Planetary nebula
NGC 7009
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.
| Type | Planetary nebula |
|---|---|
| Constellation | Aquarius |
| Distance | 450 pc (1.5 thousand ly) |
| Diameter | 0.2 ly |
| Central star | V 12.8 · O(H) |
| Expansion speed | 21 km/s |
| PN G name | PN G037.7-34.5 |
| Source | Strasbourg–ESO PN Catalogue |
| Right ascension (J2000) | 21h 04m 10.8s |
| Declination (J2000) | −11° 21′ 57″ |
In the sky
Visible from the whole Southern Hemisphere and north to latitude 79° N. South of latitude 79° S 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 around the year 558. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 26 million years.