HD 29985 b
HD 29985 b is a cold gas giant orbiting HD 29985 in the constellation Caelum. It lies about 102 light-years from Earth and was discovered in 2022 using the radial velocity method.
Is HD 29985 b in the Habitable Zone?
The position of HD 29985 b relative to the habitable zone of HD 29985 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 29985 b — one full orbit around HD 29985 — lasts 20,608.1 Earth days, longer than Jupiter's 12-year orbit. It orbits at an average distance of 13.390 AU. Its orbit is mildly elliptical (eccentricity 0.26).
How Was HD 29985 b Discovered?
HD 29985 b was discovered in 2022 using the radial velocity method, with observations from Multiple Observatories.
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 29985 b?
HD 29985 b is 102.0 light-years (31.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1924. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,795,200 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 29985 b scores 0.07, ranking #4,931 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 29985
HD 29985
- Mass
- 0.75 M☉
Planetary System
HD 29985 b is the only planet known to orbit HD 29985 so far.
HD 29985 b — Complete Data
| Mass | 1,739.47 Earth masses (5.473 Jupiter masses) |
|---|---|
| Orbital period | 20,608.14 days |
| Orbital distance | 13.390 AU |
| Eccentricity | 0.261 |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 102.0 light-years (31.3 parsecs) |
| Constellation | Caelum |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2023-06-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 29985 b
Is HD 29985 b habitable?
HD 29985 b is not known to orbit within the habitable zone of HD 29985, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is HD 29985 b?
HD 29985 b is about 102 light-years from Earth in the constellation Caelum. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,795,200 years to get there.
How long is a year on HD 29985 b?
One orbit around HD 29985 takes 20,608.1 Earth days.
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