Star · M1 V
Kepler-138
Kepler-138 is a main-sequence star of spectral type M1 V in the constellation Lyra, 218.9 light-years from the Sun. It is orbited by 4 confirmed exoplanet(s).
| Constellation | Lyra |
|---|---|
| Distance | 218.9 light-years (67.1 pc) |
| Apparent magnitude | magnitude 13.13 |
| Absolute magnitude | magnitude 9.00 |
| Spectral type | M1 V |
| Surface temperature | 3,840 K |
| Luminosity | 0.056 L☉ |
| Radius | 0.535 R☉ |
| Mass | 0.535 M☉ |
| Age | 2.2 billion years |
| Metallicity [Fe/H] | -0.18 |
| Right ascension (J2000) | 19h 21m 31.5s |
| Declination (J2000) | +43° 17′ 35″ |
| Space velocity (relative to the Sun) | 37.6 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 13.13. Visible from the whole Northern Hemisphere and south to latitude 47° S. North of latitude 47° N it never sets. It stands highest at midnight in July, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1807. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 3.9 million years.
The Sun seen from there
From a planet around Kepler-138, the Sun would look like a star of magnitude 8.96, in the direction where our sky has the constellation Puppis. It would be invisible to the naked eye.
Planets
- Kepler-138 b 10.3-day orbit · 0.64 R⊕
- Kepler-138 c 13.8-day orbit · 1.51 R⊕
- Kepler-138 d 23.1-day orbit · 1.51 R⊕
- Kepler-138 e 38.2-day orbit · 0.797 R⊕
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 95631 15.0 light-years
- Kepler-409 16.7 light-years
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.