HD 178911 Bb

HD 178911 Bb

Extrasolar planet		List of extrasolar planets
Parent star
Star		HD 178911 B
Constellation		Lyra
Right ascension	(α)	19h 09m 04.3838s
Declination	(δ)	+34° 36′ 01.625″
Distance		160 ly (49.0 pc)
Spectral type		G1V
Orbital elements
Semimajor axis	(a)	0.345 AU
Periastron	(q)	0.297 AU
Apastron	(Q)	0.393 AU
Eccentricity	(e)	0.139 ± 0.14
Orbital period	(P)	71.511 ± 0.011 d (0.19578 y)
Orbital speed	(υ)	52.7 km/s
Argument of periastron	(ω)	172.3 ± 5°
Time of periastron	(T0)	2,451,378.23 ± 83 JD
Semi-amplitude	(K)	346.9 ± 4.2 m/s
Physical characteristics
Minimum mass	(m sin i)	7.35 MJ (2340 M⊕)
Discovery information
Discovery date		April 4, 2001
Discoverer(s)		Zucker et al.
Detection method		Radial velocity (Echelle)
Discovery status		Published
Other designations
HIP 94076 b
Database references
Extrasolar Planets Encyclopaedia		data
SIMBAD		data

HD 178911 Bb is a planet discovered in 2001 by Zucker who used the radial velocity method. The minimum mass of this giant planet is 7.35 times that of Jupiter that orbits close to the star. The period of the planet is 71.5 days and the semi-amplitude is 346.9 m/s.

References

• Zucker et al.; Naef, D.; Latham, D. W.; Mayor, M.; Mazeh, T.; Beuzit, J. L.; Drukier, G.; Perrier‐bellet, C. et al (2002). "A Planet Candidate in the Stellar Triple System HD 178911". ApJ 568 (1): 363–368. arXiv:astro-ph/0111550. Bibcode 2002ApJ...568..363Z. doi:10.1086/338892. 

External links

• "HD 178911". Exoplanets. http://media4.obspm.fr/exoplanets/base/etoile.php?nom=HD+178911+B. 
• "HD 178911 B b". Extrasolar Visions. http://www.extrasolar.net/planettour.asp?StarCatId=normal&PlanetId=167.