Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983msngr..32...29g&link_type=abstract
The Messenger, No. 32:JUN, P.29, 1983
Astronomy and Astrophysics
Astronomy
5
Scientific paper
From the beginning of the discoveries of minor planets in the last century their brightness has been a subject for study. For astronomers mainly interested in variable stars and stellar magnitudes, the minor planets could be a useful tool for transferring the magnitude scale uniformly over the sky. From the observational point of view, minor planets were like variable stars with light variations which could be computed from the distances to the Sun and the Earth. However, at that time the stellar magnitude scale was arbitrary and based only on sUbjective estimates. It was therefore necessary to determine the ratio of light corresponding to a difference of one unit of stellar magnitude. We owe the magnitude scale of our time to N. Pogson, who in his ephemerides of the brightness of 36 minor planets for the year 1857 (1) adopted a light ratio of 2.512 fOr the difference of one magnitude.
Gammelgaard Peter
Kristensen Leif Kahl
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