Star · M0 V
GJ 338 B
GJ 338 B is a main-sequence star of spectral type M0 V in the constellation Ursa Major, 20.7 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Other names | Gl 338B · HIP 120005 |
|---|---|
| Constellation | Ursa Major |
| Distance | 20.7 light-years (6.33 pc) |
| Apparent magnitude | magnitude 7.70 |
| Absolute magnitude | magnitude 8.69 |
| Spectral type | M0 V |
| Surface temperature | 4,010 K |
| Luminosity | 0.0792 L☉ |
| Radius | 0.58 R☉ |
| Mass | 0.64 M☉ |
| Age | 4.0 billion years |
| Metallicity [Fe/H] | -0.03 |
| Right ascension (J2000) | 9h 14m 24.7s |
| Declination (J2000) | +52° 41′ 12″ |
| Space velocity (relative to the Sun) | 52.6 km/s |
In the sky
Too faint for the naked eye (magnitude 7.70); binoculars will find it. Visible from the whole Northern Hemisphere and south to latitude 37° S. North of latitude 37° N it never sets. It stands highest at midnight in February, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 2005. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 366 thousand years.
The Sun seen from there
From a planet around GJ 338 B, the Sun would look like a star of magnitude 3.84, in the direction where our sky has the constellation Indus. It would be visible to the naked eye.
Planets
- GJ 338 B b 24.4-day orbit · 3.25 R⊕
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- Gl 338A 0.00 light-years
- Gl 380 5.64 light-years
- CWISE J105512.11+544328.3 5.92 light-years
- Gl 412A 7.98 light-years
- Gl 412B 7.98 light-years
- 2MASSI J0937347+293142 8.32 light-years
- Gl 268 9.01 light-years
- GJ 3417 9.31 light-years
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.