HD 13189

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Stern
HD 13189
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation triangle
Right ascension 02 h 09 m 40.17 s
declination + 32 ° 18 ′ 59.2 ″
Apparent brightness 7.57 likes
Typing
Spectral class K2
Astrometry
Radial velocity (25.4 ± 0.3) km / s
Proper movement 
Rec. Share: (2.62 ± 1.06)  mas / a
Dec. portion: (5.32 ± 0.56)  mas / a
Physical Properties
Metallicity [Fe / H] −0.58 ± 0.04
Other names
and catalog entries
Bonn survey BD + 31 ° 370
Henry Draper Catalog HD 13189 [1]
Hipparcos catalog HIP 10085 [2]
SAO catalog SAO 55309 [3]
Tycho catalog TYC 2313-437-1 [4]

HD 13189 is a giant star belonging to the spectral class K2. It has an apparent magnitude of 7.57 mag. The mass of HD  13189 is approximately two to seven solar masses.

In 2005, astronomers at the Friedrich Schiller University Jena published the discovery they made at the Thuringian State Observatory of an object orbiting this star and which could be a brown dwarf or an exoplanet .

companion

The companion of HD 13189 was detected by a research group led by Professor Artie Hatzes , director of the Thuringian State Observatory, by observing the periodic fluctuations in the radial speed of the central star. The Thuringian findings were later confirmed by the McDonald Observatory in Texas . The companion is at least 8 to 20 times more massive than the planet Jupiter , the largest planet in the solar system , and takes around 472 days to complete one orbit. The major semi-axis of the orbit is approximately 2  astronomical units .

literature

  • AP Hatzes et al .: A giant planet around the massive giant star HD 13189 . In: Astronomy and Astrophysics , Vol. 437, No. 2, 2005, pp. 743-751. bibcode : 2005A & A ... 437..743H
  • Simon C. Schuler et al .: High-Resolution Spectroscopy of the Planetary Host HD 13189: Highly Evolved and Metal-poor . In: Astrophysical Journal , Vol. 632, No. 2, 2005, pp. L131-L134. bibcode : 2005ApJ ... 632L.131S

Web links

Individual evidence

  1. ↑ a b c Hipparcos catalog (ESA 1997)
  2. ↑ Pulkovo radial velocities for 35493 HIP stars
  3. ^ Hipparcos, the New Reduction (van Leeuwen, 2007)