HD 192699 b
HD 192699 b is a cold gas giant orbiting HD 192699 in the constellation Aquila. It lies about 234 light-years from Earth and was discovered in 2007 using the radial velocity method.
Is HD 192699 b in the Habitable Zone?
HD 192699 b orbits inside the inner edge of the habitable zone of HD 192699. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 192699: 2.624–6.334 AU (conservative: 3.324–6.005 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Orbit and Year Length
A year on HD 192699 b — one full orbit around HD 192699 — lasts 340.9 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 1.063 AU — comparable to the inner Solar System. Its orbit is mildly elliptical (eccentricity 0.08).
How Was HD 192699 b Discovered?
HD 192699 b was discovered in 2007 using the radial velocity method, with observations from Lick Observatory.
The radial velocity method measures the subtle wobble of a star caused by the gravitational pull of an orbiting planet, visible as periodic shifts in the star's light spectrum. The size of the wobble reveals the planet's minimum mass.
How Far Away Is HD 192699 b?
HD 192699 b is 234.4 light-years (71.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1792. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 4,125,440 years to make the journey.
Earth Similarity Index
The Earth Similarity Index (ESI) scores how physically similar a planet is to Earth, from 0 to 1, based on radius, density, escape velocity and surface temperature. HD 192699 b scores 0.17, ranking #4,100 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 192699
HD 192699
- Surface temperature
- 5,041 K (Sun: 5,772 K)
- Mass
- 1.38 M☉
- Radius
- 4.41 R☉
Planetary System
HD 192699 b is the only planet known to orbit HD 192699 so far.
HD 192699 b — Complete Data
| Mass (best estimate) | 666.17 Earth masses |
|---|---|
| Orbital period | 340.94 days |
| Orbital distance | 1.063 AU |
| Eccentricity | 0.082 |
| Earth Similarity Index | 0.17 |
| Distance from Earth | 234.4 light-years (71.9 parsecs) |
| Constellation | Aquila |
| Discovery method | Radial Velocity |
| Discovery facility | Lick Observatory |
| Discovery year | 2007 |
Data: NASA Exoplanet Archive, last updated 2018-12-03. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 192699 b
Is HD 192699 b habitable?
No — HD 192699 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 192699 b?
HD 192699 b is about 234 light-years from Earth in the constellation Aquila. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 4,125,440 years to get there.
How long is a year on HD 192699 b?
One orbit around HD 192699 takes 340.9 Earth days.
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