The emission nebula IC 4628
AAO image reference AAT 105.    « Previous || Next »

The emission nebula IC 4628, ic4628.jpg
Top left is NE. Image width is about 52 arc min
Image and text © 1987-2010, Australian Astronomical Observatory, photograph by David Malin.

This beautiful, arc-like rim of nebulosity is in the far southern sky in Scorpius, out of sight from most of the USA and Europe. It is quite faint and has often been overlooked because of it, even by southern observers. The richness of this part of the sky is reflected in the number of names associated with the objects in the field illustrated here. There is a large scattered star cluster, Collinder 316 which extends over most of the picture. It encloses Trumpler 24, more or less the same cluster under another name, and all of this is part of the Sco OB1 association, a much larger gathering of very hot, intrinsically luminous stars in this part of the sky. The nebula itself is also known as Gum 56, after the Australian astronomer Colin Gum, who catalogued emission nebulae in the using wide field photography.

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Updated by David Malin, 2010, August 1