Star · F5III
45 Aur
45 Aur is a giant star of spectral type F5III in the constellation Auriga, 200.7 light-years from the Sun.
| Other names | HIP 30247 |
|---|---|
| Constellation | Auriga |
| Distance | 200.7 light-years (61.5 pc) |
| Apparent magnitude | magnitude 5.34 |
| Absolute magnitude | magnitude 1.39 |
| Spectral type | F5III |
| Surface temperature | 6,630 K |
| Luminosity | 23.6 L☉ |
| Radius | 3.68 R☉ |
| Mass | 2.24 M☉ (estimated) |
| Right ascension (J2000) | 6h 21m 46.1s |
| Declination (J2000) | +53° 27′ 08″ |
| Space velocity (relative to the Sun) | 28.8 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.34). Visible from the whole Northern Hemisphere and south to latitude 37° S. North of latitude 37° 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 around the year 1825. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 3.6 million years.
The Sun seen from there
From a planet around 45 Aur, the Sun would look like a star of magnitude 8.78, in the direction where our sky has the constellation Telescopium. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 30230 10.8 light-years
- HIP 29580 10.8 light-years
- HIP 29113 12.6 light-years
- HIP 31267 19.0 light-years
- HIP 29873 19.1 light-years
- HIP 30605 19.3 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.