HD 82943

HD 82943
Observation data
Epoch J2000      Equinox J2000
Constellation Hydra[1]
Right ascension 09h 34m 50.735s[2]
Declination −12° 07′ 46.37″[2]
Apparent magnitude (V) 6.54[1]
Characteristics
Evolutionary stage main sequence[3]
Spectral type F9 V Fe+0.5[4]
B−V color index 0.623±0.001[1]
Astrometry
Radial velocity (Rv)8.102±0.0003[5] km/s
Proper motion (μ) RA: +1.440 mas/yr[2]
Dec.: −174.330 mas/yr[2]
Parallax (π)36.1158 ± 0.0264 mas[2]
Distance90.31 ± 0.07 ly
(27.69 ± 0.02 pc)
Absolute magnitude (MV)4.35[1]
Details
Mass1.14±0.01[6] M☉
Radius1.17±0.02[6] R☉
Luminosity1.54±0.02[6] L☉
Surface gravity (log g)4.35±0.01[6] cgs
Temperature5,944±18[6] K
Metallicity [Fe/H]0.265±0.008[5] dex
Rotation18.0 d[7]
Rotational velocity (v sin i)1.35±0.5[8] km/s
Age3.1±0.4[6] Gyr
Other designations
164 G. Hya, BD−11 2670, HD 82943, HIP 47007, SAO 155312[9]
Database references
SIMBADdata

HD 82943 (164 G. Hydrae) is a star with a pair of orbiting exoplanets in the equatorial constellation of Hydra. It has an apparent visual magnitude of 6.54,[1] which is near the lower limit of visibility to the naked eye. Based on parallax measurements, the distance to this system is 90.3 light years.[2] It is drifting further away with a heliocentric radial velocity of 8.1 km/s.[5] The star shows a high proper motion, traversing the celestial sphere at an angular rate of 0.194 arcsec yr−1.[10]

The spectrum of HD 82943 presents as an F-type main-sequence star[3] with a stellar classification of F9 V Fe+0.5.[4] The suffix notation indicates a mild strengthening of iron lines relative to a typical star of its type. Nonetheless, it is considered a metal-rich star,[11] having a higher abundance of many elements with masses greater than helium as compared to the Sun. This star is around 3[6] billion years old and is spinning with a rotation period of 18 days.[7] It is 14% more massive and has a 17% larger radius than the Sun. The star is radiating 154% of the luminosity of the Sun from its photosphere at an effective temperature of 5,944 K.[6]

  1. ^ a b c d e Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Kennedy_et_al_2013 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference aj132_1_161 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Soubiran_et_al_2018 was invoked but never defined (see the help page).
  6. ^ a b c d e f g h Cite error: The named reference Bonfanti_et_al_2016 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Mayor2004 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Butler2006 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Luyten1995 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Santos_et_al_2000 was invoked but never defined (see the help page).