HD 90156

HD 90156
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Hydra[1]
Right ascension 10h 23m 55.274s[2]
Declination –29° 38′ 43.91″[2]
Apparent magnitude (V) 6.92[1]
Characteristics
Spectral type G5 V[3]
Apparent magnitude (B) 7.579
Apparent magnitude (J) 5.685±0.023[1]
Apparent magnitude (H) 5.382±0.034[1]
Apparent magnitude (K) 5.245±0.024[1]
B−V color index 0.659±0.007[1]
Variable type None[4]
Astrometry
Radial velocity (Rv)26.958±0.0002[5] km/s
Proper motion (μ) RA: –39.159 mas/yr[2]
Dec.: 99.302 mas/yr[2]
Parallax (π)45.5628 ± 0.0214 mas[2]
Distance71.58 ± 0.03 ly
(21.95 ± 0.01 pc)
Absolute magnitude (MV)5.17[1]
Details
Mass0.837±0.009[6] M☉
Radius0.876±0.013[6] R☉
Luminosity0.74±0.01[7] L☉
Surface gravity (log g)4.40±0.02[6] cgs
Temperature5,599±12[4] K
Metallicity [Fe/H]–0.24±0.01[4] dex
Rotational velocity (v sin i)0.817[8] km/s
Age4.4 Gyr[4]
8.1±3.8[8] Gyr
Other designations
Gamma Antliae, CD–29° 8316, GJ 3597, HD 90156, HIP 50921, SAO 178771, PPM 257610[9]
Database references
SIMBADdata
Exoplanet Archivedata

HD 90156 is a star with an orbiting exoplanet in the constellation Hydra. Based on parallax measurements, it is located at a distance of 71.6 light years from the Sun.[2] The system is drifting further away with a heliocentric radial velocity of 27 km/s.[5] The apparent visual magnitude of this star is 6.92,[1] which is places it near the lower limit of visibility to the naked eye. A survey in 2015 ruled out the existence of any stellar companions at projected distances above 5 AU.[10]

This star was designated as Gamma Antliae by Lacaille, and Gould intended to keep it in the Antlia constellation. However, the delineating of constellation boundaries in 1930 saw it transferred to Hydra.[11]

The spectrum of HD 90156 presents as a G-type main-sequence star with a stellar classification of G5 V[3] It is rotating slowly with a projected rotational velocity of 0.817,[8] and it only displays a low level of magnetic activity in its chromosphere. The metallicity of the star is lower than in the Sun, indicating a paucity of elements with mass greater than helium.[4] The star has 84% of the mass of the Sun and 88% of the Sun's radius. It is radiating 74%[7] of the Sun's luminosity from its photosphere at an effective temperature of 5,599 km/s.[4]

  1. ^ a b c d e f g h 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 Gray_et_al_2006 was invoked but never defined (see the help page).
  4. ^ a b c d e f Cite error: The named reference Mordasini2011 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Soubiran_et_al_2018 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Gomes_da_Silva_et_al_2021 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Bonfanti_et_al_2016 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Costa_Silva_et_al_2020 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 Mugrauer_Ginski_2015 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Wagman2003 was invoked but never defined (see the help page).