NGC 6397

Globular cluster NGC 6397 (= Lacaille III.11 = Dunlop 366 = Bennett 98), class IX, in Ara

[NGC 6397, Kohle/Credner]
Right Ascension 17 : 40.7 (h:m)
Declination -53 : 40 (deg:m)
Distance 7.2 (kly)
Visual Brightness 5.9 (mag)
Apparent Dimension 26.0 (arc min)

Discovered by Lacaille in 1751-52.

This conspicuous globular is one of the two nearest to us (the other one is M4); currently it seems that M4 is a bit closer: M4 is at about 6,800 and NGC 6397 at 7,200 light years, but the uncertainty is large enough that the sequence may change..

NGC 6397 is one of the at least 20 globulars of our Milky Way Galaxy which have undergone a core collapse, i.e. its core has contracted to a very dense stellar agglomeration; this is the nearest such globular.

The image in this page was obtained by Till Credner and Sven Kohle. It is a magnification of a small region of a much larger (wider-field, 27x39 deg) photograph obtained within their Constellations Triangulum Australe, Norma, Ara photography, which was obtained by Sven Kohle on June 11, 1994, 02:23 LT from Cerro Tololo, Chile with a 50mm f/2.8 photo lens, exposed 30 min on Scotchchrome 400 film.

  • More images from Till Credner and Sven Kohle

    In John Caldwell's observing list. In the Astronomical League's Southern Sky Binocular Club list. Caldwell 86 in Patrick Moore's list.

    The HST has investigated globular cluster NGC 6397 for faint red dwarf stars, in order to check the abundance of these "Dark Matter" candidates. Look at the first and second HST press release on this thread.

  • Marco Castellani's data for NGC 6397
  • Christine Clement's Catalog of Variable Stars in NGC 6397
  • SIMBAD Data of NGC 6397
  • Publications on NGC 6397 (NASA ADS)
  • Observing Reports for NGC 6397 (IAAC Netastrocatalog)
  • NGC Online data for NGC 6397

    Hartmut Frommert
    Christine Kronberg
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    Last Modification: March 29, 1998