HD 13189

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HD 13189
HD 13189 1AU Celestia.jpg
HD 13189 as seen in Celestia.
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Triangulum
Right ascension 02h 09m 40.17260s[1]
Declination +32° 18′ 59.1649″[1]
Apparent magnitude (V) +7.57[2]
Spectral type K1II-III[3]
Radial velocity (Rv)25.39[4] km/s
Proper motion (μ) RA: 2.62[1] mas/yr
Dec.: 5.32[1] mas/yr
Parallax (π)1.78 ± 0.73[1] mas
Distanceapprox. 1,800 ly
(approx. 600 pc)
Absolute magnitude (MV)–3.8[5]
Mass2–7[2] M
Radius45.5[6] to 50.4[7] R
Diameter45.5[6] to 50.4[7] D
Luminosity3,980[5] L
Surface gravity (log g)1.74[7] cgs
Temperature4,365[6] K
Metallicity [Fe/H]-0.58 ± 0.04[8] dex
Other designations
BD+31° 370, HIP 10085, SAO 55309.[9]
Database references

HD 13189 is a star located in the Triangulum constellation. It has an apparent magnitude of 8.

In 2005, a planetary companion or maybe even brown dwarf was announced to orbit this star; at the time, the parallax estimate was 0.54 ± 0.93 mas, which would suggest a distance of 6,040 ly (1,850 pc) with a significantly large margin of error.[2] In 2007, van Leeuwen published a revised parallax measurement of 1.78 ± 0.73, which corresponds to a distance of 1,830 ly (560 pc) with a smaller but still significant margin of error.[1]

It has a spectral classification of K1II-III, making it a giant star that has evolved away from the main sequence. The mass of this star is 2–7 times the Sun's mass, [2] while measurements of the star's radius give estimates from 45.5[6] to 50.4[7] solar radii. This mass range, however, is typical of a B-type main sequence star,[10] suggesting the star was a type B when it spent its time on the main sequence. The atmosphere of the star displays short period radial velocity variations with a primary period of 4.89 days. This behavior is typical for giant K-type stars such as this and it is not the result of a close-orbit planetary companion.[5]

The star is possibly the most massive of all planet-harboring stars[11] although the star NGC 4349-127, a red giant located in the Crux (Southern Cross) constellation, is possibly even more massive.[12]

HD 13189 b[edit]

HD 13189 b is an exoplanet or brown dwarf with a mass that ranges from 8 to 20 Jupiter masses. This object is located at a mean distance of 1.85 astronomical units from the star, taking it 472 days to make one elliptical orbit.

This object was discovered by astronomers living in Tautenburg, Icons-flag-de.png Germany in 2005.[13]


  1. 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode 2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. 2.0 2.1 2.2 2.3 Hatzes, A. P. et al. (2005). "A giant planet around the massive giant star HD 13189". Astronomy and Astrophysics 437 (2): 743–751. Bibcode 2005A&A...437..743H. doi:10.1051/0004-6361:20052850.
  3. Lee, B.-C. et al. (May 2011). "A likely exoplanet orbiting the oscillating K-giant α Arietis". Astronomy & Astrophysics 529. arXiv:1104.4431. Bibcode 2011A&A...529A.134L. doi:10.1051/0004-6361/201016293.
  4. Famaey, B. et al. (January 2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics 430 (1): 165–186. arXiv:astro-ph/0409579. Bibcode 2005A&A...430..165F. doi:10.1051/0004-6361:20041272.
  5. 5.0 5.1 5.2 Hatzes, Artie P.; Zechmeister, Mathias (October 2008). "Stellar oscillations in planet-hosting giant stars". Journal of Physics: Conference Series 118 (1): 012016. Bibcode 2008JPhCS.118a2016H. doi:10.1088/1742-6596/118/1/012016.
  6. 6.0 6.1 6.2 van Belle, Gerard T.; von Braun, Kaspar (April 2009). "Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars". The Astrophysical Journal 694 (2): 1085–1098. arXiv:0901.1206. Bibcode 2009ApJ...694.1085V. doi:10.1088/0004-637X/694/2/1085. See Table 3 of the online data.
  7. 7.0 7.1 7.2 Baines, Ellyn K. et al. (June 2008). "CHARA Array Measurements of the Angular Diameters of Exoplanet Host Stars". The Astrophysical Journal 680 (1): 728–733. arXiv:0803.1411. Bibcode 2008ApJ...680..728B. doi:10.1086/588009.
  8. Kim, J. H. et al. (December 2005). "High-Resolution Spectroscopy of the Planetary Host HD 13189: Highly-Evolved and Metal-Poor". Bulletin of the American Astronomical Society 37: 1269. Bibcode 2006PhuZ...37....4.. doi:10.1002/piuz.200690006. Archived from the original on 2007-03-29. https://web.archive.org/web/20070329174944/http://www.aas.org/publications/baas/v37n4/aas207/1226.htm.
  9. "HD 13189 -- Star". SIMBAD (Centre de Données astronomiques de Strasbourg). http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+13189. Retrieved 2011-12-13.
  10. Habets, G. M. H. J.; Heinze, J. R. W. (November 1981). "Empirical bolometric corrections for the main-sequence". Astronomy and Astrophysics Supplement Series 46: 193–237. Bibcode 1981A&AS...46..193H. See Tables VII, VIII.
  11. Lua error in Module:Citation/CS1 at line 379: attempt to call method 'match' (a nil value).
  12. Lua error in Module:Citation/CS1 at line 379: attempt to call method 'match' (a nil value).
  13. A Giant Planet Around The Massive Giant Star HD 13189 Archived 2015-07-20 at the Wayback Machine.

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