Star cluster
IC 4756
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 | Serpens |
| Distance | 483 pc (1.6 thousand ly) |
| Age | 617 million years |
| Member stars (MWSC) | 2,024 |
| Reddening E(B−V) | 0.21 |
| Metallicity [Fe/H] | -0.15 |
| Source | MWSC (Kharchenko et al. 2013) |
| Right ascension (J2000) | 18h 38m 56.4s |
| Declination (J2000) | +5° 27′ 00″ |
In the sky
Visible from the whole Northern Hemisphere and south to latitude 85° S. It stands highest at midnight in June, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 451. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 28 million years.