NGC 6231
DSS image of NGC 6231
Overlaid DSS image of NGC 6231, 30' x 30' with north at top and west to the right

Aladin viewer for the region around NGC 6231
Table of Scorpius Cluster
Lac II.13 , Collinder 315, Cr 315, C 1650-417, OCl 997.0

Type  Open Cluster w/Nebulosity
Magnitude  2.6
Size  15'
RA (2000)  16h 54' 11.0"
Dec (2000)  41° 49' 27" S
Constellation  Scorpius
Description  Cl, B, cL, pRi, st10..13
Classification  I 3 r n
Observing Notes

Andrew Cooper
Aug 9, 2020    Waikoloa, HI (map)
20cm f/6 Newtonian, Cave Astrola @ 76x

A stunning and rich open cluster at the base of Scorpio, lovely in binoculars and the telescope, large, rich, fully resolved, filling the field with bright stars, a central group about 5' across is a bright cluster of several dozen 5-7 magnitude stars within the larger cluster mass

Andrew Cooper
Jun 29, 2019    Kaʻohe, Mauna Kea, HI (map)
8x42mm Nikon Prostaff 3S Binoculars @ 8x

A tight, bright, small cluster at the southern reach of the much larger Cr316 and Tr24, a very pretty field for low power binoculars

- None

Andrew Cooper
Apr 6, 2007    Hale Pohaku, HI (map)
15cm f/5 Newtonian, Primero @ 97x

Very bright!! conspicuous to the unaided eye in the lower reach of Sco, bright member stars give a coarse appearance, together with the larger Trumpler24 give the aspect of a comet

Andrew Cooper
May 27, 2006    Gila, NM (map)
46cm f/4.5 Deep Violet

Brilliant cluster near the bottom of Scorpio, naked eye object, rich, bright, dominated by a handful of 6th magnitude stars, well over a hundred members scattered in a 15' area, the whole complex gives the impression of a comet low on the horizon below Scorpio with NGC6231 as the coma and Trumpler 24 the tail
Other Data Sources for NGC 6231
Associated objects for NGC 6231
Nearby objects for NGC 6231
Acknowledgements and Credits...

Drawings, descriptions and CCD photos are copyright Andrew Cooper unless otherwise noted, no usage without permission.

Positional and some physical information is from the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.

Additional object data from the SIMBAD database, operated at CDS, Strasbourg, France.

The Digitized Sky Survey was produced at the Space Telescope Science Institute under U.S. Government grant NAG W-2166. The images of these surveys are based on photographic data obtained using the Oschin Schmidt Telescope on Palomar Mountain and the UK Schmidt Telescope.

Dark nebulae data from E.E. Barnard, A Photographic Atlas of Selected Regions of the Milky Way. Ed. Edwin B. Frost and Mary R. Calvert. Carnegie Institution of Washington, 1927

Object descriptions of Rev. Webb from Celestial Objects for Common Telescopes sixth edition, Rev. T.W. Webb, 1917, edited by Rev T.E.Espin.

NGC & IC object notes from Harold Corwin licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License. Additional supplementary material for NGC and IC catalog objects from Courtney Seligman with non-commercial use allowed, found at

NGC 6231