Star · ?
GJ 1230B
GJ 1230B is a main-sequence star of spectral type ? in the constellation Hercules, 32.4 light-years from the Sun.
| Constellation | Hercules |
|---|---|
| Distance | 32.4 light-years (9.94 pc) |
| Apparent magnitude | magnitude 14.00 |
| Absolute magnitude | magnitude 14.01 |
| Spectral type | ? |
| Surface temperature | 3,650 K |
| Luminosity | 9.60 × 10⁻⁴ L☉ |
| Radius | 0.0775 R☉ |
| Mass | 0.0923 M☉ (estimated) |
| Right ascension (J2000) | 18h 41m 09.0s |
| Declination (J2000) | +24° 47′ 11″ |
| Space velocity (relative to the Sun) | 23.6 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 14.00. Visible from the whole Northern Hemisphere and south to latitude 65° S. North of latitude 65° N it never sets. It stands highest at midnight in June, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1994. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 575 thousand years.
The Sun seen from there
From a planet around GJ 1230B, the Sun would look like a star of magnitude 4.82, in the direction where our sky has the constellation Canis Major. It would be visible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- GJ 1230A 0.04 light-years
- WISEPA J182831.08+265037.8 1.99 light-years
- WISEPA J181210.85+272144.3 4.02 light-years
- GJ 4070 5.00 light-years
- Gl 745A 5.26 light-years
- Gl 745B 5.27 light-years
- GJ 1232 5.72 light-years
- GJ 1235 6.27 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.