NGC 2311 (also OCL 553) is a magnitude +9.6 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) f/13 speculum reflector at Windsor Road in Slough, Berkshire, on the 26th November 1786.
Right Ascension 06h 57m 47.5s, Declination -04° 36' 41"
