Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Monoceros |
Right ascension | 06h 20m 14.32321s [1] |
Declination | −10° 43′ 30.0310″ [1] |
Apparent magnitude (V) | 7.69 [2] |
Characteristics | |
Spectral type | G3V [3] |
Apparent magnitude (B) | 8.377 [2] |
Apparent magnitude (J) | 6.509±0.029 [2] |
Apparent magnitude (H) | 6.215±0.038 [2] |
Apparent magnitude (K) | 6.115±0.017 [2] |
B−V color index | 0.687±0.007 [2] |
Astrometry | |
Radial velocity (Rv) | −12.17±0.25 [1] km/s |
Proper motion (μ) |
RA: 72.349
[1]
mas/
yr Dec.: −16.568 [1] mas/ yr |
Parallax (π) | 18.8732 ± 0.0638 mas [1] |
Distance | 172.8 ± 0.6
ly (53.0 ± 0.2 pc) |
Absolute magnitude (MV) | 4.18 [2] |
Details | |
Mass | 1.01±0.01 [4] M☉ |
Radius | 1.37±0.03 [4] R☉ |
Luminosity | 1.83±0.01 [4] L☉ |
Surface gravity (log g) | 4.17±0.02 [4] cgs |
Temperature | 5,749±45 [4] K |
Metallicity [Fe/H] | 0.04±0.01 [5] dex |
Rotational velocity (v sin i) | 1.524 [6] km/s |
Age | 5.40
[7] 9.6±0.7 [4] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
HD 44219 is a solar-type star [9] with an exoplanetary companion in the equatorial constellation of Monoceros. It has an apparent visual magnitude of 7.69, [2] making it an 8th magnitude star that is too faint to be readily visible to the naked eye. The system is located at a distance of 173 light-years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −12 km/s. [1]
This is an ordinary G-type main-sequence star with a stellar classification of G3V. [3] L. Casagrande and associates in 2011 estimated the age of the star as 5.4 billion years, [7] while A. Bonfanti and colleagues listed a much greater age of nearly 10 billion years in 2015. [4] It has a near solar metallicity and is spinning with a projected rotational velocity of 1.5 km/s. [5] The star has about the same mass as the Sun but is 37% larger in radius. It is radiating 1.83 times the luminosity of the Sun from its photosphere at an effective temperature of 5,749 K. [4]
In 2009, a Jovian planet was found in a highly eccentric orbit around the star by the HARPS planet search program. There is some evidence of an additional, longer-period companion. [9]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | ≥ 0.58+0.06 −0.04 MJ |
1.19±0.02 | 472.3+6.3 −5.0 |
0.61+0.07 −0.09 |
— | — |
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Monoceros |
Right ascension | 06h 20m 14.32321s [1] |
Declination | −10° 43′ 30.0310″ [1] |
Apparent magnitude (V) | 7.69 [2] |
Characteristics | |
Spectral type | G3V [3] |
Apparent magnitude (B) | 8.377 [2] |
Apparent magnitude (J) | 6.509±0.029 [2] |
Apparent magnitude (H) | 6.215±0.038 [2] |
Apparent magnitude (K) | 6.115±0.017 [2] |
B−V color index | 0.687±0.007 [2] |
Astrometry | |
Radial velocity (Rv) | −12.17±0.25 [1] km/s |
Proper motion (μ) |
RA: 72.349
[1]
mas/
yr Dec.: −16.568 [1] mas/ yr |
Parallax (π) | 18.8732 ± 0.0638 mas [1] |
Distance | 172.8 ± 0.6
ly (53.0 ± 0.2 pc) |
Absolute magnitude (MV) | 4.18 [2] |
Details | |
Mass | 1.01±0.01 [4] M☉ |
Radius | 1.37±0.03 [4] R☉ |
Luminosity | 1.83±0.01 [4] L☉ |
Surface gravity (log g) | 4.17±0.02 [4] cgs |
Temperature | 5,749±45 [4] K |
Metallicity [Fe/H] | 0.04±0.01 [5] dex |
Rotational velocity (v sin i) | 1.524 [6] km/s |
Age | 5.40
[7] 9.6±0.7 [4] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
HD 44219 is a solar-type star [9] with an exoplanetary companion in the equatorial constellation of Monoceros. It has an apparent visual magnitude of 7.69, [2] making it an 8th magnitude star that is too faint to be readily visible to the naked eye. The system is located at a distance of 173 light-years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −12 km/s. [1]
This is an ordinary G-type main-sequence star with a stellar classification of G3V. [3] L. Casagrande and associates in 2011 estimated the age of the star as 5.4 billion years, [7] while A. Bonfanti and colleagues listed a much greater age of nearly 10 billion years in 2015. [4] It has a near solar metallicity and is spinning with a projected rotational velocity of 1.5 km/s. [5] The star has about the same mass as the Sun but is 37% larger in radius. It is radiating 1.83 times the luminosity of the Sun from its photosphere at an effective temperature of 5,749 K. [4]
In 2009, a Jovian planet was found in a highly eccentric orbit around the star by the HARPS planet search program. There is some evidence of an additional, longer-period companion. [9]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | ≥ 0.58+0.06 −0.04 MJ |
1.19±0.02 | 472.3+6.3 −5.0 |
0.61+0.07 −0.09 |
— | — |