Star · ?
GJ 3397
GJ 3397 is a main-sequence star of spectral type ? in the constellation Dorado, 76.7 light-years from the Sun.
| Constellation | Dorado |
|---|---|
| Distance | 76.7 light-years (23.5 pc) |
| Apparent magnitude | magnitude 13.00 |
| Absolute magnitude | magnitude 11.14 |
| Spectral type | ? |
| Surface temperature | 3,650 K |
| Luminosity | 0.0135 L☉ |
| Radius | 0.291 R☉ |
| Mass | 0.291 M☉ (estimated) |
| Right ascension (J2000) | 6h 32m 18.4s |
| Declination (J2000) | −69° 57′ 01″ |
| Space velocity (relative to the Sun) | 76.7 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 13.00. Visible from the whole Southern Hemisphere and north to latitude 20° N. South of latitude 20° S it never sets. It stands highest at midnight in December, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1949. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.4 million years.
The Sun seen from there
From a planet around GJ 3397, the Sun would look like a star of magnitude 6.69, in the direction where our sky has the constellation Draco. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- GJ 3344 9.44 light-years
- CWISE J074956.20-682722.4 10.4 light-years
- HD 39194 11.1 light-years
- HIP 31878 11.9 light-years
- GJ 3400A 12.1 light-years
- 2MASS J07180871-6415310 12.3 light-years
- GJ 3401B 12.3 light-years
- 2MASS J06395596-7418446 12.7 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.