HD 69830 c

HD 69830 c is an exoplanet orbiting HD 69830. It is the second-closest planet in its system and has a minimum mass 12 times that of Earth. Based on theoretical modeling in the 2006 discovery paper, it is likely to be a rocky planet, not a gas giant.^[1] However, other work has found that if it had formed as a gas giant, it would have stayed that way,^[3] and it is now understood that planets this massive are rarely rocky.^[4]

HD 69830 c

HD 69830 c
Discovery
Discovered by	C. Lovis et al.[1]
Discovery date	May 18, 2006
Detection method	Radial velocity
Orbital characteristics
Semi-major axis	0.181 ± 0.004 AU (27,080,000 ± 600,000 km)
Eccentricity	0.03±0.027[2]
Orbital period (sidereal)	31.6158±0.0051 d[2]
Time of periastron	2,453,469.6 ± 2.8
Argument of periastron	221 ± 35
Semi-amplitude	2.6±0.1 m/s[2]
Star	HD 69830
Physical characteristics
Mass	≥12.09+0.55 −0.54 M🜨[2]
Temperature	~522 K