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HD 181433 is a star located approximately 87 light-years away[3][note 1] in the constellation of Pavo (the Peacock). According to SIMBAD, it has a stellar classification of K3III-IV,[1] which puts it on the borderline between being a red giant and a subgiant. This is inconsistent with the fact that its luminosity is only 0.308 times that of the Sun.[6] Its entry in the Hipparcos catalogue lists a spectral type of K5V,[2] classifying it as a dwarf star. As of 2008, three extrasolar planets are thought to be orbiting the star.[7] There is currently little information on these planets. The name of this star comes from its identifier in the Henry Draper catalogue.

HD 181433
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pavo
Right ascension 19h 25m 09.5663s[1]
Declination −66° 28′ 07.671″[1]
Apparent magnitude (V) 8.38[1]
Characteristics
Spectral type K5V[2]
B−V color index 1.04[1]
Astrometry
Radial velocity (Rv)+37.9[1] km/s
Proper motion (μ) RA: –230.60[3] mas/yr
Dec.: 235.37[3] mas/yr
Parallax (π)37.37 ± 1.13 mas[3]
Distance87 ± 3 ly
(26.8 ± 0.8 pc)
Absolute magnitude (MV)6.26[4]
Details
Mass0.86 ± 0.06[5] M☉
Surface gravity (log g)4.57 ± 0.04[5] cgs
Temperature4902 ± 41[5] K
Metallicity [Fe/H]0.65[5] dex
Age6.7 ± 1.8[5] Gyr
Other designations
CD−66° 2307, GJ 756.1, HIP 95467, SAO 254563
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

Planetary system


Orbiting the star are three planets, whose discovery was announced in 2008;[8] the discovery paper was published in 2009.[6] The inner planet has a mass at least 7.5 times that of Earth, and is termed a super-Earth (this classification is based solely on the mass of the planet and should not be taken to imply that the planet could support Earthlike conditions). The middle planet and the outer planet are gas giants. The orbital periods for three planets are 9.3743 days for a 7.56 ME planet, 962 days for a 0.64 MJ planet, and 2172 days for a 0.54 MJ planet.[6] This solution is unstable, more data are required to constrain the orbital position of planet d.[9]

Diagram of the (probable) HD 181433 Star System.
Diagram of the (probable) HD 181433 Star System.
The HD 181433 planetary system[6]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥0.0238 MJ 0.080 9.3743 ± 0.0019 0.396 ± 0.062 — —
c ≥0.64 MJ 1.76 962 ± 15 0.28 ± 0.02 — —
d ≥0.54 MJ 3.00 2172 ± 158 0.48 ± 0.05 — —

See also



Notes


  1. Calculated from parallax:

References


  1. "NLTT 47732 -- High proper-motion star". SIMBAD. Retrieved 2008-10-02.
  2. ESA (1997). "HIP 95152". The Hipparcos and Tycho Catalogues: The Hipparcos Main Catalogue. Retrieved 2008-10-02.
  3. van Leeuwen, F. (2007). "HIP 95152". Hipparcos, the New Reduction: The Astrometric Catalogue. Retrieved 2008-10-02.
  4. 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.
  5. Trevisan, M.; et al. (November 2011), "Analysis of old very metal rich stars in the solar neighbourhood", Astronomy & Astrophysics, 535: A42, arXiv:1109.6304, Bibcode:2011A&A...535A..42T, doi:10.1051/0004-6361/201016056, S2CID 49565866. See table 13.
  6. Bouchy, François; Mayor, Michel; Lovis, Christophe; Udry, Stéphane; Benz, Willy; Bertaux, Jean-Loup; Delfosse, Xavier; Mordasini, Christoph; Pepe, Francesco; Queloz, Didier; Ségransan, Damien (2009). "The HARPS Search for Southern Extra-solar Planets. XVII. Super-Earth and Neptune-mass Planets in Multiple Planet Systems HD 47186 and HD 181433". Astronomy and Astrophysics. 496 (2): 527–31. arXiv:0812.1608. Bibcode:2009A&A...496..527B. doi:10.1051/0004-6361:200810669. S2CID 117778593.
  7. "A Trio of Super-Earths" (Press release). ESO. 2008-06-16. Archived from the original on 2008-10-07. Retrieved 2008-10-02.
  8. "Astronomers find batch of "Super Earths"". BT Yahoo.com. Archived from the original on 2008-06-17. Retrieved 2008-06-16.
  9. Campanella, G. (2011). "Treating dynamical stability as an observable: a 5:2 MMR configuration for the extrasolar system HD 181433". MNRAS. 418 (2): 1028–1038. arXiv:1108.0360. Bibcode:2011MNRAS.418.1028C. doi:10.1111/j.1365-2966.2011.19553.x.



На других языках

- [en] HD 181433

[es] HD 181433

HD 181433 es una estrella de magnitud aparente +8,38 en la constelación de Pavo. Desde 2008 se conoce la existencia de tres planetas extrasolares orbitando en torno a esta estrella.

[ru] HD 181433

HD 181433 — звезда в созвездии Павлина. Находится на расстоянии около 87 световых лет от Солнца. Вокруг звезды обращаются три (неподтверждённые) планеты. Имеет видимую звёздную величину +8,38m.


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