Galaxy · Irregular
DDO 22
DDO 22 is a galaxy in the direction of the constellation Andromeda, 30.3 million light-years away.
| Type | Irregular |
|---|---|
| Constellation | Andromeda |
| Distance | 30.3 million light-years (9.30 Mpc) |
| Diameter | 15,300 light-years · 0.18 × the Milky Way |
| Absolute magnitude | magnitude −15.00 |
| Apparent magnitude | magnitude 14.84 |
| Luminosity | 0.0044 × the Milky Way |
| Right ascension (J2000) | 2h 32m 54.0s |
| Declination (J2000) | +38° 40′ 50″ |
| Source | Updated Nearby Galaxy Catalog (Karachentsev et al. 2013) |
In the sky
A telescope is needed to see it: its apparent magnitude is 14.84. Visible from the whole Northern Hemisphere and south to latitude 51° S. North of latitude 51° 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.