Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Pisces |
Right ascension | 00h 45m 40.3578s [1] |
Declination | +07° 50′ 42.075″ [1] |
Apparent magnitude (V) | 7.83 [2] |
Characteristics | |
Evolutionary stage | Subgiant [3] |
Spectral type | K2 IV[ citation needed] |
B−V color index | 0.963±0.017 [2] |
Astrometry | |
Radial velocity (Rv) | 14.48±0.23 [2] km/s |
Proper motion (μ) |
RA: −6.281
mas/
yr
[1] Dec.: 6.566 mas/ yr [1] |
Parallax (π) | 7.3090 ± 0.0879 mas [1] |
Distance | 446 ± 5
ly (137 ± 2 pc) |
Absolute magnitude (MV) | 2.17 [2] |
Details | |
Mass | 1.61+0.13 −0.12 [4] M☉ |
Radius | 5.15+0.18 −0.17 [5] R☉ |
Luminosity | 15.81 [2] L☉ |
Surface gravity (log g) | 3.24 [6] cgs |
Temperature | 4,966±40 [5] K |
Metallicity [Fe/H] | 0.05±0.10 [5] dex |
Rotational velocity (v sin i) | 1.91±0.25 [6] km/s |
Age | 2.03+0.64 −0.45 [5] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
HD 4313 is a star with an orbiting exoplanetary companion in the constellation of Pisces. It has an apparent visual magnitude of 7.83, [2] which is too faint to be reading visible to the unaided eye. The systam is located at a distance of 446 light years based on parallax, and is drifting further away with a radial velocity of 14.5 km/s. [2] This is a single star, which means it has no binary partners, at least in range of projected separations from 6.85 to 191.78 AU. [8] It hosts an extrasolar planet.
This is an aging K-type star with a mass of nearly twice the Sun, although different methods give mass estimates which differ as much as 0.5 M☉. [5] It is a swollen star with 5.14 times the radius of the Sun, and has a cool effective temperature of 4,966±40 k. The "IV" in the spectral class means it's a K-type subgiant [3] star which has exhausted the hydrogen at its core, and cooling and expanding to become a red giant. It is around two billion years in age and is spinning with a projected rotational velocity of 1.9 km/s.
HD 4313 has a superjovian exoplanet orbiting it. This exoplanet was discovered in 2010. [9] It is orbiting the star at a distance of 1.16 AU with an orbital period of 356 days and an eccentricity (ovalness) of 0.15. As the orbital inclination is unknown, only a lower bound on the mass can be determined. The exoplanet has at least 1.2 times the mass of Jupiter. [3]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | ≥ 1.927±0.090 MJ | 1.157±0.097 | 356.21±0.88 | 0.147±0.047 | — | 1.2 RJ |
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Pisces |
Right ascension | 00h 45m 40.3578s [1] |
Declination | +07° 50′ 42.075″ [1] |
Apparent magnitude (V) | 7.83 [2] |
Characteristics | |
Evolutionary stage | Subgiant [3] |
Spectral type | K2 IV[ citation needed] |
B−V color index | 0.963±0.017 [2] |
Astrometry | |
Radial velocity (Rv) | 14.48±0.23 [2] km/s |
Proper motion (μ) |
RA: −6.281
mas/
yr
[1] Dec.: 6.566 mas/ yr [1] |
Parallax (π) | 7.3090 ± 0.0879 mas [1] |
Distance | 446 ± 5
ly (137 ± 2 pc) |
Absolute magnitude (MV) | 2.17 [2] |
Details | |
Mass | 1.61+0.13 −0.12 [4] M☉ |
Radius | 5.15+0.18 −0.17 [5] R☉ |
Luminosity | 15.81 [2] L☉ |
Surface gravity (log g) | 3.24 [6] cgs |
Temperature | 4,966±40 [5] K |
Metallicity [Fe/H] | 0.05±0.10 [5] dex |
Rotational velocity (v sin i) | 1.91±0.25 [6] km/s |
Age | 2.03+0.64 −0.45 [5] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
HD 4313 is a star with an orbiting exoplanetary companion in the constellation of Pisces. It has an apparent visual magnitude of 7.83, [2] which is too faint to be reading visible to the unaided eye. The systam is located at a distance of 446 light years based on parallax, and is drifting further away with a radial velocity of 14.5 km/s. [2] This is a single star, which means it has no binary partners, at least in range of projected separations from 6.85 to 191.78 AU. [8] It hosts an extrasolar planet.
This is an aging K-type star with a mass of nearly twice the Sun, although different methods give mass estimates which differ as much as 0.5 M☉. [5] It is a swollen star with 5.14 times the radius of the Sun, and has a cool effective temperature of 4,966±40 k. The "IV" in the spectral class means it's a K-type subgiant [3] star which has exhausted the hydrogen at its core, and cooling and expanding to become a red giant. It is around two billion years in age and is spinning with a projected rotational velocity of 1.9 km/s.
HD 4313 has a superjovian exoplanet orbiting it. This exoplanet was discovered in 2010. [9] It is orbiting the star at a distance of 1.16 AU with an orbital period of 356 days and an eccentricity (ovalness) of 0.15. As the orbital inclination is unknown, only a lower bound on the mass can be determined. The exoplanet has at least 1.2 times the mass of Jupiter. [3]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | ≥ 1.927±0.090 MJ | 1.157±0.097 | 356.21±0.88 | 0.147±0.047 | — | 1.2 RJ |