NGC 171 (also NGC 175, ESO 540-6, IRAS 00348-2012, MCG -3-2-24 and PGC 2232) is a magnitude +12.2 barred spiral galaxy located 180 million light-years away in the constellation Cetus.
The galaxy was discovered by German-British astronomer William Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflector at Datchet, Berkshire, on the 20th October 1784.
The galaxy was rediscovered by John Herschel in November 1834 and relisted as NGC 175
