Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Canis Major |
Right ascension | 06h 24m 43.87975s [1] |
Declination | –28° 46′ 48.4163″ [1] |
Apparent magnitude (V) | 6.37 [2] |
Characteristics | |
Evolutionary stage | main sequence |
Spectral type | G2Va [3] |
Apparent magnitude (B) | 6.996 [2] |
Apparent magnitude (J) | 5.219 [4] |
Apparent magnitude (H) | 4.962 [4] |
Apparent magnitude (K) | 4.871 [4] |
B−V color index | 0.626±0.007 [2] |
Astrometry | |
Radial velocity (Rv) | −3.828±0.0003 [1] km/s |
Proper motion (μ) |
RA: −165.257
[1]
mas/
yr Dec.: −121.826 [1] mas/ yr |
Parallax (π) | 45.5224 ± 0.0320 mas [1] |
Distance | 71.65 ± 0.05
ly (21.97 ± 0.02 pc) |
Absolute magnitude (MV) | 4.67 [2] [5] |
Details | |
Mass | 1.08±0.04 [6] M☉ |
Radius | 1.05±0.02 [1] R☉ |
Luminosity | 1.178+0.002 −0.001 [1] L☉ |
Surface gravity (log g) | 4.47±0.02 [7] cgs |
Temperature | 5,862+72 −48 [1] K |
Metallicity [Fe/H] | 0.070±0.016 [6] dex |
Rotation | 20.0±0.1 d [6] |
Rotational velocity (v sin i) | 2.1 [7] km/s |
Age | 3.0+0.7 −1.4 [6] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
HD 45184 is a star in the southern constellation of Canis Major. It is a yellow-hued star near the lower limit of visibility to the naked eye with an apparent visual magnitude of 6.37. [2] The star is located at a distance of 71.65 light years from the Sun based on parallax. [1] It is drifting closer with a radial velocity of −3.8 km/s. [1]
This object is an ordinary G-type main-sequence star with a stellar classification of G2Va, [3] and it is considered a solar twin. [5] The mass, size, and luminosity of the star are slightly higher than for the Sun, and it has a near solar metallicity – what astronomers term the abundance of elements with higher atomic numbers than helium. The star is around three billion years old and is spinning with a 20-day period. [6] It has a 5.14 [9]-year magnetic activity cycle that has a lower amplitude than on the Sun. [7]
HD 45184 has a planet around 12 times as massive as Earth that takes 5.88 days to complete an orbit around its host star. This planet was detected using the radial velocity method. [10] It was later confirmed with Spitzer, whereupon a second candidate planet of similar mass was discovered orbiting with a 13.1 day period. The star was observed by Spitzer for a transit of the inner planet, but no event was detected. [11] Both Neptune-like planets have near circular orbits close to the host star. [7]
An infrared excess has been detected using the Multiband Imaging Photometer for Spitzer at a wavelength of 70 μm, making this a debris disk candidate. [12] Based upon blackbody models, it is orbiting 1.0 AU from the host star with a mean temperature of 280 K. There may be an additional, 60 K debris disk orbiting at a distance of 22.89 AU. [13]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | ≥12.19+1.06 −1.03 M🜨 |
0.0644+0.0020 −0.0021 |
5.8854±0.0003 | 0.07±0.05 | — | — |
c | ≥8.81+1.09 −1.02 M🜨 |
0.1100+0.0034 −0.0036 |
13.1354+0.0026 −0.0025 |
0.07+0.07 −0.05 |
— | — |
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Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Canis Major |
Right ascension | 06h 24m 43.87975s [1] |
Declination | –28° 46′ 48.4163″ [1] |
Apparent magnitude (V) | 6.37 [2] |
Characteristics | |
Evolutionary stage | main sequence |
Spectral type | G2Va [3] |
Apparent magnitude (B) | 6.996 [2] |
Apparent magnitude (J) | 5.219 [4] |
Apparent magnitude (H) | 4.962 [4] |
Apparent magnitude (K) | 4.871 [4] |
B−V color index | 0.626±0.007 [2] |
Astrometry | |
Radial velocity (Rv) | −3.828±0.0003 [1] km/s |
Proper motion (μ) |
RA: −165.257
[1]
mas/
yr Dec.: −121.826 [1] mas/ yr |
Parallax (π) | 45.5224 ± 0.0320 mas [1] |
Distance | 71.65 ± 0.05
ly (21.97 ± 0.02 pc) |
Absolute magnitude (MV) | 4.67 [2] [5] |
Details | |
Mass | 1.08±0.04 [6] M☉ |
Radius | 1.05±0.02 [1] R☉ |
Luminosity | 1.178+0.002 −0.001 [1] L☉ |
Surface gravity (log g) | 4.47±0.02 [7] cgs |
Temperature | 5,862+72 −48 [1] K |
Metallicity [Fe/H] | 0.070±0.016 [6] dex |
Rotation | 20.0±0.1 d [6] |
Rotational velocity (v sin i) | 2.1 [7] km/s |
Age | 3.0+0.7 −1.4 [6] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
HD 45184 is a star in the southern constellation of Canis Major. It is a yellow-hued star near the lower limit of visibility to the naked eye with an apparent visual magnitude of 6.37. [2] The star is located at a distance of 71.65 light years from the Sun based on parallax. [1] It is drifting closer with a radial velocity of −3.8 km/s. [1]
This object is an ordinary G-type main-sequence star with a stellar classification of G2Va, [3] and it is considered a solar twin. [5] The mass, size, and luminosity of the star are slightly higher than for the Sun, and it has a near solar metallicity – what astronomers term the abundance of elements with higher atomic numbers than helium. The star is around three billion years old and is spinning with a 20-day period. [6] It has a 5.14 [9]-year magnetic activity cycle that has a lower amplitude than on the Sun. [7]
HD 45184 has a planet around 12 times as massive as Earth that takes 5.88 days to complete an orbit around its host star. This planet was detected using the radial velocity method. [10] It was later confirmed with Spitzer, whereupon a second candidate planet of similar mass was discovered orbiting with a 13.1 day period. The star was observed by Spitzer for a transit of the inner planet, but no event was detected. [11] Both Neptune-like planets have near circular orbits close to the host star. [7]
An infrared excess has been detected using the Multiband Imaging Photometer for Spitzer at a wavelength of 70 μm, making this a debris disk candidate. [12] Based upon blackbody models, it is orbiting 1.0 AU from the host star with a mean temperature of 280 K. There may be an additional, 60 K debris disk orbiting at a distance of 22.89 AU. [13]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | ≥12.19+1.06 −1.03 M🜨 |
0.0644+0.0020 −0.0021 |
5.8854±0.0003 | 0.07±0.05 | — | — |
c | ≥8.81+1.09 −1.02 M🜨 |
0.1100+0.0034 −0.0036 |
13.1354+0.0026 −0.0025 |
0.07+0.07 −0.05 |
— | — |
{{
cite journal}}
: Cite journal requires |journal=
(
help)