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Proceedings Paper

Imaging planets about other stars with UMBRAS II
Author(s): Alfred B. Schultz; Ian J.E. Jordan; Helen M. Hart; Fred Bruhweiler; Dorothy A. Fraquelli; Forrest C. Hamilton; John L. Hershey; Mark Kochte; Mike A. DiSanti; Cherie L. Miskey; K. P. Cheng; Melodi Rodrigue; Bruce Johnson; Sami Fadali
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Paper Abstract

In this paper we discuss operational considerations for the free-flying occulter. Operations consist of maneuvering the Solar-Powered Ion-Driven Eclipsing Rover (SPIDER) between targets, alignment with the space-based telescope line of sight to the target, and stationkeeping target-to-target maneuvers need to be optimized to conserve propellant. A reasonable balance needs to be determined between target observation rate and the number of targets that are observable during mission lifetime. Velocity matching of the SPIDER with the telescope is essential to mission performance. An appropriate combination of solar electric and cold-gas thrusters provides the ability to match velocities using positional information derived from comminution and ranging between telescope, occulter and any metrology stations. Desirable features of using an external coronagraphic vehicle include the ability to obtain coronagraphic data with any instrument on the telescope-- imaging, spectroscopic, or interferometric.

Paper Details

Date Published: 16 November 2000
PDF: 9 pages
Proc. SPIE 4131, Infrared Spaceborne Remote Sensing VIII, (16 November 2000); doi: 10.1117/12.406562
Show Author Affiliations
Alfred B. Schultz, Computer Sciences Corp. and Space Telescope Science Institute (United States)
Ian J.E. Jordan, Computer Sciences Corp. and Space Telescope Science Institute (United States)
Helen M. Hart, Computer Sciences Corp. and Johns Hopkins Univ. (United States)
Fred Bruhweiler, Catholic Univ. of America (United States)
Dorothy A. Fraquelli, Computer Sciences Corp. and Space Telescope Science Institute (United States)
Forrest C. Hamilton, Computer Sciences Corp. and Space Telescope Science Institute (United States)
John L. Hershey, Computer Sciences Corp. and Space Telescope Science Institute (United States)
Mark Kochte, Computer Sciences Corp. and Space Telescope Science Institute (United States)
Mike A. DiSanti, Catholic Univ. of America (United States)
Cherie L. Miskey, Catholic Univ. of America (United States)
K. P. Cheng, California State Univ./Fullerton (United States)
Melodi Rodrigue, Univ. of Nevada/Reno (United States)
Bruce Johnson, Univ. of Nevada/Reno (United States)
Sami Fadali, Univ. of Nevada/Reno (United States)


Published in SPIE Proceedings Vol. 4131:
Infrared Spaceborne Remote Sensing VIII
Marija Strojnik; Bjorn F. Andresen, Editor(s)

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