Supernova
CTB 109 (SNR G109.1-1.0)
Supernova remnant
The shock wave of a supernova expanding at thousands of kilometres per second: it sweeps up and heats the interstellar gas and shines in radio waves.
| Type | Supernova |
|---|---|
| Constellation | Cassiopeia |
| Distance | 3,200 pc (10.4 thousand ly) |
| Diameter | 84.8 ly |
| Type | Shell type |
| Radio flux (1 GHz) | 22 Jy |
| Source | Green's SNR Catalogue |
| Right ascension (J2000) | 23h 01m 35.0s |
| Declination (J2000) | +58° 52′ 59″ |
In the sky
Visible from the whole Northern Hemisphere and south to latitude 31° S. North of latitude 31° 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 10 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 185 million years.