Galaxy · Spiral
NGC 317A
NGC 317A is a galaxy in the direction of the constellation Andromeda, 246.6 million light-years away.
| Type | Spiral |
|---|---|
| Constellation | Andromeda |
| Distance | 246.6 million light-years (75.61 Mpc) |
| Diameter | 137,900 light-years · 1.6 × the Milky Way |
| Absolute magnitude | magnitude −21.56 |
| Apparent magnitude | magnitude 12.83 |
| Luminosity | 1.8 × the Milky Way |
| Right ascension (J2000) | 0h 57m 39.1s |
| Declination (J2000) | +43° 48′ 03″ |
| Source | 2MASS Redshift Survey (Huchra et al. 2012) |
In the sky
A telescope is needed to see it: its apparent magnitude is 12.83. Visible from the whole Northern Hemisphere and south to latitude 46° S. North of latitude 46° 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 247 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 4,374.6 billion years.