HD 75302 b
HD 75302 b is a cold gas giant orbiting the G5 V star HD 75302 in the constellation Hydra. It lies about 99 light-years from Earth and was discovered in 2023 using the radial velocity method.
Is HD 75302 b in the Habitable Zone?
The position of HD 75302 b relative to the habitable zone of HD 75302 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 75302 b — one full orbit around HD 75302 — lasts 4,356.0 Earth days, longer than Jupiter's 12-year orbit. It orbits at an average distance of 5.300 AU. Its orbit is highly elliptical (eccentricity 0.39), swinging dramatically closer to and farther from its star.
How Was HD 75302 b Discovered?
HD 75302 b was discovered in 2023 using the radial velocity method, with observations from La Silla 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 75302 b?
HD 75302 b is 98.9 light-years (30.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1928. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,740,640 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 75302 b scores 0.10, ranking #4,417 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 75302
HD 75302
- Spectral type
- G5 V
- Mass
- 1.06 M☉
- Age
- 2.1 billion years (Sun: 4.6)
Planetary System
HD 75302 b is the only planet known to orbit HD 75302 so far.
HD 75302 b — Complete Data
| Mass | 1,716.27 Earth masses (5.400 Jupiter masses) |
|---|---|
| Orbital period | 4,356.00 days |
| Orbital distance | 5.300 AU |
| Eccentricity | 0.390 |
| Earth Similarity Index | 0.10 |
| Distance from Earth | 98.9 light-years (30.3 parsecs) |
| Constellation | Hydra |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2023-09-05. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 75302 b
Is HD 75302 b habitable?
HD 75302 b is not known to orbit within the habitable zone of HD 75302, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is HD 75302 b?
HD 75302 b is about 99 light-years from Earth in the constellation Hydra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,740,640 years to get there.
How long is a year on HD 75302 b?
One orbit around HD 75302 takes 4,356.0 Earth days.
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