Lambda2 Fornacis

For other stars with this Bayer designation, see λ 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 58.6079s[1]
Declination −34° 34′ 40.714″[1]
Apparent magnitude (V) 5.78[2]
Characteristics
Spectral type G1V[3]
B−V color index +0.653±0.005[2]
Astrometry
Radial velocity (Rv)+11.80±0.65[2] km/s
Proper motion (μ) RA: −18.507±0.065[1] mas/yr
Dec.: −258.869±0.089[1] mas/yr
Parallax (π)39.3512 ± 0.0543 mas[1]
Distance82.9 ± 0.1 ly
(25.41 ± 0.04 pc)
Absolute magnitude (MV)3.74±0.04[4]
Details
A
Mass1.18±0.04[4] M☉
Radius1.50±0.05[4] R☉
Luminosity3.03[2] L☉
Surface gravity (log g)4.12±0.03[4] cgs
Temperature5,936[4] K
Metallicity [Fe/H]+0.19[4] dex
Rotational velocity (v sin i)1.4 or 3.2[5] km/s
Age4.34±0.82[4] Gyr
B
Mass0.11[6] M☉
Other designations
λ2 For, CD–35°903, Gaia DR2 5062172841616745856, GC 3153, GJ 105.1, HD 16417, HIP 12186, HR 772, SAO 193811, PPM 278138, LTT 1280, NLTT 8516, GCRV 1481, 2MASS J02365859-3434404[7]
Database references
SIMBADdata
Exoplanet Archivedata
ARICNSdata

λ2 Fornacis, Latinized as Lambda2 Fornacis, is the primary of a binary star system in the southern constellation of Fornax. It is just visible to the naked eye as a dim, yellow-hued point of light with an apparent visual magnitude of 5.78.[2] It is located 83 light years distant from the Sun, based on stellar parallax,[1] and is drifting further away with a radial velocity of +12 km/s.[2]

This object is a G-type main-sequence star with a stellar classification of G1V.[3] It is considered a solar analog, being photometrically-similar to the Sun.[8] The star is an estimated 4.3[4] billion years old with 1.2 times the mass of the Sun and 1.5 times the Sun's radius.[4] It is radiating three[2] times the luminosity of the Sun from its photosphere at an effective temperature of 5,936 K.[4] The abundance of elements with more mass than helium is 55% higher than in the Sun.[4][9]

There is a faint co-moving companion star located to the east of the main star at an angular separation of 45″. This is most likely an M5–M6 class red dwarf with 0.11 times the Sun's mass. The projected separation between the pair is about 1,000 AU.[6]

  1. ^ a b c d e f Cite error: The named reference Gaia DR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f g Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Gray2006 was invoked but never defined (see the help page).
  4. ^ a b c d e f g h i j k Cite error: The named reference aaa458_2_609 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Soto2018 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Mugrauer2014 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Datson2015 was invoked but never defined (see the help page).
  9. ^ 10+0.19 = 1.55