HD 16417 b

HD 16417 b

Exoplanet		List of exoplanets
300px HD 16417 b's orbit compared to Mercury's orbit (0.38AU) in our Solar System.
Parent star
Star		HD 16417
Constellation		Fornax
Right ascension	(α)	02h 36m 58.61s
Declination	(δ)	–34° 34′ 40.7″
Apparent magnitude	(mV)	5.78
Distance		84.1 ± 0.9 ly (25.8 ± 0.3 pc)
Spectral type		G1V
Orbital elements
Semi-major axis	(a)	0.14 ± 0.01 AU
Periastron	(q)	0.11 AU
Apastron	(Q)	0.17 AU
Eccentricity	(e)	0.20 ± 0.09
Orbital period	(P)	17.24 ± 0.01 d (0.04720 ± 0.00003 y)
Argument of periastron	(ω)	77 ± 26°
Time of periastron	(T0)	2450099.74 ± 3.3 JD
Physical characteristics
Minimum mass	(m sin i)	0.069 ± 0.007 MJ (21.93 ± 2.22 M⊕)
Discovery information
Discovery date		February 23, 2009
Discoverer(s)		O’Toole et al.
Discovery method		radial velocity
Discovery site		Anglo-Australian Observatory
Discovery status		Published
Other designations
λ2 Fornacis b
Database references
Extrasolar Planets Encyclopaedia		data
SIMBAD		data
Exoplanet Archive		data
Open Exoplanet Catalogue		data

HD 16417 b (also called λ² Fornacis b) is an extrasolar planet located approximately 84 light years away in the constellation of Fornax, orbiting the 6th magnitude G-type main sequence star HD 16417. This planet has minimum mass only 7% that of Jupiter, making this a Neptune-mass planet. In addition to this, it orbits relatively close to the host star and suffers high temperature. It is the third planet discovered in Fornax constellation on February 23, 2009. This planet was discovered by a method called the radial velocity method.