Galaxy · Spiral
NGC 931
NGC 931 is a galaxy in the direction of the constellation Triangulum, 232.6 million light-years away.
| Type | Spiral |
|---|---|
| Constellation | Triangulum |
| Distance | 232.6 million light-years (71.31 Mpc) |
| Diameter | 173,100 light-years · 2 × the Milky Way |
| Absolute magnitude | magnitude −22.13 |
| Apparent magnitude | magnitude 12.14 |
| Luminosity | 3.1 × the Milky Way |
| Right ascension (J2000) | 2h 28m 14.5s |
| Declination (J2000) | +31° 18′ 41″ |
| Source | 2MASS Redshift Survey (Huchra et al. 2012) |
In the sky
A telescope is needed to see it: its apparent magnitude is 12.14. Visible from the whole Northern Hemisphere and south to latitude 59° S. North of latitude 59° N it never sets. It stands highest at midnight in October, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out 233 million years ago. At that time complex animals were spreading through the seas and over the land; there were no dinosaurs yet. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 4,125.9 billion years.