HD 111232
Star in the constellation Musca
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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.[1] The distance to this star is 94.5 light years based on parallax.[8] It is drifting away from the Sun with a radial velocity of +104 km/s,[1] having come to within 14.1 light-years some 264,700 years ago.[9] The absolute magnitude of this star is 5.25,[1] indicating it would have been visible to the naked eye at that time.
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Musca[1] |
| Right ascension | 12h 48m 51.75256s[2] |
| Declination | −68° 25′ 30.5548″[2] |
| Apparent magnitude (V) | 7.59[1] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | G8 V Fe-1.0[3] |
| B−V color index | 0.701±0.003[1] |
| Astrometry | |
| Radial velocity (Rv) | 104.53±0.13[2] km/s |
| Proper motion (μ) | RA: 27.283±0.021[2] mas/yr Dec.: 112.918±0.024[2] mas/yr |
| Parallax (π) | 34.6094±0.0239 mas[2] |
| Distance | 94.24 ± 0.07 ly (28.89 ± 0.02 pc) |
| Absolute magnitude (MV) | 5.25[1] |
| Details[4] | |
| 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[5] dex |
| Rotation | 30.7 d[6] |
| Rotational velocity (v sin i) | 0.421[5] km/s |
| Age | 11.7±1.4 Gyr |
| Other designations | |
| CPD−67°2079, HD 111232, HIP 62534, 2MASS J12485177-6825304, Gaia DR2 5855730584310531200[7] | |
| Database references | |
| SIMBAD | data |
This is an ancient, thick disk population II[10][6] star with an estimated age of twelve billion years.[4] 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.[5] 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.[4]
Planetary system
A superjovian planetary companion was detected by the CORALIE team, based on observations beginning in 2003.[6][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 |
— |