Planetary nebula
M 2-55
Planetary nebula
A shell of gas thrown off by a dying Sun-like star, glowing in the ultraviolet light of the hot core at its centre. Within a few tens of thousands of years it will disperse and fade from view. The distance is a statistical estimate, uncertain by 30–50 %.
| Type | Planetary nebula |
|---|---|
| Constellation | Cepheus |
| Distance | 1,920 pc (6.3 thousand ly) · estimated |
| Diameter | 1.2 ly |
| Central star | V 21.1 |
| PN G name | PN G116.2+08.5 |
| Source | Strasbourg–ESO PN Catalogue |
| Right ascension (J2000) | 23h 31m 51.1s |
| Declination (J2000) | +70° 22′ 14″ |
In the sky
Visible from the whole Northern Hemisphere and south to latitude 20° S. North of latitude 20° 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 6,262 years ago. At that time the first farming villages were being founded; there was no writing yet. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 111 million years.