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Proceedings Paper

Engineering considerations applied to starshade repointing
Author(s): Norman Rioux; Donald Dichmann; Shawn Domagal-Goldman; Avi Mandell; Aki Roberge; Chris Stark; Eric Stoneking; Dewey Willis
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Paper Abstract

Engineering analysis has been carried out on orbit dynamics that drive the delta-v budget for repointing a free-flying starshade occulter for viewing exoplanets with a space telescope. This analysis has application to the design of starshade spacecraft and yield calculations of observations of exoplanets using a space telescope and a starshade. Analysis was carried out to determine if there may be some advantage for the global delta-v budget if the telescope performs orbit changing delta-v maneuvers as part of the telescope-starshade alignment for observing exoplanets. Analysis of the orbit environmental forces at play found no significant advantage in having the telescope participate in delta-v maneuvers for exoplanet observation repointing. A separate analysis of starshade delta-v for repointing found that the orbit dynamics of the starshade is driven by multiple simultaneous variables that need to be considered together in order to create an effective estimate of delta-v over an exoplanet observation campaign. These include area of the starshade, dry mass of the starshade spacecraft, and propellant mass of the starshade spacecraft. Solar radiation pressure (SRP) has the potential to play a dominant role in the orbit dynamics and delta-v budget. SRP effects are driven by the differences in the mass, area, and coefficients of reflectivity of the observing telescope and the starshade. The propellant budget cannot be effectively estimated without a conceptual design of a starshade spacecraft including the propulsion system. The varying propellant mass over the mission is a complexity that makes calculating the propellant budget less straightforward.

Paper Details

Date Published: 29 July 2016
PDF: 14 pages
Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 99043L (29 July 2016); doi: 10.1117/12.2233541
Show Author Affiliations
Norman Rioux, NASA Goddard Space Flight Ctr. (United States)
Donald Dichmann, NASA Goddard Space Flight Ctr. (United States)
Shawn Domagal-Goldman, NASA Goddard Space Flight Ctr. (United States)
Avi Mandell, NASA Goddard Space Flight Ctr. (United States)
Aki Roberge, NASA Goddard Space Flight Ctr. (United States)
Chris Stark, Space Telescope Science Institute (United States)
Eric Stoneking, NASA Goddard Space Flight Ctr. (United States)
Dewey Willis, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 9904:
Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave
Howard A. MacEwen; Giovanni G. Fazio; Makenzie Lystrup; Natalie Batalha; Nicholas Siegler; Edward C. Tong, Editor(s)

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