Lambda2 Fornacis

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Lambda2 Fornacis
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Fornax
Right ascension 02h 36m 58.61s[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 (Rv) 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[1] mas
Distance 84.1 ± 0.9 ly
(25.8 ± 0.3 pc)
Absolute magnitude (MV) 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
Extrasolar Planets
Encyclopaedia
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 our Sun and only 300 million years younger.

Planetary system[edit]

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 MJ 0.14 ± 0.01 17.24 ± 0.01 0.2 ± 0.09

See also[edit]

References[edit]

  1. ^ 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
  2. ^ 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 
  3. ^ 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. 

Coordinates: Sky map 02h 36m 58.6079s, −34° 34′ 40.717″