HD 24085 b
HD 24085 b is a Neptune-like planet orbiting the G0 V star HD 24085 in the constellation Hydrus. It lies about 179 light-years from Earth and was discovered in 2019 using the radial velocity method.
Is HD 24085 b in the Habitable Zone?
The position of HD 24085 b relative to the habitable zone of HD 24085 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 24085 b — one full orbit around HD 24085 — lasts 2.05 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.034 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.22).
How Was HD 24085 b Discovered?
HD 24085 b was discovered in 2019 using the radial velocity method, with observations from Las Campanas 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 24085 b?
HD 24085 b is 179.1 light-years (54.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1847. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,152,160 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 24085 b scores 0.19, ranking #3,945 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 24085
HD 24085
- Spectral type
- G0 V
- Surface temperature
- 6,034 K (Sun: 5,772 K)
- Mass
- 1.22 M☉
Planetary System
HD 24085 b is the only planet known to orbit HD 24085 so far.
HD 24085 b — Complete Data
| Mass (best estimate) | 11.80 Earth masses |
|---|---|
| Orbital period | 2.05 days |
| Orbital distance | 0.034 AU |
| Eccentricity | 0.220 |
| Earth Similarity Index | 0.19 |
| Distance from Earth | 179.1 light-years (54.9 parsecs) |
| Constellation | Hydrus |
| Discovery method | Radial Velocity |
| Discovery facility | Las Campanas Observatory |
| Discovery year | 2019 |
Data: NASA Exoplanet Archive, last updated 2019-05-20. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 24085 b
Is HD 24085 b habitable?
HD 24085 b is not known to orbit within the habitable zone of HD 24085, and as a Neptune-like planet it is an unlikely candidate for life as we know it.
How far away is HD 24085 b?
HD 24085 b is about 179 light-years from Earth in the constellation Hydrus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,152,160 years to get there.
How long is a year on HD 24085 b?
One orbit around HD 24085 takes 2.0 Earth days — short enough that 179 of its years would fit into one Earth year.
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