HD 147018 b
HD 147018 b is a cold gas giant orbiting the G9 V star HD 147018 in the constellation Triangulum Australe. It lies about 132 light-years from Earth and was discovered in 2009 using the radial velocity method.
Is HD 147018 b in the Habitable Zone?
The position of HD 147018 b relative to the habitable zone of HD 147018 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 147018 b — one full orbit around HD 147018 — lasts 44.2 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.239 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.47), swinging dramatically closer to and farther from its star.
How Was HD 147018 b Discovered?
HD 147018 b was discovered in 2009 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 147018 b?
HD 147018 b is 131.9 light-years (40.4 parsecs) from Earth. Light arriving here tonight left the planet around the year 1895. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,321,440 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 147018 b scores 0.14, ranking #4,268 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 147018
HD 147018
- Spectral type
- G9 V
- Surface temperature
- 5,441 K (Sun: 5,772 K)
- Mass
- 0.93 M☉
- Age
- 6.4 billion years (Sun: 4.6)
The HD 147018 Planetary System
HD 147018 b is one of 2 known planets in the HD 147018 system. Its siblings:
- HD 147018 c (Cold Gas Giant)
HD 147018 b — Complete Data
| Mass (best estimate) | 674.00 Earth masses |
|---|---|
| Orbital period | 44.24 days |
| Orbital distance | 0.239 AU |
| Eccentricity | 0.469 |
| Earth Similarity Index | 0.14 |
| Distance from Earth | 131.9 light-years (40.4 parsecs) |
| Constellation | Triangulum Australe |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2009 |
Data: NASA Exoplanet Archive, last updated 2019-01-28. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 147018 b
Is HD 147018 b habitable?
HD 147018 b is not known to orbit within the habitable zone of HD 147018, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is HD 147018 b?
HD 147018 b is about 132 light-years from Earth in the constellation Triangulum Australe. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,321,440 years to get there.
How long is a year on HD 147018 b?
One orbit around HD 147018 takes 44.2 Earth days.
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