Rho Coronae Borealis b

Rho Coronae Borealis b

Extrasolar planet		List of extrasolar planets
Parent star
Star		Rho Coronae Borealis
Constellation		Corona Borealis
Right ascension	(α)	16h 01m 02.6616s
Declination	(δ)	+33° 18′ 12.634″
Apparent magnitude	(mV)	5.4
Distance		56.8±0.7 ly (17.4±0.2 pc)
Spectral type		G0-2Va
Orbital elements
Semimajor axis	(a)	0.229±0.013 AU
Eccentricity	(e)	0.057±0.028
Orbital period	(P)	39.8449±0.0063 d
Argument of periastron	(ω)	303°
Time of periastron	(T0)	2,450,563.2±4.1 JD
Semi-amplitude	(K)	64.9±2.4 m/s
Physical characteristics
Minimum mass	(m sin i)	1.093±0.098 MJ
Temperature	(T)	~627 K
Discovery information
Discovery date		24 April 1997
Discoverer(s)		Noyes et al.
Detection method		Radial velocity
Discovery site		United States
Discovery status		Confirmed
Database references
Extrasolar Planets Encyclopaedia		data
SIMBAD		data

Rho Coronae Borealis b (ρ CrB b / ρ Coronae Borealis b) is an extrasolar planet approximately 57 light-years away in the constellation of Corona Borealis. The planet was discovered orbiting the Solar twin, yellow dwarf star Rho Coronae Borealis in April 1997 (one of the first discovered). The planet's distance to the star is only about one fifth Earth's distance from the Sun. The orbit is circular and it takes 40 days to complete one revolution around the star. The planet has a mass about that of Jupiter. However, the inclination of the orbital plane is not known, so the value is only a minimum.

In 2000 group of scientist claimed, based on preliminary Hipparcos astrometrical satellite data, that the inclination of the planet would be 0.5° and mass as much as 115 times Jupiter. Such a massive body would be nothing else but a dim red dwarf. However, this is statistically very improbable, and the claim has not been backed up.

See also

• Kappa Coronae Borealis b

References

• Noyes et al.; Jha, Saurabh; Korzennik, Sylvain G.; Krockenberger, Martin; Nisenson, Peter; Brown, Timothy M.; Kennelly, Edward J.; Horner, Scott D. (1997). "A Planet Orbiting the Star ρ Coronae Borealis". The Astrophysical Journal Letters 483 (2): L111–L114. arXiv:astro-ph/9704248. Bibcode:1997ApJ...483L.111N. doi:10.1086/310754. 
• Butler et al.; Wright, J. T.; Marcy, G. W.; Fischer, D. A.; Vogt, S. S.; Tinney, C. G.; Jones, H. R. A.; Carter, B. D. et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646 (1): 505–522. arXiv:astro-ph/0607493. Bibcode:2006ApJ...646..505B. doi:10.1086/504701. 

External links

• "A Planet Orbiting the Star rho Coronae Borealis". Advanced Fiber Optic Echelle (AFOE). Harvard-Smithsonian Center for Astrophysics. Retrieved 2008-07-03. 
• "Rho Coronae Borealis b". Extrasolar Visions. Retrieved 2008-07-03. 
• "Rho Coronae Borealis". Jumk.de. Retrieved 2008-07-03. 
• "Rho Coronae Borealis". SolStation. Retrieved 2008-07-03.