Beobachtung des Cometen 1900 a
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F. Cohn
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Article
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1900
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John Wiley and Sons
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English
โ 88 KB
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In a photograph taken by Prof. Max Wolf on June I , 1891, with a lens having an aperture of 134 mm and a focal length of 770 mm, and published in BKnowledgea for 1891, p. 189, the variable appears distinctly fainter than e (est. mag. = 10.2); and in another one published in the same periodical, p.18