Messier 22: 73 Years Ago

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

This picture shows the globular cluster Messier 22 = NGC 6656, photographed (Plate no. 390; exposure 90 min) on August 26, 1913 with the f/17 40 cm astrograph at the Zo-Se station of the Shanghai observatory (P. R. China). The station is situated just south of Shanghai at a geographic latitude of +31°. Since this globular cluster lies in the southern Milky Way at R. A. = 18h 33m; Oecl. = -23° 58', the telescope was pointed close to the southern horizon. Messier 22 is the third nearest globular cluster at a distance of about 3 kpc.

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