HD 24040 b

HD 24040 b is a long-period exoplanet taking approximately 3500 days to orbit at 4.6 astronomical units in an almost circular orbit. It has a minimum mass 4 times that of Jupiter.^[1]

HD 24040 b

Discovery
Discovered by	Butler et al.
Discovery site	California, USA
Discovery date	March 12, 2006
Detection method	Doppler spectroscopy
Orbital characteristics
Semi-major axis	4.637±0.067 AU
Eccentricity	0.047±0.020[1]
Orbital period (sidereal)	3490±25[1] d
Time of periastron	2456670±240[1]
Argument of periastron	67±24[1]
Semi-amplitude	51.8±1.6[1]
Star	HD 24040

Discovery

HD 24040b was discovered in 2006 based on observations made at the W. M. Keck Observatory in Hawaii. However, because the observations covered less than one complete orbit there were only weak constraints on the period and mass.^[2] The first reliable orbit for HD 24040b was obtained by astronomers at Haute-Provence Observatory in 2012 who combined the keck measurements with ones from the SOPHIE and ELODIE spectrographs.^[3] The most recent orbit published in 2015 added additional keck measurements and refined the orbital parameters.^[1]