Star · B8IV
HIP 20804
HIP 20804 is a subgiant star of spectral type B8IV in the constellation Taurus, 1,003 light-years from the Sun.
| Constellation | Taurus |
|---|---|
| Distance | 1,003 light-years (307.5 pc) |
| Apparent magnitude | magnitude 5.87 |
| Absolute magnitude | magnitude −1.57 |
| Spectral type | B8IV |
| Surface temperature | 9,550 K |
| Luminosity | 467 L☉ |
| Radius | 7.89 R☉ |
| Mass | 5.26 M☉ (estimated) |
| Right ascension (J2000) | 4h 27m 28.8s |
| Declination (J2000) | +11° 12′ 44″ |
| Space velocity (relative to the Sun) | 25.3 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.87). Visible from the whole Northern Hemisphere and south to latitude 79° S. North of latitude 79° 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 1023. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 18 million years.
The Sun seen from there
From a planet around HIP 20804, the Sun would look like a star of magnitude 12.27, in the direction where our sky has the constellation Ophiuchus. 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.