HD 75898 b
HD 75898 b is a cold gas giant orbiting the F8 V star HD 75898 in the constellation Lynx. It lies about 255 light-years from Earth and was discovered in 2007 using the radial velocity method.
Is HD 75898 b in the Habitable Zone?
The position of HD 75898 b relative to the habitable zone of HD 75898 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 75898 b — one full orbit around HD 75898 — lasts 422.8 Earth days, longer than an Earth year. It orbits at an average distance of 1.203 AU. Its orbit is mildly elliptical (eccentricity 0.11).
How Was HD 75898 b Discovered?
HD 75898 b was discovered in 2007 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 75898 b?
HD 75898 b is 254.6 light-years (78.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1772. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 4,480,960 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 75898 b scores 0.35, ranking #795 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 75898
HD 75898
- Spectral type
- F8 V
- Surface temperature
- 6,122 K (Sun: 5,772 K)
- Mass
- 1.30 M☉
- Age
- 3.2 billion years (Sun: 4.6)
The HD 75898 Planetary System
HD 75898 b is one of 2 known planets in the HD 75898 system. Its siblings:
- HD 75898 c (Cold Gas Giant)
HD 75898 b — Complete Data
| Mass (best estimate) | 810.46 Earth masses |
|---|---|
| Orbital period | 422.82 days |
| Orbital distance | 1.203 AU |
| Eccentricity | 0.105 |
| Earth Similarity Index | 0.35 |
| Distance from Earth | 254.6 light-years (78.1 parsecs) |
| Constellation | Lynx |
| Discovery method | Radial Velocity |
| Discovery facility | W. M. Keck Observatory |
| Discovery year | 2007 |
Data: NASA Exoplanet Archive, last updated 2024-10-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 75898 b
Is HD 75898 b habitable?
HD 75898 b is not known to orbit within the habitable zone of HD 75898, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is HD 75898 b?
HD 75898 b is about 255 light-years from Earth in the constellation Lynx. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 4,480,960 years to get there.
How long is a year on HD 75898 b?
One orbit around HD 75898 takes 422.8 Earth days.
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