Star · M2.5 V
K2-9
K2-9 is a main-sequence star of spectral type M2.5 V in the constellation Virgo, 270.6 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Constellation | Virgo |
|---|---|
| Distance | 270.6 light-years (83.0 pc) |
| Apparent magnitude | magnitude 15.83 |
| Absolute magnitude | magnitude 11.24 |
| Spectral type | M2.5 V |
| Surface temperature | 3,390 K |
| Luminosity | 0.012 L☉ |
| Radius | 0.31 R☉ |
| Mass | 0.3 M☉ |
| Age | 1.0 billion years |
| Metallicity [Fe/H] | -0.25 |
| Right ascension (J2000) | 11h 45m 03.3s |
| Declination (J2000) | +0° 00′ 19″ |
| Space velocity (relative to the Sun) | 67.9 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 15.83. Visible from the whole Southern Hemisphere and north to latitude 90° N. 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 1755. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 4.8 million years.
The Sun seen from there
From a planet around K2-9, the Sun would look like a star of magnitude 9.42, in the direction where our sky has the constellation Pisces. It would be invisible to the naked eye.
Planets
- K2-9 b 18.4-day orbit · 2.25 R⊕
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 57011 14.1 light-years
- HIP 58133 14.5 light-years
- HIP 57107 14.7 light-years
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.