Relative astrometry with the Steward Observatory CCD/Transit Instrument

Details Relative astrometry with the Steward Observatory CCD/Transit Instrument Relative astrometry with the Steward Observatory CCD/Transit Instrument

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101..279b&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 101, Jan. 1991, p. 279-289. Research supported by the Data General Corp.

Astronomy and Astrophysics

Astronomy

13

Astrometry, Astronomical Observatories, Charge Coupled Devices, Astronomical Spectroscopy, Photographic Plates, Position (Location), Sky Surveys (Astronomy)

Scientific paper

The CCD/Transit Instrument can produce relative astrometry with 1-sigma errors of less than 40 mas for stars brighter than V = 17. This figure of merit is obtained from ten nights' data. This precision is obtained over a test region of 8 x 12 arcmin, using simple first-moment centering algorithms. Errors for stars with V from 17.0 to 18.8 range from 40 to 100 mas. Some 3-sigma proper motions are detected. The test field sample contains three stars with proper motions larger than 20 mas/year. Four of the five stars in the test region with colors indicating spectral type M2 or later have statistically significant proper motions.

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