Star cluster
IRAS 21388+5622
Open star cluster · 191 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 | Cepheus |
| Distance | 7,061 pc (23.0 thousand ly) |
| Age | 191 million years |
| Member stars (MWSC) | 48 |
| Reddening E(B−V) | 1.42 |
| Source | MWSC (Kharchenko et al. 2013) |
| Right ascension (J2000) | 21h 40m 43.3s |
| Declination (J2000) | +56° 35′ 53″ |
In the sky
Visible from the whole Northern Hemisphere and south to latitude 33° S. North of latitude 33° N it never sets. It stands highest at midnight in August, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out 23 thousand years ago. At that time Homo sapiens was spreading out of Africa; there was no farming yet. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 409 million years.