HD 122430 b

HD 122430 b

Exoplanet		List of exoplanets
Parent star
Star		HD 122430
Constellation		Hydra
Right ascension	(α)	14^h 02^m 22.7815^s
Declination	(δ)	−27° 25′ 47.183″
Distance		440 ly (135 pc)
Spectral type		K3III
Orbital elements
Semi-major axis	(a)	1.02 AU (153 Gm)
Periastron	(q)	0.33 AU (49 Gm)
Apastron	(Q)	1.71 AU
Eccentricity	(e)	0.68±0.09
Orbital period	(P)	344.95±1.08 d (0.94441 y)
Orbital speed	(υ)	32.3 km/s
Argument of periastron	(ω)	91.04±17.27°
Time of periastron	(T0)	2451986.71±3.75 JD
Semi-amplitude	(K)	2.02 m/s
Physical characteristics
Minimum mass	(m sin i)	3.71 MJ (1180 M⊕)
Discovery information
Discovery date		April 14, 2003
Discoverer(s)		Setiawan et al.
Discovery method		radial velocity
Discovery site		Spain
Discovery status		Published
Database references
Extrasolar Planets Encyclopaedia		data
SIMBAD		data
Exoplanet Archive		data
Open Exoplanet Catalogue		data

HD 122430 b is a giant planet orbiting around the giant star HD 122430. It has a mass at least 3.71 times that of Jupiter. This planet located at a distance of 1.02 astronomical units away from its star, which is very similar to the Earth’s distance from the Sun. Despite of this, the higher luminosity of the star implies it is heated much more strongly than the Earth is. Its orbit is highly eccentric, around 68%. At periastron, the orbital distance from its parent star is 0.33 AU. At apastron, the distance is 1.71 AU. If this planet were in the Solar System, its orbit would range from just within Mercury’s orbit to just beyond Mars’s orbit.

In Spain, Setiawan discovered this planet in 2003, using the radial velocity method.

See also

• HD 47536 b
• HD 47536 c

References

• Setiawan, J. (2003). "Planets around evolved stars". ARI: 595–598. Bibcode:2003ESASP.539..595S.

External links

• "HD 122430". Exoplanets.

Coordinates: 14^h 02^m 22.7815^s, −27° 25′ 47.183″