HD 30177

HD 30177
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Dorado[1]
Right ascension 04h 41m 54.374s[2]
Declination −58° 01′ 14.73″[2]
Apparent magnitude (V) 8.41[1]
Characteristics
Evolutionary stage main sequence[3]
Spectral type G8V[4]
B−V color index 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]
Distance181.0 ± 0.2 ly
(55.50 ± 0.06 pc)
Absolute magnitude (MV)4.72±0.09[3]
Details[6]
Mass1.053±0.023 M☉
Radius1.019±0.034 R☉
Luminosity1.04±0.01[7] L☉
Surface gravity (log g)4.417±0.034 cgs
Temperature5,607±47 K
Metallicity [Fe/H]0.39±0.05 dex
Rotation~45 d
Rotational velocity (v sin i)2.96±0.50[8] km/s
Age4.8±1.5 Gyr[7]
2.525±1.954[6] Gyr
Other designations
CD−58°984, HD 30177, HIP 21850, SAO 233633, 2MASS J04415438-5801146[9]
Database references
SIMBADdata

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]

  1. ^ a b c d Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Gaia DR3 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Tinney2003 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk_Cowley_1975 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 Barbato_et_al_2018 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Bonfanti2015 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Butler_et_al_2006 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. ^ González-Payo, J.; Caballero, J. A.; Gorgas, J.; Cortés-Contreras, M.; Gálvez-Ortiz, M.-C.; Cifuentes, C. (2024-07-29), Multiplicity of stars with planets in the solar neighbourhood, doi:10.48550/arXiv.2407.20138, retrieved 2024-07-30