Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Canis Major |
Right ascension | 06h 36m 08.788s [1] |
Declination | −27° 37′ 20.27″ [1] |
Apparent magnitude (V) | 7.63 [2] |
Characteristics | |
Evolutionary stage | main sequence |
Spectral type | G6V [3] |
B−V color index | 0.714±0.002 [2] |
Astrometry | |
Radial velocity (Rv) | 4.238±0.0003 [4] km/s |
Proper motion (μ) |
RA: 21.582
mas/
yr
[1] Dec.: −262.843 mas/ yr [1] |
Parallax (π) | 26.7476 ± 0.0217 mas [1] |
Distance | 121.94 ± 0.10
ly (37.39 ± 0.03 pc) |
Absolute magnitude (MV) | 4.64 [2] |
Details | |
Mass | 1.05±0.01 [5] M☉ |
Radius | 1.12±0.01 [5] R☉ |
Luminosity | 1.219±0.005 [5] L☉ |
Surface gravity (log g) | 4.35±0.01 [5] cgs |
Temperature | 5,736±21 [5] K |
Metallicity [Fe/H] | 0.23 [6] dex |
Rotational velocity (v sin i) | 1.953 [6] km/s |
Age | 5.5±0.6 [5] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
HD 47186 is a star with a pair of orbiting exoplanets in the southern constellation of Canis Major. The system is located at a distance of 122 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of 4.2 km/s. [4] Although it has an absolute magnitude of 4.64, [2] at the distance of this system the apparent visual magnitude is 7.63; [2] too faint to be seen with the naked eye. It has a high proper motion, traversing the celestial sphere at an angular rate of 0.272 ″·yr−1. [8]
The spectrum of HD 47186 matches a G-type main-sequence star with a stellar classification of G6V. [3] It is an estimated 5.5 [5] billion years old and is spinning with a projected rotational velocity of 2 km/s. [6] The star has 5% greater mass and a 12% larger girth compared to the Sun. [5] The abundance of iron, a measure of the star's metallicity, is 1.7 times more than the Sun, making it metal-rich. [6] HD 47186 is radiating 1.2 times the luminosity of the Sun from its photosphere at an effective temperature of 5,736 K. [5]
Announced in June 2008, two extrasolar planets were discovered orbiting the star. Both planets are less massive than Jupiter. The inner planet HD 47186 b orbits close to the star and is termed a “ hot Neptune”. The outer planet HD 47186 c orbits in a similar distance from the star as the asteroid Vesta, at around 2.4 AU. The inner planet orbits in a circular path while the outer planet orbits in an eccentric path. [9]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | ≥0.07167 MJ | 0.050 | 4.0845 ± 0.0002 | 0.038 ± 0.020 | — | — |
c | ≥0.35061 MJ | 2.395 | 1353.6 ± 57.1 | 0.249 ± 0.073 | — | — |
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Canis Major |
Right ascension | 06h 36m 08.788s [1] |
Declination | −27° 37′ 20.27″ [1] |
Apparent magnitude (V) | 7.63 [2] |
Characteristics | |
Evolutionary stage | main sequence |
Spectral type | G6V [3] |
B−V color index | 0.714±0.002 [2] |
Astrometry | |
Radial velocity (Rv) | 4.238±0.0003 [4] km/s |
Proper motion (μ) |
RA: 21.582
mas/
yr
[1] Dec.: −262.843 mas/ yr [1] |
Parallax (π) | 26.7476 ± 0.0217 mas [1] |
Distance | 121.94 ± 0.10
ly (37.39 ± 0.03 pc) |
Absolute magnitude (MV) | 4.64 [2] |
Details | |
Mass | 1.05±0.01 [5] M☉ |
Radius | 1.12±0.01 [5] R☉ |
Luminosity | 1.219±0.005 [5] L☉ |
Surface gravity (log g) | 4.35±0.01 [5] cgs |
Temperature | 5,736±21 [5] K |
Metallicity [Fe/H] | 0.23 [6] dex |
Rotational velocity (v sin i) | 1.953 [6] km/s |
Age | 5.5±0.6 [5] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
HD 47186 is a star with a pair of orbiting exoplanets in the southern constellation of Canis Major. The system is located at a distance of 122 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of 4.2 km/s. [4] Although it has an absolute magnitude of 4.64, [2] at the distance of this system the apparent visual magnitude is 7.63; [2] too faint to be seen with the naked eye. It has a high proper motion, traversing the celestial sphere at an angular rate of 0.272 ″·yr−1. [8]
The spectrum of HD 47186 matches a G-type main-sequence star with a stellar classification of G6V. [3] It is an estimated 5.5 [5] billion years old and is spinning with a projected rotational velocity of 2 km/s. [6] The star has 5% greater mass and a 12% larger girth compared to the Sun. [5] The abundance of iron, a measure of the star's metallicity, is 1.7 times more than the Sun, making it metal-rich. [6] HD 47186 is radiating 1.2 times the luminosity of the Sun from its photosphere at an effective temperature of 5,736 K. [5]
Announced in June 2008, two extrasolar planets were discovered orbiting the star. Both planets are less massive than Jupiter. The inner planet HD 47186 b orbits close to the star and is termed a “ hot Neptune”. The outer planet HD 47186 c orbits in a similar distance from the star as the asteroid Vesta, at around 2.4 AU. The inner planet orbits in a circular path while the outer planet orbits in an eccentric path. [9]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | ≥0.07167 MJ | 0.050 | 4.0845 ± 0.0002 | 0.038 ± 0.020 | — | — |
c | ≥0.35061 MJ | 2.395 | 1353.6 ± 57.1 | 0.249 ± 0.073 | — | — |