HD 28254 b
HD 28254 b is a cold gas giant orbiting the G5 V star HD 28254 in the constellation Dorado. It lies about 180 light-years from Earth and was discovered in 2010 using the radial velocity method.
Is HD 28254 b in the Habitable Zone?
The position of HD 28254 b relative to the habitable zone of HD 28254 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 28254 b — one full orbit around HD 28254 — lasts 1,333.0 Earth days, longer than an Earth year. It orbits at an average distance of 2.450 AU. Its orbit is highly elliptical (eccentricity 0.95), swinging dramatically closer to and farther from its star.
How Was HD 28254 b Discovered?
HD 28254 b was discovered in 2010 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 28254 b?
HD 28254 b is 180.3 light-years (55.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1846. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,173,280 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 28254 b scores 0.39, ranking #518 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 28254
HD 28254 b belongs to a system of 2 stars; it orbits HD 28254.
HD 28254
- Spectral type
- G5 V
- Mass
- 1.10 M☉
- Age
- 6.0 billion years (Sun: 4.6)
Planetary System
HD 28254 b is the only planet known to orbit HD 28254 so far.
HD 28254 b — Complete Data
| Mass | 1,207.75 Earth masses (3.800 Jupiter masses) |
|---|---|
| Orbital period | 1,333.00 days |
| Orbital distance | 2.450 AU |
| Eccentricity | 0.950 |
| Earth Similarity Index | 0.39 |
| Distance from Earth | 180.3 light-years (55.3 parsecs) |
| Constellation | Dorado |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2010 |
Data: NASA Exoplanet Archive, last updated 2023-09-05. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 28254 b
Is HD 28254 b habitable?
HD 28254 b is not known to orbit within the habitable zone of HD 28254, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is HD 28254 b?
HD 28254 b is about 180 light-years from Earth in the constellation Dorado. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,173,280 years to get there.
How long is a year on HD 28254 b?
One orbit around HD 28254 takes 1,333.0 Earth days.
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