HD 6434

HD 6434 / Nenque
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Phoenix[1]
Right ascension 01h 04m 40.15037s[2]
Declination –39° 29′ 17.5856″[2]
Apparent magnitude (V) 7.71±0.12[3]
Characteristics
Spectral type G2/G3V[4]
B−V color index 0.61±0.01[3]
Astrometry
Radial velocity (Rv)+22.92±0.14[2] km/s
Proper motion (μ) RA: −170.124±0.106[2] mas/yr
Dec.: −527.851±0.078[2] mas/yr
Parallax (π)23.5794 ± 0.0417 mas[2]
Distance138.3 ± 0.2 ly
(42.41 ± 0.08 pc)
Absolute magnitude (MV)4.69[5]
Details[6]
Mass0.83±0.03 M☉
Radius1.029±0.004 R☉
Luminosity1.208±0.004 L☉
Surface gravity (log g)4.31±0.01 cgs
Temperature5,907±71 K
Metallicity [Fe/H]−0.48±0.05[3] dex
Rotation18.6 d[7]
Rotational velocity (v sin i)2.2±0.5[3] km/s
Age12.2±0.8 Gyr
Other designations
CD–40°239, GJ 9037, HD 6434, HIP 5054, SAO 192911, LFT 102, LHS 1188, LPM 57, LTT 610, GCRV 51158, 2MASS J01044015-3929173[8]
Database references
SIMBADdata
ARICNSdata

HD 6434 is a star in the southern constellation of Phoenix. Yellow dwarfs such as this are not very luminous, so at a distance of 138[2] light years it is not visible to the unaided eye. However, with binoculars it is readily visible under ideal observing conditions, having an apparent visual magnitude of 7.71.[3] The star is drifting further from the Sun with a radial velocity of +23 km/s.[2]

The star HD 6434 is named Nenque. The name was selected in the NameExoWorlds campaign by Ecuador, during the 100th anniversary of the IAU. Nenque means the Sun in the language spoken by the Indigenous Waorani tribes.[9][10]

This object is a Sun-like G-type main-sequence star with a stellar classification of G2/G3V.[4] It is an ancient population II[11] star with an estimated age of 12[6] billion years, and is one of the most metal-deficient stars known to host a planet.[3] This star is spinning at a leisurely rate with a projected rotational velocity of 2.2 km/s.[3] It has 88% of the mass of the Sun but is nearly the same size. HD 6434 is radiating 1.2 times the luminosity of the Sun from its photosphere at an effective temperature of 5,907 K.[6]

  1. ^ Cite error: The named reference Roman1987 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h Cite error: The named reference Gaia DR2 was invoked but never defined (see the help page).
  3. ^ a b c d e f g Cite error: The named reference Hinkel2015 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference White2007 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Barbieri2002 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Bonfanti2015 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Mayor2004 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ "Approved names". NameExoworlds. Retrieved 2020-01-02.
  10. ^ "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
  11. ^ Cite error: The named reference Fuhrmann2019 was invoked but never defined (see the help page).