HD 143105 b
HD 143105 b is a hot Jupiter orbiting the F5 star HD 143105 in the constellation Draco. It lies about 153 light-years from Earth and was discovered in 2016 using the radial velocity method.
Is HD 143105 b in the Habitable Zone?
The position of HD 143105 b relative to the habitable zone of HD 143105 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 143105 b — one full orbit around HD 143105 — lasts 2.20 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.038 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.07).
How Was HD 143105 b Discovered?
HD 143105 b was discovered in 2016 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 143105 b?
HD 143105 b is 152.6 light-years (46.8 parsecs) from Earth. Light arriving here tonight left the planet around the year 1874. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,685,760 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 143105 b scores 0.07, ranking #5,032 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 143105
HD 143105
- Spectral type
- F5
- Surface temperature
- 6,380 K (Sun: 5,772 K)
- Mass
- 1.51 M☉
Planetary System
HD 143105 b is the only planet known to orbit HD 143105 so far.
HD 143105 b — Complete Data
| Mass (best estimate) | 384.57 Earth masses |
|---|---|
| Orbital period | 2.20 days |
| Orbital distance | 0.038 AU |
| Eccentricity | 0.070 |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 152.6 light-years (46.8 parsecs) |
| Constellation | Draco |
| Discovery method | Radial Velocity |
| Discovery facility | Haute-Provence Observatory |
| Discovery year | 2016 |
Data: NASA Exoplanet Archive, last updated 2016-02-24. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 143105 b
Is HD 143105 b habitable?
HD 143105 b is not known to orbit within the habitable zone of HD 143105, and as a hot Jupiter it is an unlikely candidate for life as we know it.
How far away is HD 143105 b?
HD 143105 b is about 153 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,685,760 years to get there.
How long is a year on HD 143105 b?
One orbit around HD 143105 takes 2.2 Earth days — short enough that 166 of its years would fit into one Earth year.
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