Star · A5
HIP 21670
HIP 21670 is a main-sequence star of spectral type A5 in the constellation Taurus, 158.1 light-years from the Sun.
| Constellation | Taurus |
|---|---|
| Distance | 158.1 light-years (48.5 pc) |
| Apparent magnitude | magnitude 5.38 |
| Absolute magnitude | magnitude 1.95 |
| Spectral type | A5 |
| Surface temperature | 7,750 K |
| Luminosity | 14.6 L☉ |
| Radius | 2.12 R☉ |
| Mass | 1.96 M☉ (estimated) |
| Right ascension (J2000) | 4h 39m 06.2s |
| Declination (J2000) | +7° 52′ 15″ |
| Space velocity (relative to the Sun) | 42.1 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.38). Visible from the whole Northern Hemisphere and south to latitude 82° 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 1868. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.8 million years.
The Sun seen from there
From a planet around HIP 21670, the Sun would look like a star of magnitude 8.26, 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 21308 10.3 light-years
- HIP 21186 11.3 light-years
- 88 Tau 11.5 light-years
- HIP 21066 11.5 light-years
- HIP 20693 12.0 light-years
- HIP 20751 12.3 light-years
- CWISE J043018.70+105857.1 13.5 light-years
- 2MASS J04241856+0637448 13.7 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.