Star · A5
21 Psc
21 Psc is a main-sequence star of spectral type A5 in the constellation Pisces, 306.6 light-years from the Sun.
| Other names | HIP 117491 |
|---|---|
| Constellation | Pisces |
| Distance | 306.6 light-years (94.0 pc) |
| Apparent magnitude | magnitude 5.77 |
| Absolute magnitude | magnitude 0.90 |
| Spectral type | A5 |
| Surface temperature | 8,430 K |
| Luminosity | 41.1 L☉ |
| Radius | 3.01 R☉ |
| Mass | 2.63 M☉ (estimated) |
| Right ascension (J2000) | 23h 49m 27.5s |
| Declination (J2000) | +1° 04′ 34″ |
| Space velocity (relative to the Sun) | 13.8 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.77). Visible from the whole Northern Hemisphere and south to latitude 89° S. It stands highest at midnight in September, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1719. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 5.4 million years.
The Sun seen from there
From a planet around 21 Psc, the Sun would look like a star of magnitude 9.70, in the direction where our sky has the constellation Virgo. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 117776 8.34 light-years
- HIP 117215 8.62 light-years
- SDSS J235841.98+000622.0 15.0 light-years
- HIP 118104 16.6 light-years
- HIP 116949 17.0 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.