Supernova
HB9 (SNR G160.9+2.6)
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. The distance is estimated from the radio surface-brightness–diameter (Σ–D) relation and may be off by a factor of two.
| Type | Supernova |
|---|---|
| Constellation | Auriga |
| Distance | 1,740 pc (5.7 thousand ly) · estimated |
| Diameter | 213.3 ly |
| Type | Shell type |
| Radio flux (1 GHz) | 110 Jy |
| Source | Green's SNR Catalogue |
| Right ascension (J2000) | 5h 00m 60.0s |
| Declination (J2000) | +46° 40′ 00″ |
In the sky
Visible from the whole Northern Hemisphere and south to latitude 43° S. North of latitude 43° N it never sets. It stands highest at midnight in December, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out 5,675 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 101 million years.