Kappa Coronae Borealis

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Kappa Coronae Borealis
Observation data
Epoch J2000.0
Constellation
(pronunciation)		 Corona Borealis
Right ascension 15h 51m 13.93s
Declination +35° 39′ 26.57″
Apparent magnitude (V) +4.82
Absolute magnitude (V) +2.35
Distance 101.51 ly
(31.12 pc)
Spectral type K1IVa
Other designations

Kappa Coronae Borealis is a star in Corona Borealis constellation, located at a distance of 31.12 parsecs or 101.51 light years away from the Sun. The apparent magnitude is +4.82 (4.17 trillion times fainter than the Sun) and the absolute magnitude is +2.35 (9.82 times brighter than the Sun). It is an orange K-type subgiant star, meaning it has nearly completely exhausted its hydrogen supply in its core.

Contents

[edit] Kappa Coronae Borealis b

Kappa Coronae Borealis b
Extrasolar planet List of extrasolar planets
Orbital elements
Semimajor axis (a) 2.68 AU
Eccentricity (e) 0.146 ± 0.08
Orbital period (P) 1208 ± 14 d
Angular distance (θ) 87 mas
Longitude of
periastron		 (ω) 34 ± 40°
Time of periastron (T0) 2453128 ± 30 JD
Semi-amplitude (K) 41.3 m/s
Physical characteristics
Mass (m) >1.8 MJ
Discovery information
Discovery date Sept 20, 2007
published Nov 28, 2007
Discoverer(s) Johnson et al.
Detection method radial velocity
Discovery status Published

Kappa Coronae Borealis b is a jovian planet discovered by Johnson et al., who used 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 mass or 570 Earth mass. 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.

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