HD 141399 b
HD 141399 b is a cold gas giant orbiting the K0 star HD 141399 in the constellation Boötes. It lies about 121 light-years from Earth and was discovered in 2014 using the radial velocity method.
Is HD 141399 b in the Habitable Zone?
The position of HD 141399 b relative to the habitable zone of HD 141399 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 141399 b — one full orbit around HD 141399 — lasts 94.4 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 0.415 AU — comparable to the inner Solar System. Its orbit is nearly circular (eccentricity 0.040).
How Was HD 141399 b Discovered?
HD 141399 b was discovered in 2014 using the radial velocity method, with observations from Multiple Observatories.
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 141399 b?
HD 141399 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 141399 b scores 0.16, ranking #4,129 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 141399
HD 141399
- Spectral type
- K0
- Surface temperature
- 5,600 K (Sun: 5,772 K)
- Mass
- 1.07 M☉
The HD 141399 Planetary System
HD 141399 b is one of 4 known planets in the HD 141399 system. Its siblings:
- HD 141399 c (Cold Gas Giant)
- HD 141399 d (Cold Gas Giant)
- HD 141399 e (Cold Gas Giant)
HD 141399 b — Complete Data
| Mass (best estimate) | 143.34 Earth masses |
|---|---|
| Orbital period | 94.44 days |
| Orbital distance | 0.415 AU |
| Eccentricity | 0.040 |
| Earth Similarity Index | 0.16 |
| Distance from Earth | 120.7 light-years (37.0 parsecs) |
| Constellation | Boötes |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2014 |
Data: NASA Exoplanet Archive, last updated 2016-02-24. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 141399 b
Is HD 141399 b habitable?
HD 141399 b is not known to orbit within the habitable zone of HD 141399, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is HD 141399 b?
HD 141399 b is about 121 light-years from Earth in the constellation Boötes. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,124,320 years to get there.
How long is a year on HD 141399 b?
One orbit around HD 141399 takes 94.4 Earth days.
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