LP 714-47 b
LP 714-47 b is a Neptune-like planet orbiting the M0.0 V star LP 714-47 in the constellation Eridanus. It lies about 172 light-years from Earth and was discovered in 2020 using the transit method.
How Big Is LP 714-47 b?
LP 714-47 b has a radius of 4.70 times that of Earth. Its mass is 30.8 times that of Earth, giving it a density of 1.70 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is LP 714-47 b in the Habitable Zone?
LP 714-47 b orbits inside the inner edge of the habitable zone of LP 714-47. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of LP 714-47: 0.222–0.564 AU (conservative: 0.282–0.535 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on LP 714-47 b
The equilibrium temperature of LP 714-47 b is about 700 K (427 °C) — hot enough to melt many metals. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C.
Orbit and Year Length
A year on LP 714-47 b — one full orbit around LP 714-47 — lasts 4.05 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.042 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.040).
How Was LP 714-47 b Discovered?
LP 714-47 b was discovered in 2020 using the transit method, with observations from Transiting Exoplanet Survey Satellite (TESS).
The transit method watches a star for the tiny, regular dip in brightness that occurs when a planet crosses in front of it. The depth and timing of these dips reveal the planet's size and orbital period.
How Far Away Is LP 714-47 b?
LP 714-47 b is 171.6 light-years (52.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1855. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,020,160 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. LP 714-47 b scores 0.18, ranking #4,019 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: LP 714-47
LP 714-47
- Spectral type
- M0.0 V
- Surface temperature
- 3,950 K (Sun: 5,772 K)
- Mass
- 0.59 M☉
- Radius
- 0.58 R☉
- Luminosity
- 0.0750 L☉
Planetary System
LP 714-47 b is the only planet known to orbit LP 714-47 so far.
LP 714-47 b — Complete Data
| Radius | 4.700 Earth radii (0.419 Jupiter radii) |
|---|---|
| Mass | 30.80 Earth masses (0.097 Jupiter masses) |
| Density | 1.70 g/cm³ (Earth: 5.51) |
| Orbital period | 4.05 days |
| Orbital distance | 0.042 AU |
| Eccentricity | 0.040 |
| Equilibrium temperature | 700 K (427 °C) |
| Earth Similarity Index | 0.18 |
| Distance from Earth | 171.6 light-years (52.6 parsecs) |
| Constellation | Eridanus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2020 |
Data: NASA Exoplanet Archive, last updated 2020-12-10. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About LP 714-47 b
Is LP 714-47 b habitable?
No — LP 714-47 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is LP 714-47 b?
LP 714-47 b is about 172 light-years from Earth in the constellation Eridanus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,020,160 years to get there.
How big is LP 714-47 b compared to Earth?
LP 714-47 b has 4.70 times the radius of Earth and about 30.8 times its mass.
How long is a year on LP 714-47 b?
One orbit around LP 714-47 takes 4.1 Earth days — short enough that 90 of its years would fit into one Earth year.
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