HD 200964 c
HD 200964 c is a cold gas giant orbiting HD 200964 in the constellation Equuleus. It lies about 237 light-years from Earth and was discovered in 2010 using the radial velocity method.
Is HD 200964 c in the Habitable Zone?
HD 200964 c orbits inside the inner edge of the habitable zone of HD 200964. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 200964: 2.867–6.938 AU (conservative: 3.632–6.578 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 200964 c — one full orbit around HD 200964 — lasts 852.5 Earth days, longer than an Earth year. It orbits at an average distance of 1.960 AU. Its orbit is mildly elliptical (eccentricity 0.24).
How Was HD 200964 c Discovered?
HD 200964 c was discovered in 2010 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 200964 c?
HD 200964 c is 236.8 light-years (72.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1790. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 4,167,680 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 200964 c scores 0.29, ranking #1,877 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 200964
HD 200964
- Surface temperature
- 4,982 K (Sun: 5,772 K)
- Mass
- 1.39 M☉
- Radius
- 4.92 R☉
The HD 200964 Planetary System
HD 200964 c is one of 2 known planets in the HD 200964 system. Its siblings:
- HD 200964 b (Cold Gas Giant)
HD 200964 c — Complete Data
| Mass (best estimate) | 385.85 Earth masses |
|---|---|
| Orbital period | 852.50 days |
| Orbital distance | 1.960 AU |
| Eccentricity | 0.243 |
| Earth Similarity Index | 0.29 |
| Distance from Earth | 236.8 light-years (72.6 parsecs) |
| Constellation | Equuleus |
| Discovery method | Radial Velocity |
| Discovery facility | Lick Observatory |
| Discovery year | 2010 |
Data: NASA Exoplanet Archive, last updated 2018-12-03. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 200964 c
Is HD 200964 c habitable?
No — HD 200964 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 200964 c?
HD 200964 c is about 237 light-years from Earth in the constellation Equuleus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 4,167,680 years to get there.
How long is a year on HD 200964 c?
One orbit around HD 200964 takes 852.5 Earth days.
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