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Messier 26

Open Cluster M26 (NGC 6694), type 'f', in Scutum

Right Ascension 18 : 45.2 (h:m)
Declination -09 : 24 (deg:m)
Distance 5.0 (kly)
Visual Brightness 8.0 (mag)
Apparent Dimension 15.0 (arc min)

Discovered by Charles Messier in 1764.

Open cluster Messier 26 (M26, NGC 6694) is not so impressive as its apparent neighbor, M11. Its discoverer Charles Messier, who cataloged it on June 20, 1764, even noted that it was "not distinguished in a 3.5 foot (FL) telescope and needed a better instrument."

Nevertheless, this is a tight, beautiful open cluster with brightest stars of mag 11.9, spectral type B8. Burnham mentions about 25 stars visible in 6-8 inch scopes and about 70 fainter members, Mallas/Kreimer overall 90. Its diameter of 22 light-years appear as 15 arc minutes from the 5,000 light years distance. The Sky Catalogue 2000.0 gives a calculated age of 89 million years for this cluster.

As Kenneth Glyn Jones mentions, James Cuffey of the Kirkwood Observatory, Indiana University, reported that a striking feature of this cluster is a well-defined zone of low star density in a region of diameter 3'.1, immediately surrounding the nucleus. It is more probable that this region is obscured by dark interstellar matter than that it is a real "hole" in the stellar population.

M26 was classified as of Trumpler type II,2,r (Trumpler), I,1,m (Sky Catalog 2000), and II,3,m (Götz).

  • Historical Observations and Descriptions of M26
  • More images of M26
  • Amateur images of M26

  • WEBDA cluster page for M26
  • SIMBAD Data of M26
  • NED Data of M26
  • Publications on M26 (NASA ADS)
  • Observing Reports for M26 (IAAC Netastrocatalog)
  • NGC Online data for M26

    Hartmut Frommert
    Christine Kronberg

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    Last Modification: August 21, 2007