Star · K3V
K2-81
K2-81 is a main-sequence star of spectral type K3V in the constellation Taurus, 823.0 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Constellation | Taurus |
|---|---|
| Distance | 823.0 light-years (252.3 pc) |
| Apparent magnitude | magnitude 14.31 |
| Absolute magnitude | magnitude 7.30 |
| Spectral type | K3V |
| Surface temperature | 4,670 K |
| Luminosity | 0.27 L☉ |
| Radius | 0.635 R☉ |
| Mass | 0.745 M☉ |
| Right ascension (J2000) | 3h 49m 56.5s |
| Declination (J2000) | +14° 30′ 07″ |
| Space velocity (relative to the Sun) | 44.1 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 14.31. Visible from the whole Northern Hemisphere and south to latitude 75° S. North of latitude 75° N it never sets. It stands highest at midnight in November, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1203. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 15 million years.
The Sun seen from there
From a planet around K2-81, the Sun would look like a star of magnitude 11.84, in the direction where our sky has the constellation Libra. It would be invisible to the naked eye.
Planets
- K2-81 b 6.1-day orbit · 1.97 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.