| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
| Parent star | ||
| Star | Kappa Coronae Borealis | |
| Constellation | Corona Borealis | |
| Right ascension | (α) | 15h 51m 13.9315s |
| Declination | (δ) | +35° 39′ 26.575″ |
| Apparent magnitude | (mV) | 4.79 |
| Distance | 101.51 ly (31.12 pc) |
|
| Spectral type | K1IVa | |
| Orbital elements | ||
| Semimajor axis | (a) | 2.68 AU (401 Gm) |
| Periastron | (q) | 2.29 AU (343 Gm) |
| Apastron | (Q) | 3.07 AU (459 Gm) |
| Eccentricity | (e) | 0.146 ± 0.08 |
| Orbital period | (P) | 1208 ± 14 d (3.307 y) |
| Argument of periastron |
(ω) | 34 ± 40° |
| Time of periastron | (T0) | 2453128 ± 30 JD |
| Semi-amplitude | (K) | 41.3 m/s |
| Physical characteristics | ||
| Minimum mass | (m sin i) | 1.8 MJ (570 M⊕) |
| Discovery information | ||
| Discovery date | Sept 20, 2007 published Nov 28, 2007 |
|
| Discoverer(s) | Johnson et al. | |
| Detection method | radial velocity | |
| Discovery status | Published | |
| Database references | ||
| Extrasolar Planets Encyclopaedia |
data | |
| SIMBAD | data | |
Kappa Coronae Borealis b is an extrasolar planet approximately 102 light years away in the constellation of Corona Borealis. This planet was discovered by Johnson et al., who used the radial velocity method to detect wobbling of the star caused by a planet move around by its tug of gravity. It was first discovered in September 2007 and was published in November.
The planet has mass of 1.8 Jupiter masses or 570 Earth masses. Although only the minimum mass is known since the inclination is not known. It orbits at a distance of 2.7 astronomical units or 400 gigameters and takes 1208 days or 3.307 years to orbit around Kappa Coronae Borealis.