Star · M2
Gl 125
Gl 125 is a supergiant star of spectral type M2 in the constellation Perseus, 316,400 light-years from the Sun.
| Other names | HIP 14669 |
|---|---|
| Constellation | Perseus |
| Distance | 316,400 light-years (97.0 kpc) |
| Apparent magnitude | magnitude 10.11 |
| Absolute magnitude | magnitude −9.82 |
| Spectral type | M2 |
| Surface temperature | 3,830 K |
| Luminosity | 2.54 × 10⁶ L☉ |
| Radius | 3,610 R☉ |
| Mass | 25 M☉ (estimated) |
| Right ascension (J2000) | 3h 09m 30.8s |
| Declination (J2000) | +45° 43′ 58″ |
| Space velocity (relative to the Sun) | 364.3 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 10.11. Visible from the whole Northern Hemisphere and south to latitude 44° S. North of latitude 44° 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 316 thousand years ago. At that time our ancestors were using stone tools; Homo sapiens did not exist yet. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 5.6 billion years.
The Sun seen from there
From a planet around Gl 125, the Sun would look like a star of magnitude 24.76, 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.