NGC 644

NGC 644 is a barred spiral galaxy in the constellation Phoenix in the southern sky. It is estimated to be 270 million light-years from the Milky Way and has a diameter of approximately 130,000 light-years. Together with NGC 641, it probably forms a gravitationally bound pair of galaxies. The object was discovered on September 5, 1834 by John Herschel.

Two supernovae have been observed in NGC 644: SN 2011gm (type Ia, mag. 15.8), and SN 2018cmj (type II, mag. 17.1).