Galaxy · Spiral
Cepheus1
Cepheus1 is a galaxy in the direction of the constellation Cepheus, 19.6 million light-years away.
| Type | Spiral |
|---|---|
| Constellation | Cepheus |
| Distance | 19.6 million light-years (6.00 Mpc) |
| Diameter | 40,200 light-years · 0.46 × the Milky Way |
| Absolute magnitude | magnitude −18.20 |
| Apparent magnitude | magnitude 10.69 |
| Luminosity | 0.083 × the Milky Way |
| Right ascension (J2000) | 20h 51m 09.7s |
| Declination (J2000) | +56° 53′ 24″ |
| Source | Updated Nearby Galaxy Catalog (Karachentsev et al. 2013) |
In the sky
A telescope is needed to see it: its apparent magnitude is 10.69. 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 20 million years ago. At that time the dinosaurs were gone and mammals were diversifying; there was no human lineage yet. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 347.1 billion years.