NGC 660

Alt. Designations: NGC 660
Object Type: barred spiral galaxy
Constellation: Pisces
Distance: 24 mly
Right Ascension: 01h 43m 01.8s
Declination: +13° 38´ 37"
Visual Magnitude: 10.7
Apparent Dimension: 8.3´ X 3.2´
Best Month To View: Oct

NGC 660 lies near the center of this field of galaxies within the boundaries of the constellation Pisces. Over 20 million light-years away, its peculiar appearance marks it as a polar ring galaxy. A rare galaxy type, polar ring galaxies have a substantial population of stars, gas, and dust orbiting in rings nearly perpendicular to the plane of a flat galactic disk. The bizarre configuration could have been caused by the chance capture of material from a passing galaxy by the disk galaxy, with the captured debris strung out in a rotating ring. Polar Ring galaxies can be used to explore the shape of the galaxy's otherwise unseen dark matter halo by calculating the dark matter's gravitational influence on the rotation of the ring and disk. Broader than the disk, NGC 660's ring spans about 40,000 light-years.