Star cluster
Ruprecht 1
Open star cluster · 617 million years
An open cluster of stars born together from the same gas cloud in the Milky Way’s disc; the Galaxy’s tidal forces will disperse it within a few hundred million years. Position, distance, age and member count come from the MWSC catalogue; the total brightness is roughly estimated from the member count.
| Type | Star cluster |
|---|---|
| Constellation | Canis Major |
| Distance | 1,204 pc (3.9 thousand ly) |
| Age | 617 million years |
| Member stars (MWSC) | 71 |
| Reddening E(B−V) | 0.15 |
| Source | MWSC (Kharchenko et al. 2013) |
| Right ascension (J2000) | 6h 36m 32.4s |
| Declination (J2000) | −14° 11′ 35″ |
In the sky
Visible from the whole Southern Hemisphere and north to latitude 76° N. South of latitude 76° S it never sets. It stands highest at midnight in December, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around 1902 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 70 million years.