Star · B5V
31 Tau
31 Tau is a main-sequence star of spectral type B5V in the constellation Taurus, 728.7 light-years from the Sun.
| Other names | HIP 18089 |
|---|---|
| Constellation | Taurus |
| Distance | 728.7 light-years (223.4 pc) |
| Apparent magnitude | magnitude 5.66 |
| Absolute magnitude | magnitude −1.09 |
| Spectral type | B5V |
| Surface temperature | 9,590 K |
| Luminosity | 301 L☉ |
| Radius | 6.29 R☉ |
| Mass | 4.64 M☉ (estimated) |
| Right ascension (J2000) | 3h 52m 00.2s |
| Declination (J2000) | +6° 32′ 05″ |
| Space velocity (relative to the Sun) | 18.1 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.66). Visible from the whole Northern Hemisphere and south to latitude 83° S. It stands highest at midnight in November, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1297. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 13 million years.
The Sun seen from there
From a planet around 31 Tau, the Sun would look like a star of magnitude 11.58, in the direction where our sky has the constellation Libra. It would be invisible to the naked eye.
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.