attempt to determine photovisual magnitudes without a colour-filter
Subtitle: and a study of the colours and the magnitudes of the stars in the galactic cluster Messier 7 and its surroundings.
Contributors: Bosscha-Sterrenwacht, Lembang
Series: Annalen v.d. Bosscha-Sterrenwacht, Lembang, vol, 3, 4e Gedeelte
Publisher: Nix
Published: 1931
Place of publication: Bandoeng
Language: eng
Number of pages: 53
Subjects: Stars -- Colour; Stars -- Magnitudes