Star · G7
K2-391
K2-391 is a main-sequence star of spectral type G7 in the constellation Aquarius, 1,657 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Constellation | Aquarius |
|---|---|
| Distance | 1,657 light-years (507.9 pc) |
| Apparent magnitude | magnitude 12.53 |
| Absolute magnitude | magnitude 4.00 |
| Spectral type | G7 |
| Surface temperature | 5,540 K |
| Luminosity | 2.46 L☉ |
| Radius | 0.566 R☉ |
| Mass | 0.757 M☉ |
| Metallicity [Fe/H] | -0.54 |
| Right ascension (J2000) | 23h 44m 54.2s |
| Declination (J2000) | −7° 42′ 05″ |
| Space velocity (relative to the Sun) | 21.9 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 12.53. Visible from the whole Southern Hemisphere and north to latitude 82° N. It stands highest at midnight in September, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 369. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 29 million years.
The Sun seen from there
From a planet around K2-391, the Sun would look like a star of magnitude 13.36, in the direction where our sky has the constellation Virgo. It would be invisible to the naked eye.
Planets
- K2-391 b 4.62-day orbit · 1.37 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.