Star · F5I
Mirfak
Mirfak is a supergiant star of spectral type F5I in the constellation Perseus, 506.5 light-years from the Sun.
| Other names | α Per · HIP 15863 |
|---|---|
| Constellation | Perseus |
| Distance | 506.5 light-years (155.3 pc) |
| Apparent magnitude | magnitude 1.79 |
| Absolute magnitude | magnitude −4.17 |
| Spectral type | F5I |
| Surface temperature | 6,480 K |
| Luminosity | 3,970 L☉ |
| Radius | 50.1 R☉ |
| Mass | 9.7 M☉ (estimated) |
| Right ascension (J2000) | 3h 24m 19.4s |
| Declination (J2000) | +49° 51′ 40″ |
| Space velocity (relative to the Sun) | 26.1 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 1.79). Visible from the whole Northern Hemisphere and south to latitude 40° S. North of latitude 40° 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 1520. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 9.0 million years.
The Sun seen from there
From a planet around Mirfak, the Sun would look like a star of magnitude 10.79, in the direction where our sky has the constellation Lupus. 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.