Star · G8III
109 Tau
109 Tau is a giant star of spectral type G8III in the constellation Taurus, 232.8 light-years from the Sun.
| Other names | HIP 24822 |
|---|---|
| Constellation | Taurus |
| Distance | 232.8 light-years (71.4 pc) |
| Apparent magnitude | magnitude 4.96 |
| Absolute magnitude | magnitude 0.69 |
| Spectral type | G8III |
| Surface temperature | 4,900 K |
| Luminosity | 65.2 L☉ |
| Radius | 11.2 R☉ |
| Mass | 3 M☉ (estimated) |
| Right ascension (J2000) | 5h 19m 16.6s |
| Declination (J2000) | +22° 05′ 47″ |
| Space velocity (relative to the Sun) | 31.2 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.96). Visible from the whole Northern Hemisphere and south to latitude 68° S. North of latitude 68° 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 1793. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 4.1 million years.
The Sun seen from there
From a planet around 109 Tau, the Sun would look like a star of magnitude 9.10, in the direction where our sky has the constellation Ophiuchus. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 24283 10.3 light-years
- HIP 24663 10.7 light-years
- HIP 24543 13.7 light-years
- HIP 24113 14.9 light-years
- HIP 25400 17.4 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.