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Two dark nebulae in M24 in Sagittarius
Two dark nebulae in M24 in Sagittarius
Lynds' Catalogue of Dark Nebulae (LDN 327 and 323) show up well in these two images. Of almost equal interest are the stars that are very bright in the infra-red but almost invisible in V (green) band. These stars must be very cool red giants?. Lynds' Catalogue was based on a study of the red and blue prints of the National Geographic - Palomar Observatory Sky Atlas. The catalogue contains positions for the centers of dark nebulae or clouds found by Lynds, the cloud sizes in square degrees and visual estimates of their opacity. Many make excellent targets for the amateur astronomer. http://www.martin-nicholson.info/baa/darkregions2.htm Martin Nicholson, Daventry, England. My website is at http://www.martin-nicholson.info/1/1a.htm My informal Astronomical Blog is at http://ukastronomy.livejournal.com/ |
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