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Messier 65

Spiral Galaxy M65 (NGC 3623), type Sa, in Leo

in the Leo Triplett

Right Ascension 11 : 18.9 (h:m)
Declination +13 : 05 (deg:m)
Distance 35000 (kly)
Visual Brightness 9.3 (mag)
Apparent Dimension 8x1.5 (arc min)

Discovered 1780 by Charles Messier.

Messier 65 (M65, NGC 3623), together with its neighbors M66 and NGC 3628, forms a most conspicuous triplet of galaxies, the Leo Triplett or M66 group, located at a distance of about 35 million light years.

Although it is close to and thus under the gravitational influence of its neighbors, M65 looks like a very "normal" Sa type spiral and seems to have felt little influence. It has a prominent central lense and tightly wound spiral arms, plus a prominent dust lane marking the facing edge. The luminous disk is dominated by a smooth old stellar population. Near the lane, some knots are visible, which, according to J.D. Wray, may be associated with star forming regions. The lane may hide regions of star formation usually associated with such features in spiral galaxies.

Our image of M65 was obtained by David Malin with the Anglo Australian Telescope; interested readers may obtain more detailed information on our image.

M65, together with its neighbor, M66, has been discovered by Charles Messier, who cataloged it on March 1, 1780, describes it as "very faint nebula without stars." Because of a dubious error, Admiral Smyth has assigned this discovery of M65 and M66 (and M68) to Pierre Méchain, a view which was adopted by Kenneth Glyn Jones somewhen in the 1960s, and consequently, in many sources, despite the fact that Messier doesn't acknowledge such a prior sighting, which he did in all other cases.

Halton Arp includes M65 in his entry number 317 of his Catalogue of Peculiar Galaxies, which denotes the Leo Triplett.

  • Historical Observations and Descriptions of M65
  • More images of M65
  • Amateur images of M65
  • More images of M65 and M66, sometimes including NGC 3628 (the whole Leo Triplett)

  • Multispectral Image Collection of M65, SIRTF Multiwavelength Messier Museum
  • SIMBAD Data of M65
  • NED Data of M65
  • Publications on M65 (NASA ADS)
  • Observing Reports for M65 (IAAC Netastrocatalog)
  • NGC Online data for M65

    Hartmut Frommert
    Christine Kronberg

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    Last Modification: August 30, 2007