HD 80606

Starbox short
name = HD 80606
epoch = J2000.0
constell = Ursa Major
ra = RA|09|22|37.5679
dec = DEC|+50|36|13.397
appmag_v = +8.93
dist_ly = 190
dist_pc = 58
spectral = G5V
names = Struve 1341 B, HIP 45982
Simbad = HD+80606

HD 80606 is a yellow dwarf star approximately 190 light-years away in the constellation of Ursa Major. The star is part of a binary star system with HD 80607 (the Struve 1341 system), which are both separated at an average distance of 1,200 astronomical units. An extrasolar planet has been confirmed to orbit the star.

Planetary system

Naef's team in 2001 discovered HD 80606 b. [cite journal |author=Naef, D., "et al."|year=2001 |journal=A&A| issue=375 |page= L27] As of June 2007, its orbit remains the most eccentric orbit of any extrasolar planet known. It has an eccentricity of 0.933±0.001, comparable to that of Comet Halley in our solar system. The eccentricity may be a result of the Kozai mechanism, which would occur if the planet's orbit is significantly inclined to that of the binary stars.

As a result of this high eccentricity, the planet's distance from its star varies from 0.03 to 0.84 AU. At apoapsis it would receive an insolation similar to that of Earth, while at periapsis the insolation would be around 800 times greater, far more than that experienced by Mercury in our solar system. This would likely result in extreme seasonal variations.

In a simulation of a 10 million year span, HD 80606 b's orbit "sweeps clean" most test particles within 1.75 AU. The 8:1 resonance hollows out another Kirkwood gap at 1.9 AU. There cannot be any habitable planets in this system. Also, observation has ruled out planets heavier than 0.7 Jupiter mass with a period of one year or less. [cite journal | author=WITTENMYER R., ENDL M., COCHRAN W. & LEVISON H. | year=2007 |title=Dynamical and Observational Constraints on Additional Planets in Highly Eccentric Planetary Systems | journal=Astronomical Journal | volume=134 | url=http://xxx.lanl.gov/PS_cache/arxiv/pdf/0706/0706.1962v1.pdf | page=1276]

PlanetboxOrbit
exoplanet = b
mass = >4.31±0.35
semimajor = 0.468±0.027
period = 111.4487±0.0032
eccentricity = 0.9349±0.0023

See also

* HD 20782
* HD 80607
* Iota Horologii

External links

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