Planetary nebula
K 1-21
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 | Puppis |
| Distance | 3,500 pc (11.4 thousand ly) · estimated |
| Diameter | 1.6 ly |
| PN G name | PN G251.1-01.5 |
| Source | Strasbourg–ESO PN Catalogue |
| Right ascension (J2000) | 8h 04m 14.5s |
| Declination (J2000) | −34° 16′ 04″ |
In the sky
Visible from the whole Southern Hemisphere and north to latitude 56° N. South of latitude 56° S it never sets. It stands highest at midnight in January, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out 11 thousand 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 203 million years.