Star · ?
GJ 4215B
GJ 4215B is a main-sequence star of spectral type ? in the constellation Pegasus, 57.2 light-years from the Sun.
| Constellation | Pegasus |
|---|---|
| Distance | 57.2 light-years (17.5 pc) |
| Apparent magnitude | magnitude 14.81 |
| Absolute magnitude | magnitude 13.59 |
| Spectral type | ? |
| Surface temperature | 3,650 K |
| Luminosity | 0.00142 L☉ |
| Radius | 0.0942 R☉ |
| Mass | 0.109 M☉ (estimated) |
| Right ascension (J2000) | 21h 44m 08.0s |
| Declination (J2000) | +17° 04′ 34″ |
| Space velocity (relative to the Sun) | 20.8 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 14.81. 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 August, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1969. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.0 million years.
The Sun seen from there
From a planet around GJ 4215B, the Sun would look like a star of magnitude 6.05, in the direction where our sky has the constellation Hydra. It would be visible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- GJ 4214A 1.55 light-years
- HN Peg 3.03 light-years
- Gl 844 6.04 light-years
- 2MASS J22153705+2110554 8.46 light-years
- GJ 4228 9.93 light-years
- TYC 2187-512-1 9.94 light-years
- 2MASS J21522609+0937575 10.5 light-years
- Gl 824 10.7 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.