HD 29021 b
HD 29021 b is a cold gas giant orbiting the G5 star HD 29021 in the constellation Camelopardalis. It lies about 101 light-years from Earth and was discovered in 2017 using the radial velocity method.
Is HD 29021 b in the Habitable Zone?
The position of HD 29021 b relative to the habitable zone of HD 29021 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 29021 b — one full orbit around HD 29021 — lasts 1,365.0 Earth days, longer than an Earth year. It orbits at an average distance of 2.294 AU. Its orbit is highly elliptical (eccentricity 0.45), swinging dramatically closer to and farther from its star.
How Was HD 29021 b Discovered?
HD 29021 b was discovered in 2017 using the radial velocity method, with observations from Haute-Provence 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 29021 b?
HD 29021 b is 101.1 light-years (31.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1925. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,779,360 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 29021 b scores 0.20, ranking #3,926 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 29021
HD 29021
- Spectral type
- G5
- Mass
- 0.86 M☉
- Luminosity
- 0.6590 L☉
- Age
- 5.5 billion years (Sun: 4.6)
Planetary System
HD 29021 b is the only planet known to orbit HD 29021 so far.
HD 29021 b — Complete Data
| Mass | 1,420.69 Earth masses (4.470 Jupiter masses) |
|---|---|
| Orbital period | 1,365.00 days |
| Orbital distance | 2.294 AU |
| Eccentricity | 0.453 |
| Earth Similarity Index | 0.20 |
| Distance from Earth | 101.1 light-years (31.0 parsecs) |
| Constellation | Camelopardalis |
| Discovery method | Radial Velocity |
| Discovery facility | Haute-Provence Observatory |
| Discovery year | 2017 |
Data: NASA Exoplanet Archive, last updated 2022-06-27. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 29021 b
Is HD 29021 b habitable?
HD 29021 b is not known to orbit within the habitable zone of HD 29021, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is HD 29021 b?
HD 29021 b is about 101 light-years from Earth in the constellation Camelopardalis. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,779,360 years to get there.
How long is a year on HD 29021 b?
One orbit around HD 29021 takes 1,365.0 Earth days.
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