HD 30177 is an 8th magnitude star located approximately 182 light-years (56 parsecs) away in the constellation Dorado. The star is a yellow dwarf, a type of yellow star that fuses hydrogen in its core. Since if this star is a late G-type, it is cooler and less massive than the Sun, but larger in radius. It is 1.8 times older than the Sun. This star system contains two known extrasolar planets.
Observation data Epoch J2000.0 Equinox J2000.0 | |
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Constellation | Dorado |
Right ascension | 04h 41m 54.37378s[1] |
Declination | −58° 01′ 14.7277″[1] |
Apparent magnitude (V) | 8.41 |
Characteristics | |
Spectral type | G8V |
Astrometry | |
Radial velocity (Rv) | 62.63±0.12[1] km/s |
Proper motion (μ) | RA: 66.303±0.023 mas/yr[1] Dec.: −11.795±0.024 mas/yr[1] |
Parallax (π) | 18.0190 ± 0.0195 mas[1] |
Distance | 181.0 ± 0.2 ly (55.50 ± 0.06 pc) |
Absolute magnitude (MV) | 4.72 |
Details[2] | |
Mass | 1.053±0.023 M☉ |
Radius | 1.54±0.03 R☉[3] 1.019±0.034[2] R☉ |
Luminosity | 1.04 ± 0.01[3] 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 |
Age | 4.8±1.5 Gyr[3] 2.525±1.954[2] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
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.[5][6] A second massive gas giant planet was later discovered in an approximately 32 year orbit.[7] In 2022, the inclination and true mass of both planets were measured via astrometry.[8]
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° |
— |
Constellation of Dorado | |||||||||||
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