radiatively couples each shield layer more effectively to cold space than to adjacent shield layers. The result is that the solar-driven temperature gradients in the cylindrical baffle are nearly negated, and only weakly communicated to the highly-infrared-reflective face of the primary telescope mirror.
    Keywords: Solar Physics
    Type: NPO-41419 , NASA Tech Briefs, January 2008; 37
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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