Star cluster
ASCC 128
Open star cluster · 282 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 | Cassiopeia |
| Distance | 900 pc (2.9 thousand ly) |
| Age | 282 million years |
| Member stars (MWSC) | 126 |
| Reddening E(B−V) | 0.20 |
| Source | MWSC (Kharchenko et al. 2013) |
| Right ascension (J2000) | 23h 21m 07.2s |
| Declination (J2000) | +54° 40′ 12″ |
In the sky
Visible from the whole Northern Hemisphere and south to latitude 35° S. North of latitude 35° N it never sets. It stands highest at midnight in September, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around 910 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 52 million years.