Star cluster
Ruprecht 117
Open star cluster · 891 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 | Norma |
| Distance | 937 pc (3.1 thousand ly) |
| Age | 891 million years |
| Member stars (MWSC) | 25 |
| Reddening E(B−V) | 0.13 |
| Source | MWSC (Kharchenko et al. 2013) |
| Right ascension (J2000) | 16h 23m 25.8s |
| Declination (J2000) | −51° 52′ 48″ |
In the sky
Visible from the whole Southern Hemisphere and north to latitude 38° N. South of latitude 38° S it never sets. It stands highest at midnight in May, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around 1031 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 54 million years.