HD 30177

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Template:Short description

HD 30177
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Dorado[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 8.41[1]
Characteristics
Evolutionary stage main sequence[3]
Spectral type G8V[4]
B−V Template:Engvar 0.773±0.015[1]
Astrometry
Radial velocity (Rv)62.697±0.0013[5] km/s
Proper motion (μ) RA: 66.303±0.023 mas/yr[2]
Dec.: −11.795±0.024 mas/yr[2]
Parallax (π)18.0190±0.0195 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)4.72±0.09[3]
Details[6]
Mass1.053±0.023 Template:Solar mass
Radius1.019±0.034 Template:Solar radius
Luminosity1.04±0.01[7] Template:Solar luminosity
Surface gravity (log g)4.417±0.034 cgs
Temperature5,607±47 K
Metallicity [Fe/H]0.39±0.05 dex
RotationScript error: No such module "val".
Rotational velocity (v sin i)2.96±0.50[8] km/s
AgeScript error: No such module "val".[7]
2.525±1.954[6] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[9]
Database references
SIMBADdata

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HD 30177 is a single star with a pair of orbiting exoplanets in the southern constellation Dorado. Based on parallax measurements, it is located at a distance of 181 light years from the Sun. It has an absolute magnitude of 4.72,[3] but at that distance the star is too faint to be viewed by the naked eye with an apparent visual magnitude of 8.41.[1] The star is drifting further away with a radial velocity of 62.7 km/s.[5]

The spectrum of HD 30177 matches a late G-type main-sequence star with a stellar classification of G8V.[4] It is a yellow dwarf with a mass and radius similar to the Sun that is fusing hydrogen in its core. The chromosphere shows a negligible level of magnetic activity.[3] The abundance of iron, an indicator of the star's metallicity, is more than double the Sun's. It is radiating a similar luminosity to the Sun from its photosphere at an effective temperature of 5,607 K.[6]

A 2024 multiplicity survey, using astrometry from the Gaia spacecraft, identified a proper motion companion to HD 30177. This co-moving companion is a red dwarf star, around 10% the mass of the Sun, is located at 780" from HD 30177 with a position angle of 188°. The angular distance translates to an observed separation of 43,300 astronomical units.[10]

Planetary system

The Anglo-Australian Planet Search team announced the discovery of HD 30177 b, which has a minimum mass 8 times that of Jupiter, on June 13, 2002. The scientific paper describing the discovery was published in The Astrophysical Journal in 2003.[11][3] A second massive gas giant planet was later discovered in an approximately 32 year orbit.[12] In 2022, the inclination and estimated mass of both planets were measured via astrometry.[13]

Template:OrbitboxPlanet begin Template:OrbitboxPlanet Template:OrbitboxPlanet

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See also

References

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  1. ↑ a b c d Script error: No such module "Citation/CS1".
  2. ↑ a b c d Template:Cite Gaia DR3
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  4. ↑ a b 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. ↑ 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".
  12. ↑ Script error: No such module "Citation/CS1".
  13. ↑ Script error: No such module "Citation/CS1".

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External links

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Template:Sky Template:Stars of Dorado

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