Xi Aquilae

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Star
ξ Aquilae
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Eagle
Right ascension 19 h 54 m 14.88 s
declination + 08 ° 27 ′ 41.2 ″
Apparent brightness 4.71 likes
Typing
Known exoplanets 1
B − V color index +1.05 
U − B color index +0.91 
R − I index +0.57 
Spectral class K0 III
Astrometry
Radial velocity (−42.0 ± 0.2) km / s
parallax (17.77 ± 0.29)  mas
distance (183.5 ± 3.0)  ly
(56.27 ± 0.92)  pc  
Visual absolute brightness M vis +0.96 mag
Proper movement 
Rec. Share: (101.91 ± 0.28)  mas / a
Dec. portion: (−81.20 ± 0.23)  mas / a
Physical Properties
Other names
and catalog entries
Bayer name ξ Aquilae
Flamsteed name 59 Aquilae
Bonn survey BD + 8 ° 4261
Bright Star Catalog HR 7595 [1]
Henry Draper Catalog HD 188310 [2]
Hipparcos catalog HIP 97938 [3]
SAO catalog SAO 125210 [4]
Tycho catalog TYC 1058-3400-1 [5]Template: Infobox star / maintenance / specification of the TYC catalog
annotation
  1. ↑ Calculated from apparent brightness and distance.

ξ Aquilae ( Xi Aquilae , short ξ Aql ; also: Libertas ) is a giant star of the spectral class G9 in the constellation Eagle, about 200  light years away . He has a companion with the systematic name ξ Aquilae b , which could be an exoplanet .

companion

ξ Aquilae b ( Xi Aquilae b , also: Fortitudo ) is an exoplanet candidate. It orbits the central star with an orbital period of 137 days with a major semi-axis of approx. 0.7  astronomical units and has a mass of about 3 Jupiter's masses. The companion was developed by Bunei Sato et al. discovered.

Sources and individual references

  1. ↑ a b c Hipparcos catalog (ESA 1997)
  2. ↑ a b c Bright Star Catalog
  3. ↑ Pulkovo radial velocities for 35493 HIP stars
  4. ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)
  5. ↑ The Exoplanet in the "Encyclopedia of Extrasolar Planets" (English)
  6. ↑ Sato et al .: Planetary Companions around Three Intermediate-Mass G and K Giants: 18 Delphini, ξ Aquilae, and HD 81688 ; in: Publications of the Astronomical Society of Japan, Vol. 60, No. 3, pp. 539ff. (2008), bibcode : 2008PASJ ... 60..539S