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M 75

Globular Cluster M75 (NGC 6864), class I, in Sagittarius

Right Ascension 20 : 06.1 (h:m)
Declination -21 : 55 (deg:m)
Distance 61.3 (kly)
Visual Brightness 8.5 (mag)
Apparent Dimension 6.0 (arc min)

Discovered 1780 by Pierre Méchain.

At a distance of about 61,000 light years, M75 is one of the more remote of Messier's globular clusters, lying well beyond the Galactic center. Some sources give even larger distances, up to as much as 100,000 light years ! (E.g., Burnham has 95,000, but W.E. Harris' database has it with 61,300 which we adopt here.) This would make it the most remote Messier globular, and the most remote galactic Messier object at all.

M75 is one of the more compact, concentrated globulars, classified as class I. Because of this and its distance, larger scopes are required to resolve it into stars. Its angular diameter of 6' corresponds to a linear extension of well over 100 light years, and it is of high luminosity, perhaps about 160,000 times that of the Sun (Mag -8.3).

  • Historical Observations and Descriptions of M75
  • More images of M75
  • Amateur images of M75

  • SIMBAD Data of M75
  • NED Data of M75
  • Observing Reports for M75 (IAAC Netastrocatalog)

    Hartmut Frommert (spider@seds.org)
    Christine Kronberg (smil@lrz.uni-muenchen.de)

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    Last Modification: 9 Dec 1999, 22:58 MET