NASA (Exoplanet Catalog artwork)HD 80606 b
A planet on a comet-like orbit that is flash-heated by 700 degrees in hours
Overview
HD 80606 b is an eccentric hot Jupiter 217 light-years from the Sun in the constellation of Ursa Major. HD 80606 b was discovered orbiting the star HD 80606 in April 2001 by a team led by Michel Mayor and Didier Queloz. With a mass 4 times that of Jupiter, it is a gas giant. Because the planet transits the host star its radius can be determined using the transit method, and was found to be about the same as Jupiter's. Its density is slightly less than Earth's. It has an extremely eccentric orbit like a comet, with its orbit taking it very close to its star and then back out very far away from it every 111 days.
Source: Wikipedia
NASA: HD 80606 b is a gas giant exoplanet that orbits a G-type star. Its mass is 4.1641 Jupiters, it takes 111.4 days to complete one orbit of its star, and is 0.4603 AU from its star. Its discovery was announced in 2001.
Why it matters
- Eccentricity 0.93: it swings from 0.03 AU to 0.88 AU on every 111-day orbit.
- Spitzer watched its temperature jump from about 800 K to 1,500 K in six hours at periastron.
- Its orbit was probably driven by the Kozai effect from the companion star HD 80607.
NASA puts it this way: “HD 80606 b is a gas giant exoplanet that orbits a G-type star. Its mass is 4.38 Jupiters, it takes 111.4 days to complete one orbit of its star, and is 0.4565 AU from its star. Its discovery was announced in 2001.”
Discovery & system
- Discovered
- 2001 · Radial Velocity · Multiple Observatories
- Discovery paper
- Naef et al. 2001
- Host star
- HD 80606 · G5 · 5,565 K · 1.05 M☉
- System
- 1 known planet, 2 stars
The system
| World | Period | Distance | Radius | Mass | Temp. |
|---|---|---|---|---|---|
| HD 80606 b | 111.4 d | 0.46 AU | 1.03 R♃ | 4.16 M♃ | 405 K |
By the numbers
- Radius
- 1.03 R♃11.6 R⊕
- Mass
- 4.16 M♃1,323 M⊕
- Orbital period
- 111.4 d0.31 yr
- Distance from star
- 0.46 AU69 million km
- Eccentricity
- 0.932highly elliptical
- Equilibrium temp.
- 405 K132 °C
- Starlight received
- 5 × Earth
- Distance from Earth
- 217 ly66.5 pc
- Density
- 5.08 g/cm³0.92 × Earth
Sources
Image: NASA (Exoplanet Catalog artwork) · NASA media: generally free of copyright · image page
Text: Wikipedia (CC BY-SA 4.0). Taglines and highlights are editorial.