HD 43197

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HD 43197
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Canis Major
Right ascension 06h 13m 35.66162s[1]
Declination –29° 53′ 50.1518″[1]
Apparent magnitude (V) 8.98[2]
Characteristics
Spectral type G8/K0 IV/V[3]
Apparent magnitude (B) 9.797[2]
Apparent magnitude (J) 7.658±0.024[2]
Apparent magnitude (H) 7.328±0.038[2]
Apparent magnitude (K) 7.203±0.026[2]
B−V color index 0.817±0.022[2]
Astrometry
Radial velocity (Rv)+72.79±0.14[1] km/s
Proper motion (μ) RA: 147.585[1] mas/yr
Dec.: 16.605[1] mas/yr
Parallax (π)15.9938 ± 0.0233[1] mas
Distance203.9 ± 0.3 ly
(62.52 ± 0.09 pc)
Absolute magnitude (MV)5.24[2]
Details
Mass1.02±0.02[4] M☉
Radius0.96±0.02[4] R☉
Luminosity0.74±0.01[4] L☉
Surface gravity (log g)4.47±0.03[4] cgs
Temperature5,469±35[4] K
Metallicity [Fe/H]0.4 dex
Age3.1±2.0[4] Gyr
Other designations
Amadioha, CD–29°2884, HD 43197, HIP 29550, SAO 171427, PPM 250048[5]
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

HD 43197 is a star with an exoplanetary companion in the southern constellation of Canis Major. It has been given the proper name Amadioha, as selected by Nigeria during the NameExoWorlds campaign that celebrated the 100th anniversary of the IAU. Amadioha is the god of thunder in Igbo mythology.[6][7] It has an apparent visual magnitude of 8.98,[2] meaning this is a ninth magnitude star that is too dim to be visible to the naked eye. The system is located at a distance of 204 light-years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of +73 km/s.[1] It made its closest approach some 583,000 years ago when it came to within 87 light-years.[2]

The stellar classification of this star is G8/K0 IV/V,[3] which may be interpreted to mean the spectrum is intermediate between similar stars of class G8 and K0, and its luminosity class showing a blend of a main sequence star (V) and a subgiant star (IV). It is a weakly active star with a high metallicity, being five halves as much as the Sun.[8] The star is about the same mass and size as the Sun, although the luminosity is only 74% of solar.[4] The star's age is estimated to be at least three billion years.[8]

In 2009, the HARPS planet search program announced a Jovian planet in a highly eccentric orbit around the star.[8] The planet spends ∼78% of its orbital period in the habitable zone of the host star, although temperatures can reach 716 K during periastron passage.[9]

The HD 43197 planetary system[8]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b ≥ 0.60+0.12
−0.04 MJ 		0.92+0.01
−0.02 		327.8±1.2 0.83+0.05
−0.01 		— —

See also[]

  • List of extrasolar planets

References[]

  1. ^ a b c d e f g 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. ^ a b c d e f g h i 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. ^ a b Houk, Nancy (1982). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 3. Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan. Bibcode:1982mcts.book.....H.
  4. ^ a b c d e f g Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951. S2CID 54555839.
  5. ^ "HD 43197". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-10-20.
  6. ^ "Approved names". NameExoworlds. IAU. Retrieved 2020-01-02.
  7. ^ "International Astronomical Union | IAU". www.iau.org. IAU. Retrieved 2020-01-02.
  8. ^ a b c d Naef, Dominique; et al. (2010). "The HARPS Search for Southern Extrasolar Planets XXIII. 8 Planetary Companions to Low-activity Solar-type Stars". Astronomy and Astrophysics. 523: A15. arXiv:1008.4600. Bibcode:2010A&A...523A..15N. doi:10.1051/0004-6361/200913616. S2CID 118845989.
  9. ^ Kane, Stephen R.; Gelino, Dawn M. (November 2011). "Detectability of Exoplanet Periastron Passage in the Infrared". The Astrophysical Journal. 741 (1): 9. arXiv:1108.1803. Bibcode:2011ApJ...741...52K. doi:10.1088/0004-637X/741/1/52. 52.

Coordinates: Sky map 06h 13m 35.6615s, −29° 53′ 50.169″

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