Planetary nebula
IC 1747
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 | Cassiopeia |
| Distance | 2,420 pc (7.9 thousand ly) |
| Diameter | 0.5 ly |
| Central star | V 15.4 · O VI |
| Expansion speed | 28 km/s |
| PN G name | PN G130.2+01.3 |
| Source | Strasbourg–ESO PN Catalogue |
| Right ascension (J2000) | 1h 57m 35.7s |
| Declination (J2000) | +63° 19′ 19″ |
In the sky
Visible from the whole Northern Hemisphere and south to latitude 27° S. North of latitude 27° N it never sets. It stands highest at midnight in October, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out 7,893 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 140 million years.