Star · F0V
57 Per
57 Per is a main-sequence star of spectral type F0V in the constellation Perseus, 199.2 light-years from the Sun.
| Other names | HIP 21242 |
|---|---|
| Constellation | Perseus |
| Distance | 199.2 light-years (61.1 pc) |
| Apparent magnitude | magnitude 6.09 |
| Absolute magnitude | magnitude 2.16 |
| Spectral type | F0V |
| Surface temperature | 7,040 K |
| Luminosity | 11.6 L☉ |
| Radius | 2.29 R☉ |
| Mass | 1.85 M☉ (estimated) |
| Right ascension (J2000) | 4h 33m 24.9s |
| Declination (J2000) | +43° 03′ 50″ |
| Space velocity (relative to the Sun) | 22.7 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.09). Visible from the whole Northern Hemisphere and south to latitude 47° S. North of latitude 47° 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 1827. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 3.5 million years.
The Sun seen from there
From a planet around 57 Per, the Sun would look like a star of magnitude 8.76, in the direction where our sky has the constellation Norma. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 21680 8.93 light-years
- HIP 21301 10.6 light-years
- HIP 21915 17.3 light-years
- HIP 18994 19.2 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.