Planetary nebula
H 1-45
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 | Sagittarius |
| Distance | 5,350 pc (17.4 thousand ly) · estimated |
| Diameter | 0.5 ly |
| Central star | V 16.8 |
| PN G name | PN G002.0-02.0 |
| Source | Strasbourg–ESO PN Catalogue |
| Right ascension (J2000) | 17h 58m 21.7s |
| Declination (J2000) | −28° 14′ 50″ |
In the sky
Visible from the whole Southern Hemisphere and north to latitude 62° N. South of latitude 62° S it never sets. It stands highest at midnight in June, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out 17 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 310 million years.