HD 80606 and HD 80607
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HD 80606 and HD 80607 are a binary star system located about 190 light years away in the constellation Ursa Major. The two stars are separated by a distance of 1200 AU. In 2001 an extrasolar planet in a highly eccentric orbit was detected around HD 80606.
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[edit] HD 80606
| Observation data Equinox J2000.0 |
|
|---|---|
| Constellation | Ursa Major |
| Right ascension | 09h 22m 37s 34.074j |
| Declination | 50° 36' 13" 23.82’’’ |
| Apparent magnitude (V) | +8.93 |
| Distance | 190 ly (58 pc) |
| Spectral type | G5V |
| Other designations | |
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HIP 45982
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HD 80606 is a yellow dwarf star about 190 light-years away in the constellation Ursa Major. HD 80606 has a mass of about 0.9 times that of our sun.
As of 2001 an extrasolar planet is known to be orbiting HD 80606.
[edit] Planet
[edit] HD 80606 b
| Extrasolar planet | Lists of extrasolar planets | |
|---|---|---|
| Orbital elements | ||
| Semimajor axis | (a) | 0.468±0.027 AU |
| Eccentricity | (e) | 0.9349±0.0023 |
| Orbital period | (P) | 111.4487±0.0032 d |
| Inclination | (i) | ?° |
| Longitude of periastron |
(ω) | 301° |
| Time of periastron | (τ) | 2,453,199.0517±0.0056 JD |
| Physical characteristics | ||
| Mass | (m) | >4.31±0.35 MJ |
| Radius | (r) | ? RJ |
| Density | (ρ) | ? kg/m3 |
| Temperature | (T) | ? K |
| Discovery information | ||
| Discovery date | 2001 | |
| Discoverer(s) | Mayor et al. | |
| Detection method | Radial velocity | |
| Discovery status | Published | |
HD 80606 b is an extrasolar planet orbiting the star HD 80606. Discovered in April 2001 by a team lead by Michel Mayor and Didier Queloz, whom discovered 51 Pegasi b. Based on its mass, at least 3 times that of Jupiter, it is likely to be a gas giant.
As of 2001, HD 80606 b has the most eccentric orbit of any extrasolar planet known. It has an eccentricity of 0.927, 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.
[edit] HD 80607
| Observation data Equinox J2000.0 |
|
|---|---|
| Constellation | Ursa Major |
| Right ascension | 09h 22m 39s 43.6j |
| Declination | 50° 36' 13" 55.62’’’ |
| Apparent magnitude (V) | 9.07 |
| Distance | 190 ly (58 pc) |
| Spectral type | G5V |
| Other designations | |
|
HIP 45983
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HD 80607 is a binary companion to HD 80606, located about 1200 AU from HD 80606. It is a yellow dwarf star similar to our Sun.
[edit] See also
[edit] References
- Naef et al. (2001). "HD 80606 b, a planet on an extremely elongated orbit". Astronomy and Astrophysics 375: L27-L30.
- Butler, R. et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646: 505 – 522. (web Preprint)
[edit] External links
- Simbad: HD 80606
- Simbad: HD 80607
- Extrasolar Planets Encyclopaedia: HD 80606
- Extrasolar Visions: HD 80606
- Extrasolar Visions: HD 80606 b
- Systemic
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