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 |
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]
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. [10] [3] A second massive gas giant planet was later discovered in an approximately 32 year orbit. [11] In 2022, the inclination and estimated mass of both planets were measured via astrometry. [12]
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 ° |
— |
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 |
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]
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. [10] [3] A second massive gas giant planet was later discovered in an approximately 32 year orbit. [11] In 2022, the inclination and estimated mass of both planets were measured via astrometry. [12]
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 ° |
— |