Star · K5
GJ 3447A
GJ 3447A is a main-sequence star of spectral type K5 in the constellation Gemini, 88.0 light-years from the Sun.
| Other names | HIP 36637 |
|---|---|
| Constellation | Gemini |
| Distance | 88.0 light-years (27.0 pc) |
| Apparent magnitude | magnitude 10.98 |
| Absolute magnitude | magnitude 8.82 |
| Spectral type | K5 |
| Surface temperature | 3,950 K |
| Luminosity | 0.0765 L☉ |
| Radius | 0.591 R☉ |
| Mass | 0.526 M☉ (estimated) |
| Right ascension (J2000) | 7h 32m 02.9s |
| Declination (J2000) | +17° 19′ 10″ |
| Space velocity (relative to the Sun) | 43.0 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 10.98. Visible from the whole Northern Hemisphere and south to latitude 73° S. North of latitude 73° N it never sets. It stands highest at midnight in January, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1938. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.6 million years.
The Sun seen from there
From a planet around GJ 3447A, the Sun would look like a star of magnitude 6.99, in the direction where our sky has the constellation Sagittarius. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- GJ 3448B 7.30 light-years
- HIP 36249 7.75 light-years
- GJ 3451 7.91 light-years
- GJ 3453 8.47 light-years
- SDSS J074838.61+174332.9 11.7 light-years
- GJ 2057 11.9 light-years
- GJ 9231B 12.4 light-years
- WISEA J065958.55+171710.9 12.9 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.