Star · M2.5 V
K2-18
K2-18 is a main-sequence star of spectral type M2.5 V in the constellation Leo, 124.3 light-years from the Sun. It is orbited by 2 confirmed exoplanet(s).
| Constellation | Leo |
|---|---|
| Distance | 124.3 light-years (38.1 pc) |
| Apparent magnitude | magnitude 13.47 |
| Absolute magnitude | magnitude 10.57 |
| Spectral type | M2.5 V |
| Surface temperature | 3,460 K |
| Luminosity | 0.0253 L☉ |
| Radius | 0.411 R☉ |
| Mass | 0.359 M☉ |
| Metallicity [Fe/H] | 0.12 |
| Right ascension (J2000) | 11h 30m 14.4s |
| Declination (J2000) | +7° 35′ 16″ |
| Space velocity (relative to the Sun) | 28.0 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 13.47. Visible from the whole Northern Hemisphere and south to latitude 82° S. It stands highest at midnight in March, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1902. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.2 million years.
The Sun seen from there
From a planet around K2-18, the Sun would look like a star of magnitude 7.73, in the direction where our sky has the constellation Aquarius. It would be invisible to the naked eye.
Planets
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 55605 5.20 light-years
- HIP 57083 8.89 light-years
- HIP 56999 9.18 light-years
- ξ Vir 9.85 light-years
- HIP 57555 11.0 light-years
- HIP 56832 12.7 light-years
- ULAS J112059.41+121904.5 13.2 light-years
- SDSS J112615.25+012048.2 14.0 light-years
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.