Observational status of the UNSO trigonometric parallax program

Details Observational status of the UNSO trigonometric parallax program Observational status of the UNSO trigonometric parallax program

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.177..193d&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 177, no. 1-2, March 1991, p. 193-198.

Astronomy and Astrophysics

Astrophysics

Astrometry, Astronomical Photometry, Stellar Parallax, Astronomical Photography, Automatic Control, Charge Coupled Devices

Scientific paper

Since 1983, a TI 800 x 800 CCD has been routinely used on the 1.5-m astrometric reflector during dark time to measure parallaxes of faint (V not less than 16.0) stars. The rest of the time remains devoted to the fine-grain (Kodak type IIIa emulsions) photographic parallax program, which now uses magnitude compensating filters to extend the range of the program to V = 0. Sufficient data are now available to evaluate the precisions of these programs. For CCD fields, the mean error for the relative parallax ranges from + or - 0.0025 arcsec for fields with relatively few observations to + or - 0.0005 arcsec for intensively observed fields such as vB10. The photographic program is now producing relative parallaxes with average mean errors of + or - 0.0026 arcsec compared to + or - 0.0038 arcsec previously obtained with coarse grain emulsions.

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