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Monoceros(mŏ-noss -ĕ-rŏs) (Unicorn) An inconspicuous equatorial constellation near Orion, lying in the Milky Way, the brightest stars being of 3rd and 4th magnitude. It contains the triple star Beta (β) Monocerotis and the double Epsilon (Ɛ) and several variables including R Monocerotis, a young stellar object that lights up Hubble's variable nebula. There are many open clusters, including NGC 2244, surrounded by the Rosette nebula, and NGC 2264, which includes the multiple star S Mon and in whose surrounding nebulosity lies the dark Cone nebula. The object A0620-00 is a possible black hole. Abbrev.: Mon; genitive form: Monocerotis; approx. position: RA 7h, dec 0°; area: 482 sq deg.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
A constellation, right ascension 7 hours, declination 5° south; it has mostly faint stars.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.