HD 221287

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Stern
HD 221287
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Toucan
Right ascension 23 h 31 m 20.34 s
declination -58 ° 12 ′ 35 ″
Apparent brightness 7.82 likes
Typing
Known exoplanets 1
Spectral class F7 V
Astrometry
Radial velocity (−21.5 ± 0.4) km / s
parallax (18.09 ± 0.64)  mas
distance (180 ± 6)  ly
(55.3 ± 2.0)  pc  
Visual absolute brightness M vis +4.1 mag
Proper movement 
Rec. Share: (+180.53 ± 0.46)  mas / a
Dec. portion: (−5.39 ± 0.51)  mas / a
Physical Properties
Dimensions approx. 1  M ☉
Effective temperature (6300 ± 50)  K.
Metallicity [Fe / H] +0.03 ± 0.05
Other names
and catalog entries
Cordoba Survey CD −58 ° 8579
Henry Draper Catalog HD 221287 [1]
Hipparcos catalog HIP 116084 [2]
SAO catalog SAO 247912 [3]
Tycho catalog TYC 8838-463-1 [4]Template: Infobox star / maintenance / specification of the TYC catalog
annotation
  1. ↑ Estimated from apparent brightness and distance.

HD 221287 is the name of the sun about 55  parsecs (180  light years ) distant star, which from an exoplanet is orbiting. The star in the constellation Toucan is a main sequence star of the spectral type F7 and has an apparent magnitude of 7.82. With a surface temperature of approx. 6300 K, the star is relatively similar to the sun.

The planet

Main article: HD 221287 b

Due to the large number of newly found, extrasolar planets, newly discovered companions are no longer given proper names. Therefore, the planet orbiting HD 221287 is simply called "b", ie HD 221287 b. HD 221287 b has at least 3.09 (± 0.79) masses of Jupiter and takes 456 days to orbit its star. Since direct observation of the planet is impossible with today's technical means due to the great distance and the great difference in brightness from its star, most sizes are minimum or maximum sizes. The average distance of the planet from its star is 1.25  AU .

literature

  • Dominique Naef, Michel Mayor, Willy Benz, Francois Bouchy, Gaspare Lo Curto, Christophe Lovis, Claire Moutou, Francesco Pepe, Didier Queloz, Nuno C. Santos, Stephane Udry: The HARPS search for southern extra-solar planets IX. Exoplanets orbiting HD 100777, HD 190647, and HD 221287 . In: Astronomy & Astrophysics . tape 470 , no. 2 , 2007, ISSN  0004-6361 , p. 721-726 , doi : 10.1051 / 0004-6361: 20077361 , arxiv : 0704.0917 .

Web links

Individual evidence

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