Galaxy · Spiral
DDO 123
DDO 123 is a galaxy in the direction of the constellation Ursa Major, 34.2 million light-years away.
| Type | Spiral |
|---|---|
| Constellation | Ursa Major |
| Distance | 34.2 million light-years (10.50 Mpc) |
| Diameter | 27,700 light-years · 0.32 × the Milky Way |
| Absolute magnitude | magnitude −16.30 |
| Apparent magnitude | magnitude 13.81 |
| Luminosity | 0.014 × the Milky Way |
| Right ascension (J2000) | 12h 26m 08.1s |
| Declination (J2000) | +58° 19′ 21″ |
| Source | Updated Nearby Galaxy Catalog (Karachentsev et al. 2013) |
In the sky
A telescope is needed to see it: its apparent magnitude is 13.81. Visible from the whole Northern Hemisphere and south to latitude 32° S. North of latitude 32° N it never sets. It stands highest at midnight in March, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out 34 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 607.5 billion years.