Star · M5V
GJ 1245A
GJ 1245A is a main-sequence star of spectral type M5V in the constellation Cygnus, 15.3 light-years from the Sun.
| Constellation | Cygnus |
|---|---|
| Distance | 15.3 light-years (4.69 pc) |
| Apparent magnitude | magnitude 13.41 |
| Absolute magnitude | magnitude 15.05 |
| Spectral type | M5V |
| Surface temperature | 3,280 K |
| Luminosity | 7.17 × 10⁻⁴ L☉ |
| Radius | 0.0831 R☉ |
| Mass | 0.0814 M☉ (estimated) |
| Right ascension (J2000) | 19h 53m 53.7s |
| Declination (J2000) | +44° 24′ 52″ |
| Space velocity (relative to the Sun) | 13.8 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 13.41. Visible from the whole Northern Hemisphere and south to latitude 46° S. North of latitude 46° N it never sets. It stands highest at midnight in July, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 2011. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 271 thousand years.
The Sun seen from there
From a planet around GJ 1245A, the Sun would look like a star of magnitude 3.19, in the direction where our sky has the constellation Puppis. It would be visible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- GJ 1245B 0.10 light-years
- 61 Cyg 5.17 light-years
- 61 Cyg 5.17 light-years
- Struve 2398 B 5.74 light-years
- Struve 2398 A 5.74 light-years
- Kruger 60 6.99 light-years
- Gl 860B 7.00 light-years
- GJ 687 7.76 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.