HD 16417 b (also called λ² Fornacis b) is an extrasolar planet located approximately 83 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.

HD 16417 b

HD 16417 b's orbit compared to Mercury's orbit (0.38AU) in our Solar System.
Discovery
Discovered by	O’Toole et al.
Discovery site	Anglo-Australian Observatory
Discovery date	February 23, 2009
Detection method	radial velocity
Orbital characteristics
Apastron	0.17 AU (25,000,000 km)
Periastron	0.11 AU (16,000,000 km)
Semi-major axis	0.14 ± 0.01 AU (20,900,000 ± 1,500,000 km)
Eccentricity	0.20 ± 0.09
Orbital period (sidereal)	17.24 ± 0.01 d 0.04720 ± 0.00003 y
Time of periastron	2450099.74 ± 3.3
Argument of periastron	77 ± 26
Star	HD 16417

References

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