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HD 86226 is a G-type yellowish white star found in the constellation of Hydra.

HD 86226
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Hydra
Right ascension 09h 56m 29.84418s[1]
Declination –24° 05′ 57.7958″[1]
Apparent magnitude (V) 7.93[2]
Characteristics
Spectral type G2V[3]
Apparent magnitude (B) 8.577[1]
Apparent magnitude (R) 7.71[1]
Apparent magnitude (J) 6.839±0.019[1]
Apparent magnitude (H) 6.577±0.034[1]
Apparent magnitude (K) 6.463±0.023[1]
B−V color index 0.647±0.014[1]
V−R color index 0.22[1]
Astrometry
Radial velocity (Rv)+19.56±0.19[1] km/s
Proper motion (μ) RA: –177.111[1] mas/yr
Dec.: +46.867[1] mas/yr
Parallax (π)21.8612 ± 0.0499 mas[1]
Distance149.2 ± 0.3 ly
(45.7 ± 0.1 pc)
Absolute magnitude (MV)4.66[1]
Details[4]
Mass1.019+0.061
−0.066 M☉
Radius1.053+0.026
−0.026 R☉
Luminosity1.180+0.036
−0.029 L☉
Surface gravity (log g)4.400+0.029
−0.032 cgs
Temperature5863±88 K
Metallicity [Fe/H]0.018+0.057
−0.043 dex
Age4.6+3.7
−2.7 Gyr
Other designations
CD–23°8866, HD 86226, HIP 48739, SAO 178205, PPM 256971[5]
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

A survey in 2015 has ruled out the existence of any stellar companions at projected distances above 12 astronomical units.[6]

Radio emission at a frequency of 150 MHz has been tentatively detected from the proximity of this system, although it is not clear whether the star or a satellite orbiting a rapidly rotating planet is the source.[7]


Planetary system


Due to the periodic spectrum shifts when it had when placed under a Doppler test, 13 Magellan Doppler Velocity observations were made of an object found near the star. The object discovered in 2010 had a Keplerian orbit, was declared an exoplanet and dubbed HD 86226 b.[8]

A hot Super-Earth planet called HD 86226 c was also discovered in 2020.[4] It may be undergoing considerable atmospheric mass loss.[9]

The HD 86226 planetary system[4][10]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
c 7.25+1.19
−1.12 M🜨		 0.049±0.001 3.98442±0.00018 0.075+0.065
−0.048		 86.45+0.26
−0.16°		 2.16±0.08 R🜨
b 0.45+0.04
−0.05 MJ		 2.73±0.06 1628+22
−21		 0.059+0.062
−0.039		 — —

See also



References


  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  3. Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H
  4. Teske, Johanna; et al. (2020), "TESS Reveals a Short-period Sub-Neptune Sibling (HD 86226c) to a Known Long-period Giant Planet", The Astronomical Journal, 160 (2): 96, arXiv:2007.13927, Bibcode:2020AJ....160...96T, doi:10.3847/1538-3881/ab9f95, S2CID 220830943
  5. "HD 86226". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-02-10.
  6. Mugrauer, M.; Ginski, C. (12 May 2015). "High-contrast imaging search for stellar and substellar companions of exoplanet host stars". Monthly Notices of the Royal Astronomical Society. 450 (3): 3127–3136. doi:10.1093/mnras/stv771. Retrieved 19 June 2020.
  7. Sirothia, S. K.; et al. (February 2014). "Search for 150 MHz radio emission from extrasolar planets in the TIFR GMRT Sky Survey". Astronomy & Astrophysics. 562: 9. Bibcode:2014A&A...562A.108S. doi:10.1051/0004-6361/201321571. A108.
  8. Arriagada, Pamela; et al. (2010). "Five Long-period Extrasolar Planets in Eccentric orbits from the Magellan Planet Search Program". The Astrophysical Journal. 711 (2): 1229–1235. arXiv:1001.4093. Bibcode:2010ApJ...711.1229A. doi:10.1088/0004-637X/711/2/1229. S2CID 118682009.
  9. Gupta, Akash; Schlichting, Hilke E. (July 2021). "Caught in the act: core-powered mass-loss predictions for observing atmospheric escape". Monthly Notices of the Royal Astronomical Society. 504 (3): 4634–4648. arXiv:2103.08785. Bibcode:2021MNRAS.504.4634G. doi:10.1093/mnras/stab1128.
  10. Marmier, M.; et al. (March 2013). "The CORALIE survey for southern extrasolar planets XVII. New and updated long period and massive planets". Astronomy and Astrophysics. 551: A90. arXiv:1211.6444. Bibcode:2013A&A...551A..90M. doi:10.1051/0004-6361/201219639. S2CID 59467665.



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- [en] HD 86226

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HD 86226 — звезда, которая находится в созвездии Гидры на расстоянии около 139 световых лет от нас. Вокруг звезды обращается, как минимум, одна планета.


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