HD 108236
G-type main sequence star in the constellation Centaurus
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HD 108236 is a G-type main-sequence star. Its surface temperature is 5660±61 K. HD 108236 is severely depleted in heavy elements compared to the Sun, with a metallicity Fe/H index of −0.28±0.04 (52% of the Solar System), and is probably older than the Sun at an age of 6.7+3.3
−3.4 billion years.[5]
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Centaurus[1] |
| Right ascension | 12h 26m 17.8919s[2] |
| Declination | −51° 21′ 46.216″[2] |
| Apparent magnitude (V) | 9.24[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | G5V[4] |
| Astrometry | |
| Radial velocity (Rv) | 16.91±0.15[2] km/s |
| Proper motion (μ) | RA: −70.627[2] mas/yr Dec.: −49.758[2] mas/yr |
| Parallax (π) | 15.4861±0.0127 mas[2] |
| Distance | 210.6 ± 0.2 ly (64.57 ± 0.05 pc) |
| Absolute magnitude (MV) | +5.17[1] |
| Details[5] | |
| Mass | 0.867+0.047 −0.046 M☉ |
| Radius | 0.876±0.007 R☉ |
| Luminosity | 0.707±0.032 L☉ |
| Surface gravity (log g) | 4.49±0.11 cgs |
| Temperature | 5660±61 K |
| Metallicity [Fe/H] | −0.28±0.04 dex |
| Age | 6.7+3.3 −3.4 Gyr |
| Other designations | |
| CD−50 6971, HIP 60689, TOI-1233, TYC 8243-1948-1, GSC 08243-01948, 2MASS J12261789-5121462[6] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
According to WISE mission data, the star was suspected to be surrounded by a debris disk, but a reanalysis of the data rejected the debris disk hypothesis by 2014.[7] The reason for the false positive was contamination from a nearby infrared source.[8]
Planetary system
In 2020, four planets orbiting HD 108236 were discovered[9] by the transit method, followed by another one in 2021.[10]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| b | 4.23+0.41 −0.39 M🜨 |
0.0451±0.0004 | 3.7958785+0.0000076 −0.0000070 |
0.067+0.025 −0.026 |
88.23±0.32 | 1.587±0.028 R🜨 |
| c | 8.90+0.67 −0.64 M🜨 |
0.0626±0.0006 | 6.2036717+0.0000092 −0.0000100 |
0.091+0.021 −0.033 |
88.8±0.2 | 2.122±0.025 R🜨 |
| d | 7.75+0.91 −0.62 M🜨 |
0.1087±0.0010 | 14.175818+0.000024 −0.000023 |
0.075+0.021 −0.022 |
88.8±0.1 | 2.629±0.031 R🜨 |
| e | 8.2+3.8 −1.2 M🜨 |
0.1348±0.0012 | 19.5901277±0.000030 | 0.073+0.014 −0.017 |
89.3±0.1 | 3.008±0.032 R🜨 |
| f | 3.95+0.46 −0.32 M🜨 |
0.1773±0.0016 | 29.53935+0.00012 −0.00014 |
0.024+0.024 −0.016 |
89.07±0.03 | 1.89±0.04 R🜨 |
See also
- List of exoplanets discovered in 2020 - HD 108236 b through e
- List of exoplanets discovered in 2021 - HD 108236 f