Astrometry in the Era of Large Etendue

Details Astrometry in the Era of Large Etendue Astrometry in the Era of Large Etendue

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21422901m&link_type=abstract

American Astronomical Society, AAS Meeting #214, #229.01; Bulletin of the American Astronomical Society, Vol. 41, p.732

Computer Science

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Etendue is the product of the telescope's collecting area and realized field of view, and provides a useful metric for survey instruments. Two surveys are in progress, Pan-STARRS PS1 and SkyMapper, and these will deliver both accurate photometry and milliarcsecond-class astrometry. Because these surveys cover the entire visible sky several times per lunation, stellar parallax can be added to the list of astrometric quantities to be measured. With luck, a pole to pole catalog of stellar parallaxes and proper motions down to something like 20th r-band magnitude will be available in the next few years. Early results should include a relatively complete inventory of stars closer than 10 parsec and a more complete list of high proper motion stars than is currently available.
Of course, ESA's Gaia mission will obviate many of the astrometric and photometric results from these large etendue surveys, but there are two key areas where ground-based surveys can be important. First, the Gaia aperture is relatively small. Large etendue telescopes such as the 8.4-m LSST can go 5 or more magnitudes fainter will still providing useful astrometric accuracy. Second, the Gaia mission is relatively short, so programs like the search for unseen companions can benefit from longer duration surveys done from the ground.
A summary of the large etendue systems will be given, and a progress report for each will be presented. Emphasis will be placed on their astrometric performance, and early results from at least PS1 will be shown.

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