Chi2 Fornacis

For other stars with a similar Bayer designation, see χ Fornacis.
χ2 Fornacis
Location of χ2 Fornacis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Fornax
Right ascension 03h 27m 33.42119s[1]
Declination −35° 40′ 52.7728″[1]
Apparent magnitude (V) 5.70±0.01[2]
Characteristics
Spectral type K2 III[3]
B−V color index +1.29[4]
Variable type suspected[5]
Astrometry
Radial velocity (Rv)30.0±4.3[6] km/s
Proper motion (μ) RA: +77.064 mas/yr[1]
Dec.: +5.989 mas/yr[1]
Parallax (π)6.8558 ± 0.0446 mas[1]
Distance476 ± 3 ly
(145.9 ± 0.9 pc)
Absolute magnitude (MV)0.00[7]
Details
Mass1.18[8] M☉
Radius23.58±1.19[9] R☉
Luminosity194+4
−3[1] L☉
Surface gravity (log g)1.83[8] cgs
Temperature4,477±122[10] K
Metallicity [Fe/H]+0.02[11] dex
Rotational velocity (v sin i)<1.0[12] km/s
Other designations
χ2 For, 91 G. Fornacis[13], NSV 15697, CD−36°1306, CPD−36°355, FK5 2244, GC 4129, HD 21574, HIP 16112, HR 1054, SAO 194312, TIC 142889216[14]
Database references
SIMBADdata

Chi2 Fornacis, Latinized from χ2 Fornacis, is a solitary star[15] located in the southern constellation Fornax, the furnace. It is faintly visible to the naked eye as an orange-hued point of light with an apparent magnitude of 5.70. Gaia DR3 parallax measurements imply a distance of 476 light-years and it is currently receding with a heliocentric radial velocity of approximately 30 km/s.[6] At its current distance, Chi2 Fornacis' brightness is diminished by an interstellar extinction of 0.11 magnitudes[16] and it has an absolute magnitude of 0.00.[7]

Chi2 Fornacis is an old-disk star[11] and it has a stellar classification of K2 III.[3] The class indicates that it is an evolved K-type giant that has ceased hydrogen fusion at its core and left the main sequence. It has 118% the mass of the Sun[8] but it has expanded to 23.58 times the radius of the Sun.[9] It radiates 194 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 4,477 K.[10] Chi2 Fornacis is slightly metal enriched with a near-solar iron abundance of [Fe/H] = +0.02.[11] It spins too slowly for its projected rotational velocity to be measured accurately, having a projected rotational velocity lower than 1.0 km/s.[12]

The star was observed to be variable in infrared light during a 1991 IRAS survey for galaxy clusters.[17] However, its variability in optical light is unknown. In addition, subsequent observations have not confirmed the variability in infrared and optical light.[18] The lenticular galaxy NGC 1380 lies 2 degrees north-northeast of Chi2 Fornacis.[19]

  1. ^ a b c d e f Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1982 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Kervella2004 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  11. ^ a b c Cite error: The named reference Eggen1993 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference De Medeiros2014 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference Wang1991 was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference Samus2004 was invoked but never defined (see the help page).
  19. ^ O'Meara, Stephen James (2013). Deep-Sky Companions: Southern Gems. Cambridge University Press. pp. 78–80. Bibcode:2013dcsg.book.....O. ISBN 9781107015012.