Star · G9V
K2-171
K2-171 is a main-sequence star of spectral type G9V in the constellation Aquarius, 1,977 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Constellation | Aquarius |
|---|---|
| Distance | 1,977 light-years (606.1 pc) |
| Apparent magnitude | magnitude 12.75 |
| Absolute magnitude | magnitude 3.84 |
| Spectral type | G9V |
| Surface temperature | 5,250 K |
| Luminosity | 3.28 L☉ |
| Radius | 1.72 R☉ |
| Mass | 0.892 M☉ |
| Metallicity [Fe/H] | -0.09 |
| Right ascension (J2000) | 22h 09m 21.8s |
| Declination (J2000) | −13° 25′ 44″ |
| Space velocity (relative to the Sun) | 26.1 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 12.75. Visible from the whole Southern Hemisphere and north to latitude 77° N. South of latitude 77° S it never sets. 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 49. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 35 million years.
The Sun seen from there
From a planet around K2-171, the Sun would look like a star of magnitude 13.74, in the direction where our sky has the constellation Leo. It would be invisible to the naked eye.
Planets
- K2-171 b 5.63-day orbit · 2.69 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.