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HD 90156

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Template:Short description

HD 90156
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Hydra[1]
Right ascension Template:RA[2]
Declination Template:DEC[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 Template:Engvar 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]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)5.17[1]
Details
Mass0.837±0.009[6] Template:Solar mass
Radius0.876±0.013[6] Template:Solar radius
Luminosity0.74±0.01[7] Template:Solar luminosity
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
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[9]
Database references
SIMBADdata
Exoplanet Archivedata

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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 Script error: No such module "val"..[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]

Planetary system

In 2011, an exoplanet was found in an eccentric orbit around the host star using Doppler spectroscopy. As the inclination of its orbital plane is unknown, only a lower bound on its mass can be determined. It has at least 18 times the mass of the Earth. The exoplanet is orbiting its host star with a separation of Script error: No such module "val". and a period of 50 days.[4]

Template:OrbitboxPlanet begin Template:OrbitboxPlanet

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See also

References

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  1. ↑ a b c d e f g h Script error: No such module "Citation/CS1".
  2. ↑ a b c d e Template:Cite Gaia DR3
  3. ↑ a b Script error: No such module "Citation/CS1".
  4. ↑ a b c d e f g Script error: No such module "Citation/CS1".
  5. ↑ a b Script error: No such module "Citation/CS1".
  6. ↑ a b c Script error: No such module "Citation/CS1".
  7. ↑ a b Script error: No such module "Citation/CS1".
  8. ↑ a b c Script error: No such module "Citation/CS1".
  9. ↑ Template:Cite simbad
  10. ↑ Script error: No such module "Citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".

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Template:Stars of Hydra

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