Star · M3
K2-400
K2-400 is a main-sequence star of spectral type M3 in the constellation Sextans, 204.6 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Constellation | Sextans |
|---|---|
| Distance | 204.6 light-years (62.7 pc) |
| Apparent magnitude | magnitude 15.11 |
| Absolute magnitude | magnitude 11.12 |
| Spectral type | M3 |
| Surface temperature | 3,580 K |
| Luminosity | 0.0179 L☉ |
| Radius | 0.382 R☉ |
| Mass | 0.374 M☉ |
| Metallicity [Fe/H] | -0.05 |
| Right ascension (J2000) | 10h 18m 02.6s |
| Declination (J2000) | +3° 41′ 49″ |
| Space velocity (relative to the Sun) | 22.9 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 15.11. Visible from the whole Northern Hemisphere and south to latitude 86° S. 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 1821. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 3.6 million years.
The Sun seen from there
From a planet around K2-400, the Sun would look like a star of magnitude 8.82, in the direction where our sky has the constellation Aquarius. It would be invisible to the naked eye.
Planets
- K2-400 b 3.87-day orbit · 1.16 R⊕
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 50656 12.5 light-years
- HIP 50907 13.0 light-years
- HIP 50870 16.3 light-years
- HIP 49030 18.3 light-years
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.