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HD 190647 is a yellow-hued star with an exoplanetary companion, located in the southern constellation of Sagittarius. It has an apparent visual magnitude of 7.78,[2] making this an 8th magnitude star that is much too faint to be readily visible to the naked eye. The star is located at a distance of 178 light years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −40 km/s.[1] It is also called HIP 99115.

HD 190647
Observation data
Epoch J2000      Equinox J2000
Constellation Sagittarius
Right ascension 20h 07m 19.6698s[1]
Declination −35° 32′ 19.0786″[1]
Apparent magnitude (V) 7.78[2]
Characteristics
Spectral type G5V[3]
B−V color index 0.743±0.002[2]
Variable type Constant[4]
Astrometry
Radial velocity (Rv)−40.33±0.12[1] km/s
Proper motion (μ) RA: −26.622±0.079[1] mas/yr
Dec.: −206.859±0.053[1] mas/yr
Parallax (π)18.3287 ± 0.0495 mas[1]
Distance177.9 ± 0.5 ly
(54.6 ± 0.1 pc)
Absolute magnitude (MV)4.00[2]
Details
Mass1.07±0.01[5] M☉
Radius1.56±0.03[5] R☉
Luminosity2.19±0.01[5] L☉
Surface gravity (log g)4.07±0.02[5] cgs
Temperature5,630+48
−40[5] K
Metallicity [Fe/H]0.23[6] dex
Rotational velocity (v sin i)1.576[6] km/s
Age8.7±0.4[5] Gyr
Other designations
CD–35°13924, HD 190647, HIP 99115, SAO 211821, LTT 7948, NLTT 48727, TYC 7449-1245-1, 2MASS J20071966-3532189[7]
Database references
SIMBADdata

The stellar classification of this star is G5V,[3] matching a G-type main-sequence star. However, the low gravity and high luminosity of this star may indicate it is slightly evolved. It is chrompsherically inactive with a slow rotation,[4] having a projected rotational velocity of 1.6 km/s.[6] The star's metallicity is high, with nearly 1.5 times the abundance of iron compared to the Sun.[4]

In 2007, a Jovian planet was found to be orbiting the star. It was detected using the radial velocity method with the HARPS spectrograph in Chile. The object is orbiting at a distance of 2.0 AU from the host star with a period of 2.84 years and an eccentricity (ovalness) of 0.18. As the inclination of the orbital plane is unknown, only a lower bound on the planetary mass can be made. It has a minimum mass 1.9 times the mass of Jupiter.[4]

The HD 190647 planetary system[4]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b >1.9 ± 0.06 MJ 2.07 ± 0.06 1038.1 ± 4.9 0.18 ± 0.02 — —

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 (1979). 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. Naef, M.; et al. (2007). "The HARPS search for southern extra-solar planets. IX. Exoplanets orbiting HD 100777, HD 190647, and HD 221287". Astronomy and Astrophysics. 470 (2): 721–726. arXiv:0704.0917. Bibcode:2007A&A...470..721N. doi:10.1051/0004-6361:20077361.
  5. Bonfanti, A.; Ortolani, S.; Nascimbeni, V. (2016). "Age consistency between exoplanet hosts and field stars". Astronomy & Astrophysics. 585: 14. arXiv:1511.01744. Bibcode:2016A&A...585A...5B. doi:10.1051/0004-6361/201527297. S2CID 53971692. A5.
  6. Costa Silva, A. R.; et al. (February 2020). "Chemical abundances of 1111 FGK stars from the HARPS-GTO planet search sample. III. Sulfur". Astronomy & Astrophysics. 634: 10. arXiv:1912.08659. Bibcode:2020A&A...634A.136C. doi:10.1051/0004-6361/201936523. A136.
  7. "HD 190647". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-11-11.


На других языках

[de] HD 190647

HD 190647 ist ein etwa 190 Lichtjahre von der Erde entfernter Hauptreihenstern der Spektralklasse G5 im Schützen. Er besitzt eine scheinbare Helligkeit von 7,78 mag. Im Jahre 2007 entdeckte Dominique Naef einen extrasolaren Planeten, der diesen Stern umkreist. Dieser trägt die Bezeichnung HD 190647 b.
- [en] HD 190647

[ru] HD 190647

HD 190647 — звезда в созвездии Стрельца на расстоянии около 176 световых лет от нас. Вокруг звезды обращается, как минимум, одна планета.


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