NGC 1645 (also PGC 15903, MCG -1-13-2 or NPM1G -05.0213) is a magnitude +13.0 lenticular galaxy located 225 million light-years away in the constellation Eridanus.
The galaxy was discovered by German astronomer Heinrich Louis d'Arrest using a 27.94 cm (11 inch) f/17.5 refractor at the Copenhagen Observatory on the 31st October 1864.
Right Ascension 44d 04h 06.3s, Declination -05° 27' 54"
