HD 178911

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Double star
HD 178911
Observation
dates equinox :  J2000.0 , epoch : J2000.0
AladinLite
Constellation lyre
Right ascension 19 h 09.1 m
declination + 34 ° 36.0 ′
Known exoplanets

1

Astrometry
Radial velocity approx. −41 km / s
parallax approx. 20 mas
distance  approx. 160 ly
(approx. 49 pc )
Proper movement :
Rec. Share: +65 mas / a
Dec. portion: +192 mas / a
orbit 
period Aab: (1296.3 ± 1.1) days
Major semi-axis Aab: approx. 0 ", 074
eccentricity Aab: approx. 0.59
Orbit inclination Aab: approx. 150 °
Epoch of the periastron Aab: JD 2450572
Individual data
Names Aa / Ab; B.
Observation data:
Apparent brightness Aa / Ab approx. 6.9 likes / approx. 8.9 likes in
common: 6.74 likes
B. approx. 8.0 mag
Typing:
Spectral class Aa / Ab G1 / K1
B. G5
Other names
and catalog entries
Bright Star Catalog HR 7272 [1]
Henry Draper Catalog HD 178911 [2]
Bonn survey BD + 34 ° 3439 BD + 34 ° 3438
SAO catalog SAO 67879 SAO 67875
Tycho catalog TYC 2648-2148-1 [3] TYC 2648-2151-1 [4]
Hipparcos catalog HIP 94076 HIP 94075
WDS catalog WDS J19091 + 3436
Further designations: Σ 2474

HD 178911 , also cataloged as HR 7272 , is a star system in the constellation Lyra, about 160 light years away .

The system consists of a spectroscopic binary, HD 178911 A , the third of a star, HD 178911 B , is accompanied. The components A and B form a visual double star with an angular distance of 16 ", 10 ± 0", 01 (several hundred astronomical units ).

The components of the spectroscopic double star A with the systematic names HD 178911 Aa and HD 178911 Ab have an orbital period of 3.55 years and their semi-major axis measures 0 ", 074.

Component B also has a spectroscopic companion with HD 178911 Bb , which may be an exoplanet .

HD 178911 B

HD 178911 B is a star of the spectral class G and has an apparent magnitude of about 8.0 mag. It is orbited by the potential exoplanet HD 178911 Bb with an orbital period of 71.5 days . The object has a minimum mass of about 6 Jupiter's masses and was discovered using the radial velocity method; its discovery was made in 2002 by Zucker et al. released.

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