NGC 2251 (also OCL 499) is a magnitude +7.3 open star cluster located in the constellation Monoceros.
The cluster was discovered by German-British astronomer William Herschel using a 47.5 cm (18.7 inch) reflecting telescope at Datchet, Berkshire, on the 26th December 1783.
Right Ascension 06h 34m 38.5s, Declination +08° 21' 59"
