HD 69830 c

HD 69830 c

Exoplanet		List of exoplanets
Parent star
Star		HD 69830
Constellation		Puppis
Right ascension	(α)	08^h 18^m 23.947^s[1]
Declination	(δ)	−12° 37′ 55.81″[1]
Apparent magnitude	(mV)	5.95
Distance		40.7 ± 0.2[1] ly (12.49 ± 0.05[1] pc)
Spectral type		K0V
Mass	(m)	0.86 ± 0.03 M☉
Radius	(r)	0.89 R☉
Temperature	(T)	5385 ± 20 K
Metallicity	[Fe/H]	−0.05 ± 0.02
Age		5.1–6.1 Gyr
Orbital elements
Semi-major axis	(a)	0.186 AU
Eccentricity	(e)	0.13 ± 0.06
Orbital period	(P)	31.56 ± 0.04 d
Argument of periastron	(ω)	221 ± 35°
Time of periastron	(T0)	2,453,469.6 ± 2.8 JD
Semi-amplitude	(K)	2.66 ± 0.16 m/s
Physical characteristics
Minimum mass	(m sin i)	0.038 MJ
Temperature	(T)	~522
Discovery information
Discovery date		May 18, 2006
Discoverer(s)		Lovis et al.[2]
Discovery method		Radial velocity
Discovery status		Published[2]
Database references
Extrasolar Planets Encyclopaedia		data
SIMBAD		data
Exoplanet Archive		data
Open Exoplanet Catalogue		data

HD 69830 c is an exoplanet orbiting HD 69830. It is the second-closest planet in its system and likely to be a rocky planet, not a gas giant.^[2] If it had formed as a gas giant, it would have stayed that way.^[3]

References

1. van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.Vizier catalog entry
2. Lovis, Christophe; et al. (2006). "An extrasolar planetary system with three Neptune-mass planets" (PDF). Nature 441 (7091): 305–309. arXiv:astro-ph/0703024. Bibcode:2006Natur.441..305L. doi:10.1038/nature04828. PMID 16710412.
3. H. Lammer; et al. (2007). "The impact of nonthermal loss processes on planet masses from Neptunes to Jupiters" (PDF). Geophysical Research Abstracts 9 (7850).

Coordinates: 08^h 18^m 23.9^s, −12° 37′ 55.8″