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Star in the constellation Dorado From Wikipedia, the free encyclopedia
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]
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] |
Distance | 181.0 ± 0.2 ly (55.50 ± 0.06 pc) |
Absolute magnitude (MV) | 4.72±0.09[3] |
Details[6] | |
Mass | 1.053±0.023 M☉ |
Radius | 1.019±0.034 R☉ |
Luminosity | 1.04±0.01[7] L☉ |
Surface gravity (log g) | 4.417±0.034 cgs |
Temperature | 5,607±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 |
Age | 4.8±1.5 Gyr[7] 2.525±1.954[6] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
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]
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]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (years) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 8.403+1.241 −0.489 MJ |
3.604+0.135 −0.147 |
6.884+0.014 −0.012 |
0.207+0.012 −0.017 |
85.393+14.354 −18.742° |
— |
c | 6.150+1.308 −0.341 MJ |
10.258+0.535 −0.480 |
33.088+1.596 −1.207 |
0.039+0.005 −0.013 |
98.016+16.025 −24.235° |
— |
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