HD 13189

HD 13189 is an 8th magnitude star in Triangulum constellation.

HD 13189

HD 13189 as seen in Celestia.
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Triangulum
Right ascension 02h 09m 40.1723s[1]
Declination +32° 18′ 59.161″[1]
Apparent magnitude (V) +7.57[2]
Characteristics
Spectral type K1II-III[3]
Astrometry
Radial velocity (Rv)25.39[4] km/s
Proper motion (μ) RA: 2.306±0.024[1] mas/yr
Dec.: 4.935±0.022[1] mas/yr
Parallax (π)2.0450 ± 0.0240 mas[1]
Distance1,590 ± 20 ly
(489 ± 6 pc)
Absolute magnitude (MV)−0.3[5]
Details
Mass1.2[6] M☉
Radius38[7] R☉
Luminosity503[1] L☉
Surface gravity (log g)1.21[6] cgs
Temperature4,035[6] K
Metallicity [Fe/H]−0.18[6] dex
Age4.4[8] Gyr
Other designations
BD+31°370, HIP 10085, SAO 55309[9]
Database references
SIMBADdata

In 2005, a planetary companion or brown dwarf was announced in orbit around 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 high margin of error.[2] In 2007, van Leeuwen published a revised parallax measurement of 1.78±0.73 mas, which corresponds to a distance of 1,830 ly (560 pc) with a smaller but still significant margin of error.[10] In 2022 the Gaia spacecraft measured a parallax of 2.0450±0.0240 mas which is a distance of 1,590 ly (489 pc) with an error of only 20 ly (6 pc).

It has a spectral classification of K1II-III, making it a giant star that has evolved away from the main sequence. The mass is 1.2 times the Sun's, while measurements of the star's radius give estimates of 38 R☉. 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.[11]

HD 13189 b
HD 13189 b
Discovery
Discovered byHatzes et al.
Discovery siteTautenburg, Germany
Discovery date2005
Radial Velocity
Orbital characteristics
1.85 ± 0.35 AU (277,000,000 ± 52,000,000 km)
Eccentricity0.28 ± 0.06
471.6 ± 6 d
2452327.9 ± 20.2
160.7 ± 12
Semi-amplitude6.8 ± 1.5
Physical characteristics
Mass>14 ± 6 MJ

    HD 13189 b is an exoplanet or brown dwarf with mass ranges from 8 to 20 Jupiter mass. This object is located at a mean distance of 277 Gm (1.85 AU) from the star, taking 472 days to make one elliptical orbit.

    This object was discovered in Tautenburg, Germany in 2005.[12]

    References
    1. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
    2. 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: A134. arXiv:1104.4431. Bibcode:2011A&A...529A.134L. doi:10.1051/0004-6361/201016293. S2CID 58906630.
    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. S2CID 17804304.
    5. Gontcharov, G. A. (2011). "The red giant branch in the Tycho-2 catalogue". Astronomy Letters. 37 (10): 707–717. arXiv:1607.00557. Bibcode:2011AstL...37..707G. doi:10.1134/S1063773711090040. S2CID 119272127.
    6. Anders, F.; Khalatyan, A.; Queiroz, A. B. A.; Chiappini, C.; Ardevol, J.; Casamiquela, L.; Figueras, F.; Jimenez-Arranz, O.; Jordi, C.; Monguio, M.; Romero-Gomez, M.; Altamirano, D.; Antoja, T.; Assaad, R.; Cantat-Gaudin, T.; Castro-Ginard, A.; Enke, H.; Girardi, L.; Guiglion, G.; Khan, S.; Luri, X.; Miglio, A.; Minchev, I.; Ramos, P.; Santiago, B. X.; Steinmetz, M. (2022). "VizieR Online Data Catalog: StarHorse2, Gaia EDR3 photo-astrometric distances (Anders+, 2022)". Vizier Online Data Catalog. Bibcode:2022yCat.1354....0A.
    7. Stassun, Keivan G.; Collins, Karen A.; Gaudi, B. Scott (2017). "Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes". The Astronomical Journal. 153 (3): 136. arXiv:1609.04389. Bibcode:2017AJ....153..136S. doi:10.3847/1538-3881/aa5df3. S2CID 119219062.
    8. Maldonado, J.; Villaver, E. (2016). "Evolved stars and the origin of abundance trends in planet hosts". Astronomy and Astrophysics. 588: A98. arXiv:1602.00835. Bibcode:2016A&A...588A..98M. doi:10.1051/0004-6361/201527883. S2CID 119212009.
    9. "HD 13189 -- Star". SIMBAD. Retrieved 2011-12-13.
    10. 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. S2CID 18759600.
    11. 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.
    12. A Giant Planet Around The Massive Giant Star HD 13189 Archived 2015-07-20 at the Wayback Machine
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