Star · K2 III
ε CrB
ε CrB is a giant star of spectral type K2 III in the constellation Corona Borealis, 241.7 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Other names | eps CrB · HIP 78159 |
|---|---|
| Constellation | Corona Borealis |
| Distance | 241.7 light-years (74.1 pc) |
| Apparent magnitude | magnitude 4.14 |
| Absolute magnitude | magnitude −0.21 |
| Spectral type | K2 III |
| Surface temperature | 4,410 K |
| Luminosity | 172 L☉ |
| Radius | 21 R☉ |
| Mass | 1.7 M☉ |
| Age | 1.7 billion years |
| Metallicity [Fe/H] | -0.09 |
| Right ascension (J2000) | 15h 57m 35.3s |
| Declination (J2000) | +26° 52′ 40″ |
| Space velocity (relative to the Sun) | 46.6 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.14). Visible from the whole Northern Hemisphere and south to latitude 63° S. North of latitude 63° N it never sets. It stands highest at midnight in May, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1784. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 4.3 million years.
The Sun seen from there
From a planet around ε CrB, the Sun would look like a star of magnitude 9.18, in the direction where our sky has the constellation Eridanus. It would be invisible to the naked eye.
Planets
- eps CrB b 418-day orbit · 12.7 R⊕
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- GJ 3930 12.7 light-years
- HIP 77291 17.1 light-years
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.