The extension of the fundamental system to fainter magnitudes

Details The extension of the fundamental system to fainter magnitudes The extension of the fundamental system to fainter magnitudes

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985cemec..37..285c&link_type=abstract

Celestial Mechanics (ISSN 0008-8714), vol. 37, Nov. 1985, p. 285-298.

Astronomy and Astrophysics

Astronomy

2

Astrometry, Astronomical Catalogs, Faint Objects, Stellar Magnitude, Histograms, Position (Location), Star Distribution, Stellar Spectra

Scientific paper

During the past 100 years the fundamental system has developed from a small list of 623 bright stars to one of 1535 stars. The compilation of the next fundamental catalog, the FK5, will involve the addition of some 3200 stars and will extend the system to magnitude 9.0. A number of criteria were used for selecting the 2000 stars in the seventh to ninth magnitude portion of the extension, the Faint Fundamentals. These criteria include distribution in magnitude and spectral type, quality of the observational histories, mean errors of the proper motions and distribution over the sky. These criteria have proven difficult to satisfy, especially at the faint end of the magnitude range and in the Southern Hemisphere.

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