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Proceedings Paper

Targeting and sequencing algorithms for the Hectospec's optical fiber robotic positioner
Author(s): John B. Roll Jr.; Daniel G. Fabricant; Brian A. McLeod
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Paper Abstract

The Hectospec is a moderate dispersion spectrograph fed by 300 optical fibers. Hectospec's pair of five-axis robots will position fibers at the 1 degree diameter f/5 focus of the converted MMT, allowing efficient multi-object spectroscopy. We discuss algorithms that we have developed to match the optical fibers to celestial objects and then to compute the appropriate sequence of robotic positioner moves to reconfigure the fibers between successive observations. Both algorithms require essentially no user interaction, consume only modest computer resources and allow effective deployment of the Hectospec's 300 fibers. The target-to-fiber matching algorithm is a recursive procedure which allows simultaneous optimization of the multiple observations that are required to complete a large survey. The robotic motion sequence algorithm allows the two Hectospec robots to work together efficiently to move fibers directly between observing configurations.

Paper Details

Date Published: 9 July 1998
PDF: 9 pages
Proc. SPIE 3355, Optical Astronomical Instrumentation, (9 July 1998); doi: 10.1117/12.316837
Show Author Affiliations
John B. Roll Jr., Harvard-Smithsonian Ctr. for Astrophysics (United States)
Daniel G. Fabricant, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Brian A. McLeod, Harvard-Smithsonian Ctr. for Astrophysics (United States)

Published in SPIE Proceedings Vol. 3355:
Optical Astronomical Instrumentation
Sandro D'Odorico, Editor(s)

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