HD 102329 c
HD 102329 c is a cold gas giant orbiting HD 102329 in the constellation Virgo. It lies about 708 light-years from Earth and was discovered in 2016 using the radial velocity method.
Is HD 102329 c in the Habitable Zone?
The position of HD 102329 c relative to the habitable zone of HD 102329 cannot be precisely determined from the available orbital data.
Habitable zone of HD 102329: 5.247–12.821 AU (conservative: 6.646–12.155 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 102329 c — one full orbit around HD 102329 — lasts 1,123.0 Earth days, longer than an Earth year. Its orbit is mildly elliptical (eccentricity 0.21).
How Was HD 102329 c Discovered?
HD 102329 c was discovered in 2016 using the radial velocity method, with observations from W. M. Keck 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 102329 c?
HD 102329 c is 708.1 light-years (217.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1318. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 12,462,560 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 102329 c scores 0.19, ranking #3,998 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 102329
HD 102329
- Surface temperature
- 4,745 K (Sun: 5,772 K)
- Mass
- 3.21 M☉
- Radius
- 9.82 R☉
The HD 102329 Planetary System
HD 102329 c is one of 2 known planets in the HD 102329 system. Its siblings:
- HD 102329 b (Cold Gas Giant)
HD 102329 c — Complete Data
| Mass (best estimate) | 483.10 Earth masses |
|---|---|
| Orbital period | 1,123.00 days |
| Eccentricity | 0.209 |
| Earth Similarity Index | 0.19 |
| Distance from Earth | 708.1 light-years (217.1 parsecs) |
| Constellation | Virgo |
| Discovery method | Radial Velocity |
| Discovery facility | W. M. Keck Observatory |
| Discovery year | 2016 |
Data: NASA Exoplanet Archive, last updated 2018-11-26. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 102329 c
Is HD 102329 c habitable?
HD 102329 c is not known to orbit within the habitable zone of HD 102329, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is HD 102329 c?
HD 102329 c is about 708 light-years from Earth in the constellation Virgo. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 12,462,560 years to get there.
How long is a year on HD 102329 c?
One orbit around HD 102329 takes 1,123.0 Earth days.
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