Rho Coronae Borealis

Starbox begin
name = Rho Coronae BorealisStarbox observe
epoch = J2000.0
constell = Corona Borealis
ra = RA|16|01|02.6616
dec = DEC|+33|18|12.634
appmag_v = 5.4Starbox character
class = G0-2Va
b-v = 0.61
variable = "None"Starbox astrometry
radial_v = 18.4
prop_mo_ra = -196.88
prop_mo_dec = -773.00
parallax = 57.38
p_error = 0.71
dist_ly =
dist_pc =
absmag_v = 6.04Starbox detail
source =
mass = 0.95
radius = 1.35
gravity =
luminosity = 1.8
temperature =
metal =
rotation =
age = 6 billionStarbox catalog
names = 15 Coronae Borealis, 2MASS J16010264+3318124, BD+33°2663, CCDM J16011+3318A, GC 21527, GJ 9537, HD 143761, HIP 78459, HR 5968, LTT 14764, Rho Coronae Borealis, SAO 65024Starbox reference
Simbad = HD+143761
ARICNS =

Rho Coronae Borealis (ρ CrB / ρ Coronae Borealis) is a Solar twin, yellow dwarf star approximately 57 light-years away in the constellation of Corona Borealis. The star is though to be similar to the Sun with nearly similar mass, radius, and luminosity. As of 1997, an extrasolar planet has been confirmed to be orbiting the star. Furthermore, in 1997 the star was observed radiating excessively in certain infrared wavelengths indicating a circumstellar disk around the star (similar to the Kuiper belt in the Solar system). It is though that the star may have a stellar companion, but it may be just an optical companion.

Stellar components

Rho Coronae Borealis is a Solar twin, yellow dwarf star of the spectral type "G0-2Va". The star is though to have only 95 percent of the Sun's mass, along with 1.31 times its radius and 1.61 of its luminosity. It may only be 51 to 65 percent as enriched with elements heavier than hydrogen (based on its abundance of iron) and may be much older than the Sun at around six billion years old.

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 unprobable, and the claim has not been backed up.

Planetary system

OrbitboxPlanet
exoplanet = b
mass = >1.093±0.098
semimajor = 0.229±0.013
period = 39.8449±0.0063
eccentricity = 0.057±0.028OrbitboxPlanet disk
disk = Debris disk
periapsis = 40
apoapsis = 85

Planet

The planet, one of the first discovered (discovered on April 24, 1997), is designated as Rho Coronae Borealis b. 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. If the planet orbits in the same plane as the circumstellar disk, the inclination would be about 46° and mass of the planet 1.5 times Jupiter.

Circumstellar disk

In October 1999, astronomers at the University of Arizona confirmed the existence of a circumstellar disk that may be similar in composition to the Kuiper Belt of the Solar system. The disk may extend out to 85 astronomical units out from Rho Coronae Borealis (which is beyond the orbital distances of Neptune and Pluto from the Sun). It is inclined at about 46° from Earth's line of sight.

See also

* 51 Pegasi
* 55 Cancri
* Kappa Coronae Borealis

References

*cite journal | url=http://www.journals.uchicago.edu/doi/full/10.1086/310754 | author=Noyes "et al." | title=A Planet Orbiting the Star ρ Coronae Borealis | journal=The Astrophysical Journal Letters | year=1997 | volume=483 | issue=2 | pages=L111–L114 | doi=10.1086/310754
*cite journal | url=http://www.journals.uchicago.edu/doi/full/10.1086/504701 | author=Butler "et al." | title=Catalog of Nearby Exoplanets | journal=The Astrophysical Journal |volume=646 | issue=1 | pages=505–522 | year=2006 | doi=10.1086/504701

External links

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** [http://www.extrasolar.net/planettour.asp?StarCatId=normal&PlanetId=102 R CrB Kuiper belt]
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