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M 10

Globular Cluster M10 (NGC 6254), class VII, in Ophiuchus

Right Ascension 16 : 57.1 (h:m)
Declination -04 : 06 (deg:m)
Distance 14.4 (kly)
Visual Brightness 6.6 (mag)
Apparent Dimension 15.1 (arc min)

Discovered 1764 by Charles Messier.

This 7th mag globular cluster is about 15.1 arc minutes in diameter, more than half the diameter of the full moon. At its distance of 14,400 light years, this corresponds to a linear diameter of 63 light years. Its bright core, however, is only little more than half as large. It is receding from us at 69 km/sec.

Its central region, according to Mallas, appears pear-shaped, with a grainy texture; the outer regions show brighter knots at medium magnification (120x).

According to Burnham, the extremely low number of only 3 variables has been found in M10; the ``Catalog of Galactic Globular Clusters" of R. Monella of the Sharru Astronomical Observatory, COVO (Bergamo), Italy (ADC/CDS number VII, 103) gives the number of 4.

  • Historical Observations and Descriptions of M10
  • More images of M10
  • Amateur images of M10

  • SIMBAD Data of M10
  • NED Data of M10
  • Observing Reports for M10 (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