Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Horologium |
Right ascension | 04h 19m 45.46920s [1] |
Declination | –41° 57′ 36.9527″ [1] |
Apparent magnitude (V) | 8.243±0.012 [2] |
Characteristics | |
Spectral type | G3IV [2] |
B−V color index | 0.721±0.009 [2] |
Astrometry | |
Radial velocity (Rv) | 21.04±0.13 [1] km/s |
Proper motion (μ) |
RA: –41.139
mas/
yr
[1] Dec.: –91.908 mas/ yr [1] |
Parallax (π) | 19.9263 ± 0.0160 mas [1] |
Distance | 163.7 ± 0.1
ly (50.18 ± 0.04 pc) |
Absolute magnitude (MV) | 4.97 [3] |
Details [2] | |
Mass | 0.944±0.032 M☉ |
Radius | 0.923±0.033 R☉ |
Luminosity | 0.97 [3] L☉ |
Surface gravity (log g) | 4.455±0.038 cgs |
Temperature | 5,737±36 K |
Metallicity [Fe/H] | −0.12±0.05 dex |
Rotation | ~31 d |
Age | 4.010±2.892 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
HD 27631 is a star with an orbiting exoplanet in the southern constellation of Horologium. It is too faint to be visible to the naked eye, having an apparent visual magnitude of 8.24. [2] The distance to this system is 164 light years based on parallax measurements. It is drifting further away with a radial velocity of 21 km/s. [1]
This is a G-type star with a stellar classification of G3IV, [2] suggesting it is a subgiant star that is evolving off the main sequence after exhausting the supply of hydrogen at its core. It is smaller than the Sun, with 94% of its mass and 92% of the radius. [2] The star is radiating 97% [3] of the luminosity of the Sun from its photosphere at an effective temperature of 5,737 K. [2] The estimated age is roughly 4.4 billion years [5] and it is spinning slowly with a rotation period of around 31 days. [2]
A survey in 2015 has ruled out the existence of any stellar companions at projected distances above 40 astronomical units. [6]
From 1998 to 2012, the star was under observation from the CORALIE echelle spectrograph at La Silla Observatory. In 2012, a long-period, wide-orbiting exoplanet was deduced by radial velocity. This was published in November. [5] In 2023, the inclination and true mass of HD 27631 b were determined via astrometry. [7] This is a super-jovian planet with around 1.6 times the mass of Jupiter. It is orbiting the host star at a separation of 3.22 AU with an eccentricity (ovalness) of 0.16 and an orbital period of six years.
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( years) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 1.56+0.2 −0.15 MJ |
3.22+0.065 −0.064 |
5.95+0.13 −0.12 |
0.163±0.057 | 74+11 −15 or 106+15 −11 ° |
— |
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Horologium |
Right ascension | 04h 19m 45.46920s [1] |
Declination | –41° 57′ 36.9527″ [1] |
Apparent magnitude (V) | 8.243±0.012 [2] |
Characteristics | |
Spectral type | G3IV [2] |
B−V color index | 0.721±0.009 [2] |
Astrometry | |
Radial velocity (Rv) | 21.04±0.13 [1] km/s |
Proper motion (μ) |
RA: –41.139
mas/
yr
[1] Dec.: –91.908 mas/ yr [1] |
Parallax (π) | 19.9263 ± 0.0160 mas [1] |
Distance | 163.7 ± 0.1
ly (50.18 ± 0.04 pc) |
Absolute magnitude (MV) | 4.97 [3] |
Details [2] | |
Mass | 0.944±0.032 M☉ |
Radius | 0.923±0.033 R☉ |
Luminosity | 0.97 [3] L☉ |
Surface gravity (log g) | 4.455±0.038 cgs |
Temperature | 5,737±36 K |
Metallicity [Fe/H] | −0.12±0.05 dex |
Rotation | ~31 d |
Age | 4.010±2.892 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
HD 27631 is a star with an orbiting exoplanet in the southern constellation of Horologium. It is too faint to be visible to the naked eye, having an apparent visual magnitude of 8.24. [2] The distance to this system is 164 light years based on parallax measurements. It is drifting further away with a radial velocity of 21 km/s. [1]
This is a G-type star with a stellar classification of G3IV, [2] suggesting it is a subgiant star that is evolving off the main sequence after exhausting the supply of hydrogen at its core. It is smaller than the Sun, with 94% of its mass and 92% of the radius. [2] The star is radiating 97% [3] of the luminosity of the Sun from its photosphere at an effective temperature of 5,737 K. [2] The estimated age is roughly 4.4 billion years [5] and it is spinning slowly with a rotation period of around 31 days. [2]
A survey in 2015 has ruled out the existence of any stellar companions at projected distances above 40 astronomical units. [6]
From 1998 to 2012, the star was under observation from the CORALIE echelle spectrograph at La Silla Observatory. In 2012, a long-period, wide-orbiting exoplanet was deduced by radial velocity. This was published in November. [5] In 2023, the inclination and true mass of HD 27631 b were determined via astrometry. [7] This is a super-jovian planet with around 1.6 times the mass of Jupiter. It is orbiting the host star at a separation of 3.22 AU with an eccentricity (ovalness) of 0.16 and an orbital period of six years.
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( years) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 1.56+0.2 −0.15 MJ |
3.22+0.065 −0.064 |
5.95+0.13 −0.12 |
0.163±0.057 | 74+11 −15 or 106+15 −11 ° |
— |