Star · M0I
K2-39
K2-39 is a supergiant star of spectral type M0I in the constellation Aquarius, 1,008 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Constellation | Aquarius |
|---|---|
| Distance | 1,008 light-years (309.0 pc) |
| Apparent magnitude | magnitude 10.98 |
| Absolute magnitude | magnitude 3.53 |
| Spectral type | M0I |
| Surface temperature | 4,880 K |
| Luminosity | 4.72 L☉ |
| Radius | 2.97 R☉ |
| Mass | 0.66 M☉ |
| Age | 6.7 billion years |
| Metallicity [Fe/H] | 0.32 |
| Right ascension (J2000) | 22h 33m 28.4s |
| Declination (J2000) | −9° 01′ 22″ |
| Space velocity (relative to the Sun) | 86.8 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 10.98. Visible from the whole Southern Hemisphere and north to latitude 81° N. It stands highest at midnight in August, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1018. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 18 million years.
The Sun seen from there
From a planet around K2-39, the Sun would look like a star of magnitude 12.28, in the direction where our sky has the constellation Leo. It would be invisible to the naked eye.
Planets
- K2-39 b 4.61-day orbit · 6.28 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.