The visual magnitudes of stars in the Almagest of Ptolemeus and in later catalogues.

Details The visual magnitudes of stars in the Almagest of Ptolemeus and in later catalogues. The visual magnitudes of stars in the Almagest of Ptolemeus and in later catalogues.

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26as..106..581s&link_type=abstract

Astronomy and Astrophysics Suppl. 106, 581-585 (1994)

Astronomy and Astrophysics

Astronomy

History Of Astronomy, Techniques: Photometric, Variable Stars

Scientific paper

The visual magnitudes of the Almagest have been compared with modern photoelectric measurements in V. Later catalogues equally based on visual estimates have been included. The various catalogues correlate rather well. Systematic effects due to extinction and the colour of the stars have been investigated. In spite of the hopes of the early observers no stars with very slow but systematic brightness variations have been found.

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