Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Orion |
Right ascension | 06h 12m 00.567s [1] |
Declination | +06° 46′ 59.06″ [1] |
Apparent magnitude (V) | 6.85 [2] |
Characteristics | |
Evolutionary stage | Main sequence |
Spectral type | G4V [3] |
B−V color index | 0.642±0.007 [2] |
Astrometry | |
Radial velocity (Rv) | −53.52±0.14 [4] km/s |
Proper motion (μ) |
RA: 197.247
mas/
yr
[1] Dec.: −254.867 mas/ yr [1] |
Parallax (π) | 40.9764 ± 0.0240 mas [1] |
Distance | 79.60 ± 0.05
ly (24.40 ± 0.01 pc) |
Absolute magnitude (MV) | 5.03±0.06 [3] |
Details | |
Mass | 0.92±0.02 [5] M☉ |
Radius | 0.94 [5] R☉ |
Luminosity | 0.918±0.012 [5] L☉ |
Surface gravity (log g) | 4.44±0.01 [6] cgs |
Temperature | 5,758±5 K
[6] 5,765±17 [5] K |
Metallicity [Fe/H] | −0.096±0.005 dex
[6] −0.10±0.02 [5] dex |
Rotation | 16.9 d [7] |
Rotational velocity (v sin i) | 1.83±0.11 [6] km/s |
Age | 5.51±0.71 Gyr
[6] 5.5±0.2 [5] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
HD 42618 is a well-studied [7] star with an exoplanetary companion in the equatorial constellation of Orion. With an apparent visual magnitude of 6.85 [2] it is too faint to be readily visible to the naked eye. This system is located at a distance of 79.6 light years from the Sun based on parallax measurements. It has a relatively high proper motion, traversing the celestial sphere at an angular rate of 0.321 ″ per year. [9] HD 42618 is drifting closer with a radial velocity of −53.5 [4] km/s and is predicted to come as near as 42.6 light-years in around 297,000 years. [2]
The stellar classification of HD 42618 is G4V, [3] which shows it to be an ordinary G-type main-sequence star. It is considered a close solar analog, which means the physical properties of the star are particularly similar to those of the Sun. [10] Seismic model indicates the star is older and more evolved than the Sun with an age of about 5.5 billion years. [5] It is spinning with a low projected rotational velocity of 1.8 km/s, [6] with the rotation rate being consistent with the star's low activity level. [11] The star has 92% of the mass of the Sun and 94% of the Sun's radius. The surface metallicity is lower than in the Sun, [5] with the abundance patterns being consistent with a solar-type star. [11] HD 42618 is radiating 92% of the luminosity of the Sun from its photosphere at an effective temperature of 5,765 K. [5]
In 2016, the discovery of a candidate exoplanet companion orbiting HD 42618 was announced. Designated HD 42618 b, it was found using the radial velocity method which showed a periodicity of 149.6 days. The orbital elements have the planet orbiting at a distance of 0.55 AU from the host star with an orbital eccentricity (ovalness) of 0.2 and a Neptune-like mass. A second signal with a period of 388 days was detected, but this is unconfirmed and may be false. A 4,850 day signal is likely the result of star's magnetic activity cycle. [7]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | ≥ 14.4+2.5 −2.4 M🜨 |
0.554±0.011 | 149.61+0.37 −0.34 |
0.19+0.15 −0.12 |
— | — |
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Orion |
Right ascension | 06h 12m 00.567s [1] |
Declination | +06° 46′ 59.06″ [1] |
Apparent magnitude (V) | 6.85 [2] |
Characteristics | |
Evolutionary stage | Main sequence |
Spectral type | G4V [3] |
B−V color index | 0.642±0.007 [2] |
Astrometry | |
Radial velocity (Rv) | −53.52±0.14 [4] km/s |
Proper motion (μ) |
RA: 197.247
mas/
yr
[1] Dec.: −254.867 mas/ yr [1] |
Parallax (π) | 40.9764 ± 0.0240 mas [1] |
Distance | 79.60 ± 0.05
ly (24.40 ± 0.01 pc) |
Absolute magnitude (MV) | 5.03±0.06 [3] |
Details | |
Mass | 0.92±0.02 [5] M☉ |
Radius | 0.94 [5] R☉ |
Luminosity | 0.918±0.012 [5] L☉ |
Surface gravity (log g) | 4.44±0.01 [6] cgs |
Temperature | 5,758±5 K
[6] 5,765±17 [5] K |
Metallicity [Fe/H] | −0.096±0.005 dex
[6] −0.10±0.02 [5] dex |
Rotation | 16.9 d [7] |
Rotational velocity (v sin i) | 1.83±0.11 [6] km/s |
Age | 5.51±0.71 Gyr
[6] 5.5±0.2 [5] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
HD 42618 is a well-studied [7] star with an exoplanetary companion in the equatorial constellation of Orion. With an apparent visual magnitude of 6.85 [2] it is too faint to be readily visible to the naked eye. This system is located at a distance of 79.6 light years from the Sun based on parallax measurements. It has a relatively high proper motion, traversing the celestial sphere at an angular rate of 0.321 ″ per year. [9] HD 42618 is drifting closer with a radial velocity of −53.5 [4] km/s and is predicted to come as near as 42.6 light-years in around 297,000 years. [2]
The stellar classification of HD 42618 is G4V, [3] which shows it to be an ordinary G-type main-sequence star. It is considered a close solar analog, which means the physical properties of the star are particularly similar to those of the Sun. [10] Seismic model indicates the star is older and more evolved than the Sun with an age of about 5.5 billion years. [5] It is spinning with a low projected rotational velocity of 1.8 km/s, [6] with the rotation rate being consistent with the star's low activity level. [11] The star has 92% of the mass of the Sun and 94% of the Sun's radius. The surface metallicity is lower than in the Sun, [5] with the abundance patterns being consistent with a solar-type star. [11] HD 42618 is radiating 92% of the luminosity of the Sun from its photosphere at an effective temperature of 5,765 K. [5]
In 2016, the discovery of a candidate exoplanet companion orbiting HD 42618 was announced. Designated HD 42618 b, it was found using the radial velocity method which showed a periodicity of 149.6 days. The orbital elements have the planet orbiting at a distance of 0.55 AU from the host star with an orbital eccentricity (ovalness) of 0.2 and a Neptune-like mass. A second signal with a period of 388 days was detected, but this is unconfirmed and may be false. A 4,850 day signal is likely the result of star's magnetic activity cycle. [7]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | ≥ 14.4+2.5 −2.4 M🜨 |
0.554±0.011 | 149.61+0.37 −0.34 |
0.19+0.15 −0.12 |
— | — |