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2. Photoelectric observations of the comets 1956h (Arend-Roland) and 1957d (Mrkos)

Creator:
Vanýsek, V. and Tremko, J.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
photoelectric observations, colour index, and comets
Language:
Czech
Description:
The present paper is an evaluation of photoelectric observations of teh eomts 1956h amd 1957d, made at the observatory of the University in Brno. The observations were carried out both in integral light and in selected spectral ranges, corresponding to the international colour system. the colour index of the comet 1956h indicates a sudden drop on May 2nd, which has been verified also by other observations. This drop is explicable only by an increased emission of gases into the coma. The mean colour index is 0.58, which corresponds to the colour index of stars of the spectral class GO. The mean colour index of part of the tail is - if we disregard the drop on May 2nd - +0·78. The photometric parameters, derived from flawless observations are m0υ = 6·55. nυ = 2·03 and m0B = 7·15, nB = 2·30. One good observation of the comet 1957d yielded the colout index of 0·15.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public