HD 95338 b
HD 95338 b is a Neptune-like planet orbiting HD 95338 in the constellation Vela. It lies about 121 light-years from Earth and was discovered in 2020 using the radial velocity method.
How Big Is HD 95338 b?
HD 95338 b has a radius of 4.27 times that of Earth.
Is HD 95338 b in the Habitable Zone?
The position of HD 95338 b relative to the habitable zone of HD 95338 cannot be precisely determined from the available orbital data.
Habitable zone of HD 95338: 0.527–1.268 AU (conservative: 0.667–1.202 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Orbit and Year Length
A year on HD 95338 b — one full orbit around HD 95338 — lasts 55.1 Earth days, shorter than Mercury's 88-day year.
How Was HD 95338 b Discovered?
HD 95338 b was discovered in 2020 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 95338 b?
HD 95338 b is 120.7 light-years (37.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1906. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,124,320 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 95338 b scores 0.32, ranking #1,015 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 95338
HD 95338
- Surface temperature
- 5,097 K (Sun: 5,772 K)
- Mass
- 0.85 M☉
- Radius
- 0.87 R☉
- Age
- 9.5 billion years (Sun: 4.6)
Planetary System
HD 95338 b is the only planet known to orbit HD 95338 so far.
HD 95338 b — Complete Data
| Radius | 4.272 Earth radii (0.381 Jupiter radii) |
|---|---|
| Orbital period | 55.08 days |
| Earth Similarity Index | 0.32 |
| Distance from Earth | 120.7 light-years (37.0 parsecs) |
| Constellation | Vela |
| Discovery method | Radial Velocity |
| Discovery facility | Las Campanas Observatory |
| Discovery year | 2020 |
Data: NASA Exoplanet Archive, last updated 2025-12-11. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 95338 b
Is HD 95338 b habitable?
HD 95338 b is not known to orbit within the habitable zone of HD 95338, and as a Neptune-like planet it is an unlikely candidate for life as we know it.
How far away is HD 95338 b?
HD 95338 b is about 121 light-years from Earth in the constellation Vela. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,124,320 years to get there.
How big is HD 95338 b compared to Earth?
HD 95338 b has 4.27 times the radius of Earth.
How long is a year on HD 95338 b?
One orbit around HD 95338 takes 55.1 Earth days.
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