Recently Hubble captured an unbarred spiral galaxy called NGC 691 that is about 130,000 light-years across. Originally discovered on November 13, 1786, by William Herschel, the galaxy is also known as UGC 1305, CGCG 482-023, MCG +04-05-019, PGC 6793.
Located about 120 million light-years from Earth in the constellation Aries, the galaxy features a multiple ring structure. Scientists have recognized three rings in infrared with diameters of 1.03, 1.67, and 2.79 arcminutes.
In Feb 2005, Yoji Hirose discovered a type Ia supernova called SN 2005W at the center of NGC 691.