Star · G2V
GJ 9557B
GJ 9557B is a main-sequence star of spectral type G2V in the constellation Hercules, 87.6 light-years from the Sun.
| Constellation | Hercules |
|---|---|
| Distance | 87.6 light-years (26.9 pc) |
| Apparent magnitude | magnitude 11.00 |
| Absolute magnitude | magnitude 8.86 |
| Spectral type | G2V |
| Surface temperature | 5,780 K |
| Luminosity | 0.0266 L☉ |
| Radius | 0.163 R☉ |
| Mass | 0.392 M☉ (estimated) |
| Right ascension (J2000) | 16h 19m 54.9s |
| Declination (J2000) | +39° 42′ 26″ |
| Space velocity (relative to the Sun) | 14.4 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 11.00. Visible from the whole Northern Hemisphere and south to latitude 50° S. North of latitude 50° N it never sets. It stands highest at midnight in May, 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 9557B, the Sun would look like a star of magnitude 6.97, in the direction where our sky has the constellation Horologium. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- GJ 9557A 0.47 light-years
- HIP 81919 9.00 light-years
- GJ 3948 11.3 light-years
- Gl 612 12.4 light-years
- CWISE J170127.12+415805.3 12.5 light-years
- Gl 632.1 14.1 light-years
- HIP 79512 14.1 light-years
- HIP 79837 14.4 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.