Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Musca |
Right ascension | 12h 48m 51.75258s [1] |
Declination | −68° 25′ 30.5471″ [1] |
Apparent magnitude (V) | 7.59 [2] |
Characteristics | |
Spectral type | G8 V Fe-1.0 [3] |
B−V color index | 0.701±0.003 [2] |
Astrometry | |
Radial velocity (Rv) | 104.53±0.13 [4] km/s |
Proper motion (μ) |
RA: 27.283±0.021
[4]
mas/
yr Dec.: 112.918±0.024 [4] mas/ yr |
Parallax (π) | 34.6094 ± 0.0239 mas [4] |
Distance | 94.24 ± 0.07
ly (28.89 ± 0.02 pc) |
Absolute magnitude (MV) | 5.25 [2] |
Details [5] | |
Mass | 0.80±0.02 M☉ |
Radius | 0.88±0.01 R☉ |
Luminosity | 0.700±0.003 L☉ |
Surface gravity (log g) | 4.45±0.02 cgs |
Temperature | 5,648±30 K |
Metallicity [Fe/H] | −0.32 [6] dex |
Rotation | 30.7 d [7] |
Rotational velocity (v sin i) | 0.421 [6] km/s |
Age | 11.7±1.4 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
HD 111232 is a star in the southern constellation of Musca. It is too faint to be visible with the naked eye, having an apparent visual magnitude of 7.59. [2] The distance to this star is 94.5 light years based on parallax. [1] It is drifting away from the Sun with a radial velocity of +104 km/s, [2] having come to within 14.1 light-years some 264,700 years ago. [9] The absolute magnitude of this star is 5.25, [2] indicating it would have been visible to the naked eye at that time.
This is an ancient, thick disk population II [10] [7] star with an estimated age of twelve billion years. [5] It is a G-type main-sequence star with a stellar classification of G8 V Fe-1.0, [3] indicating an anomalous underabundance of iron in the stellar atmosphere. The star has 80% of the mass of the Sun and 88% of the Sun's radius. It is spinning slowly with a projected rotational velocity of 0.4 km/s. [6] X-ray emission has not been detected, suggesting a low level of coronal activity. [11] [12] The star is radiating 70% of the luminosity of the Sun from its photosphere at an effective temperature of 5,648 K. [5]
A superjovian planetary companion was detected by the CORALIE team, based on observations beginning in 2003. [7] [12] Planets around such metal-poor stars are rare (the only two known similar cases as of 2019 are HD 22781 and HD 181720). [13] An astrometric measurement of the planet's inclination and true mass was published in 2022 as part of Gaia DR3. [14] Later in 2022, these parameters were revised along with the detection of a second substellar companion, likely a brown dwarf. [15]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( years) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 7.965+1.128 −0.479 MJ |
2.148+0.088 −0.097 |
3.201+0.002 −0.001 |
0.214+0.005 −0.003 |
93.521+16.622 −18.063 ° |
— |
c | 18.063+4.209 −1.612 MJ |
17.250+2.158 −2.151 |
72.478+14.115 −12.341 |
0.558+0.027 −0.028 |
87.902+13.916 −22.591 ° |
— |