Galaxy · Irregular
UGC 2172
UGC 2172 is a galaxy in the direction of the constellation Perseus, 30.3 million light-years away.
| Type | Irregular |
|---|---|
| Constellation | Perseus |
| Distance | 30.3 million light-years (9.30 Mpc) |
| Diameter | 13,500 light-years · 0.15 × the Milky Way |
| Absolute magnitude | magnitude −16.30 |
| Apparent magnitude | magnitude 13.54 |
| Luminosity | 0.014 × the Milky Way |
| Right ascension (J2000) | 2h 42m 10.8s |
| Declination (J2000) | +43° 21′ 19″ |
| Source | Updated Nearby Galaxy Catalog (Karachentsev et al. 2013) |
In the sky
A telescope is needed to see it: its apparent magnitude is 13.54. Visible from the whole Northern Hemisphere and south to latitude 47° S. North of latitude 47° 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 30 million years ago. At that time the dinosaurs were gone and mammals were diversifying; there was no human lineage yet. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 538.1 billion years.