ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY
Open star cluster M46. M46 (NGC 2437). North is at top. Also visible near centre as a nebulosity around one of the stars is the planetary nebula Herschel IV 39 Argus (H IV.39, NGC 2438). M46 is around 5500 light years away, in the constellation of Puppis. This 90-minute exposure was obtained on 24 February 1894, from the observatory in Crowborough, Sussex, UK. This observatory was built and operated by British amateur astronomer Isaac Roberts (1829-1904), one of the pioneers of the new techniques of astrophotography.
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