Star · F7V
HIP 20904
HIP 20904 is a main-sequence star of spectral type F7V in the constellation Taurus, 229.7 light-years from the Sun.
| Constellation | Taurus |
|---|---|
| Distance | 229.7 light-years (70.4 pc) |
| Apparent magnitude | magnitude 6.38 |
| Absolute magnitude | magnitude 2.14 |
| Spectral type | F7V |
| Surface temperature | 6,180 K |
| Luminosity | 12.2 L☉ |
| Radius | 3.04 R☉ |
| Mass | 1.87 M☉ (estimated) |
| Right ascension (J2000) | 4h 28m 52.0s |
| Declination (J2000) | +30° 21′ 41″ |
| Space velocity (relative to the Sun) | 43.0 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.38). Visible from the whole Northern Hemisphere and south to latitude 60° S. North of latitude 60° N it never sets. 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 1796. 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 HIP 20904, the Sun would look like a star of magnitude 9.07, in the direction where our sky has the constellation Scorpius. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 21105 6.06 light-years
- HIP 21516 9.25 light-years
- HIP 20704 10.9 light-years
- HIP 21783 11.4 light-years
- HIP 19835 13.7 light-years
- HIP 20415 15.5 light-years
- 2MASS J04144158+2809583 16.9 light-years
- HIP 21619 17.2 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.