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HD 108236
Observation data; Epoch J2000 Equinox J2000
Constellation	Centaurus
Right ascension	12h 26m 17.8916s
Declination	−51° 21′ 46.2141″
Apparent magnitude (V)	9.24
Characteristics
Evolutionary stage	main-sequence star
Spectral type	G5V
Astrometry
Radial velocity (Rv)	16.78±0.22 km/s
Proper motion (μ)	RA: −70.627 mas/yr ; Dec.: −49.758 mas/yr
Parallax (π)	15.4861 ± 0.0127 mas
Distance	210.6 ± 0.2 ly ; (64.57 ± 0.05 pc)
Details
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
Database references
SIMBAD	data

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.^[3]

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.^[4] The reason for the false positive was contamination from a nearby infrared source.^[5]

Planetary system

In 2020, four planets orbiting HD 108236 were discovered^[6] by the transit method, followed by another one in 2021.^[7]

The HD 108236 planetary system^[3]^[7]
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 $R$ _🜨

References

^ ^a ^b ^c "HD 108236". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-17.
^ ^a ^b ^c ^d Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
^ ^a ^b ^c Hoyer, S.; et al. (2022), "Characterization of the HD 108236 system with CHEOPS and TESS Confirmation of a fifth transiting planet", Astronomy & Astrophysics, 668: A117, arXiv:2210.08912, Bibcode:2022A&A...668A.117H, doi:10.1051/0004-6361/202243720, S2CID 252832042
^ Patel, Rahul I.; Metchev, Stanimir A.; Heinze, Aren (2014), "A Sensitive Identification of Warm Debris Disks in the Solar Neighborhood Through Precise Calibration of Saturated Wise Photometry", The Astrophysical Journal Supplement Series, 212 (1): 10, arXiv:1403.3435, Bibcode:2014ApJS..212...10P, doi:10.1088/0067-0049/212/1/10, S2CID 119219094
^ Patel, Rahul I.; Metchev, Stanimir A.; Heinze, Aren; Trollo, Joseph (2016), "The Faintest WISE debris Disks: Enhanced Methods for Detection and Verification", The Astronomical Journal, 153 (2): 54, arXiv:1612.04818, Bibcode:2017AJ....153...54P, doi:10.3847/1538-3881/153/2/54, S2CID 3006490
^ Daylan, Tansu; Pingle, Kartik; Wright, Jasmine; Guenther, Maximilian N.; Stassun, Keivan G.; Kane, Stephen R.; Vanderburg, Andrew; Jontof-Hutter, Daniel; Rodriguez, Joseph E.; Shporer, Avi; Huang, Chelsea; Mikal-Evans, Tom; Badenas-Agusti, Mariona; Collins, Karen A.; Rackham, Benjamin; Quinn, Sam; Cloutier, Ryan; Collins, Kevin I.; Guerra, Pere; Jensen, Eric L. N.; Kielkopf, John F.; Massey, Bob; Schwarz, Richard P.; Charbonneau, David; Lissauer, Jack J.; Irwin, Jonathan M.; Basturk, Ozgur; Fulton, Benjamin; Soubkiou, Abderahmane; et al. (2021). "TESS Discovery of a Super-Earth and Three Sub-Neptunes Hosted by the Bright, Sun-like Star HD 108236". The Astronomical Journal. 161 (2): 85. arXiv:2004.11314. Bibcode:2021AJ....161...85D. doi:10.3847/1538-3881/abd73e. S2CID 216080635.
^ ^a ^b Bonfanti, A.; Delrez, L.; Hooton, M. J.; Wilson, T. G.; Fossati, L.; Alibert, Y.; Hoyer, S.; Mustill, A. J.; Osborn, H. P.; Adibekyan, V.; Gandolfi, D.; Salmon, S.; Sousa, S. G.; Tuson, A.; Van Grootel, V.; Cabrera, J.; Nascimbeni, V.; Maxted, P. F. L.; Barros, S. C. C.; Billot, N.; Bonfils, X.; Borsato, L.; Broeg, C.; Davies, M. B.; Deleuil, M.; Demangeon, O. D. S.; Fridlund, M.; Lacedelli, G.; Lendl, M.; et al. (2021). "CHEOPS observations of the HD 108236 planetary system: A fifth planet, improved ephemerides, and planetary radii". Astronomy & Astrophysics. 646: A157. arXiv:2101.00663. Bibcode:2021A&A...646A.157B. doi:10.1051/0004-6361/202039608. S2CID 230437723.