Star · F8 IV
CoRoT-21
CoRoT-21 is a main-sequence star of spectral type F8 IV in the constellation Monoceros, 4,562 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Constellation | Monoceros |
|---|---|
| Distance | 4,562 light-years (1,399 pc) |
| Apparent magnitude | magnitude 16.06 |
| Absolute magnitude | magnitude 5.33 |
| Spectral type | F8 IV |
| Surface temperature | 6,200 K |
| Luminosity | 5.07 L☉ |
| Radius | 1.95 R☉ |
| Mass | 1.29 M☉ |
| Age | 4.1 billion years |
| Metallicity [Fe/H] | 0.00 |
| Right ascension (J2000) | 6h 44m 12.6s |
| Declination (J2000) | −0° 17′ 57″ |
| Space velocity (relative to the Sun) | 77.7 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 16.06. Visible from the whole Southern Hemisphere and north to latitude 90° N. It stands highest at midnight in December, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out 4,562 years ago. At that time the first farming villages were being founded; there was no writing yet. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 81 million years.
The Sun seen from there
From a planet around CoRoT-21, the Sun would look like a star of magnitude 15.56, in the direction where our sky has the constellation Aquila. It would be invisible to the naked eye.
Planets
- CoRoT-21 b 2.72-day orbit · 14.6 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.