Star · M4
GJ 3140
GJ 3140 is a supergiant star of spectral type M4 in the constellation Aries, 8,579 light-years from the Sun.
| Constellation | Aries |
|---|---|
| Distance | 8,579 light-years (2,630 pc) |
| Apparent magnitude | magnitude 12.72 |
| Absolute magnitude | magnitude 0.62 |
| Spectral type | M4 |
| Surface temperature | 3,820 K |
| Luminosity | 171 L☉ |
| Radius | 29.8 R☉ |
| Mass | 3.95 M☉ (estimated) |
| Right ascension (J2000) | 2h 10m 13.6s |
| Declination (J2000) | +11° 32′ 07″ |
| Space velocity (relative to the Sun) | 62.4 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 12.72. Visible from the whole Northern Hemisphere and south to latitude 78° S. North of latitude 78° N it never sets. It stands highest at midnight in October, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out 8,579 years ago. At that time the first farming villages were being founded; there was no writing yet. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 152 million years.
The Sun seen from there
From a planet around GJ 3140, the Sun would look like a star of magnitude 16.93, in the direction where our sky has the constellation Virgo. 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.