Star · G0V
HIP 21847
HIP 21847 is a main-sequence star of spectral type G0V in the constellation Perseus, 103.4 light-years from the Sun.
| Constellation | Perseus |
|---|---|
| Distance | 103.4 light-years (31.7 pc) |
| Apparent magnitude | magnitude 5.97 |
| Absolute magnitude | magnitude 3.47 |
| Spectral type | G0V |
| Surface temperature | 6,000 K |
| Luminosity | 3.68 L☉ |
| Radius | 1.78 R☉ |
| Mass | 1.39 M☉ (estimated) |
| Right ascension (J2000) | 4h 41m 50.3s |
| Declination (J2000) | +38° 16′ 48″ |
| Space velocity (relative to the Sun) | 61.1 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.97). Visible from the whole Northern Hemisphere and south to latitude 52° S. North of latitude 52° 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 1923. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.8 million years.
The Sun seen from there
From a planet around HIP 21847, the Sun would look like a star of magnitude 7.33, 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):
- PSO J071.4708+36.4930 5.58 light-years
- HIP 22576 7.71 light-years
- HIP 23080 10.8 light-years
- GJ 3297 10.9 light-years
- HIP 24243 13.7 light-years
- GJ 9168 14.0 light-years
- HIP 22776 14.4 light-years
- HIP 21832 15.7 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.