Lambda² Fornacis

Lambda² Fornacis
	; λ2 Fornacis on the right of the Fornax Dwarf Galaxy; Credit: ESO/Digitized Sky Survey 2
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Fornax
Right ascension	02h 36m 58.61s
Declination	–34° 34′ 40.7″
Apparent magnitude (V)	5.78
Characteristics
Spectral type	G1V
B−V color index	0.67
Astrometry
Radial velocity (Rv)	10.3 ± 2 km/s
Proper motion (μ)	RA: –18.35 ± 0.22 mas/yr ; Dec.: –259.35 ± 0.27 mas/yr
Parallax (π)	38.79 ± 0.40 mas
Distance	84.1 ± 0.9 ly ; (25.8 ± 0.3 pc)
Absolute magnitude (MV)	3.74 ± 0.04
Details
Mass	1.18 ± 0.04 M☉
Radius	1.50 ± 0.05 R☉
Surface gravity (log g)	4.12 ± 0.03 cgs
Temperature	5,936 K
Metallicity [Fe/H]	+0.19 dex
Age	4.34 ± 0.82 Gyr
Other designations
	HD 16417, CD–35° 903, GC 3153, GCRV 1481, Gliese 105.1, HIP 12186, HR 772, LTT 1280, NLTT 8516, PPM 278138, SAO 193811, Wo 9088
Database references
SIMBAD	data
Exoplanet Archive	data
ARICNS	data

Lambda² Fornacis (also called HD 16417) is a 6th magnitude G-type main sequence star located approximately 84 light years away in the constellation of Fornax. It is more massive, hotter, and more metal-rich than the Sun and 300 million years younger.

Planetary system

Precision Doppler spectroscopy from an intensive 48 night observing campaign on the Anglo-Australian Telescope has revealed the presence of a low-mass extrasolar planet orbiting the star.^[3]

The Lambda2 Fornacis planetary system^[3]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	≥0.069 ± 0.007 $M$ _J	0.14 ± 0.01	17.24 ± 0.01	0.2 ± 0.09	—	—

^ ^a ^b ^c ^d ^e 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
^ ^a ^b ^c ^d ^e ^f ^g da Silva, L.; et al. (November 2006), "Basic physical parameters of a selected sample of evolved stars", Astronomy and Astrophysics, 458 (2): 609–623, arXiv:astro-ph/0608160, Bibcode:2006A&A...458..609D, doi:10.1051/0004-6361:20065105
^ ^a ^b O’Toole, Simon; et al. (2009). "A Neptune-mass Planet Orbiting the Nearby G Dwarf HD16417". The Astrophysical Journal. 697 (2): 1263–1268. arXiv:0902.4024. Bibcode:2009ApJ...697.1263O. doi:10.1088/0004-637X/697/2/1263.

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Observation data Epoch J2000.0 Equinox J2000.0
λ² Fornacis on the right of the Fornax Dwarf Galaxy Credit: ESO/Digitized Sky Survey 2
Constellation	Fornax
Right ascension	02^h 36^m 58.61^s^[1]
Declination	–34° 34′ 40.7″^[1]
Apparent magnitude (V)	5.78
Characteristics
Spectral type	G1V
B−V color index	0.67
Astrometry

Radial velocity (R_v)	10.3 ± 2 km/s
Proper motion (μ)	RA: –18.35 ± 0.22^[1] mas/yr Dec.: –259.35 ± 0.27^[1] mas/yr
Parallax (π)	38.79 ± 0.40 mas^[1]
Distance	84.1 ± 0.9 ly (25.8 ± 0.3 pc)
Absolute magnitude (M_V)	3.74 ± 0.04^[2]

Details

Mass	1.18 ± 0.04^[2] `M`_☉
Radius	1.50 ± 0.05^[2] `R`_☉
Surface gravity (log g)	4.12 ± 0.03^[2] cgs
Temperature	5,936^[2] K
Metallicity [Fe/H]	+0.19^[2] dex
Age	4.34 ± 0.82^[2] Gyr

Other designations
HD 16417, CD–35° 903, GC 3153, GCRV 1481, Gliese 105.1, HIP 12186, HR 772, LTT 1280, NLTT 8516, PPM 278138, SAO 193811, Wo 9088
Database references
SIMBAD	data
Exoplanet Archive	data
ARICNS	data