LHS 475 b
LHS 475 b is a terrestrial planet orbiting the M3.5 V star LHS 475 in the constellation Octans. It lies about 41 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is LHS 475 b?
LHS 475 b has a radius of 0.99 times that of Earth.
Is LHS 475 b in the Habitable Zone?
The position of LHS 475 b relative to the habitable zone of LHS 475 cannot be precisely determined from the available orbital data.
Habitable zone of LHS 475: 0.075–0.195 AU (conservative: 0.094–0.185 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on LHS 475 b
The equilibrium temperature of LHS 475 b is about 586 K (313 °C) — hotter than anywhere on Earth. 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 LHS 475 b — one full orbit around LHS 475 — lasts 2.03 Earth days, shorter than Mercury's 88-day year.
How Was LHS 475 b Discovered?
LHS 475 b was discovered in 2023 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 LHS 475 b?
LHS 475 b is 40.7 light-years (12.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 1986. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 716,320 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. LHS 475 b scores 0.35, ranking #744 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: LHS 475
LHS 475
- Spectral type
- M3.5 V
- Surface temperature
- 3,300 K (Sun: 5,772 K)
- Mass
- 0.26 M☉
- Radius
- 0.28 R☉
Planetary System
LHS 475 b is the only planet known to orbit LHS 475 so far.
LHS 475 b — Complete Data
| Radius | 0.991 Earth radii (0.088 Jupiter radii) |
|---|---|
| Orbital period | 2.03 days |
| Equilibrium temperature | 586 K (313 °C) |
| Earth Similarity Index | 0.35 |
| Distance from Earth | 40.7 light-years (12.5 parsecs) |
| Constellation | Octans |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2023-09-19. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About LHS 475 b
Is LHS 475 b habitable?
LHS 475 b is not known to orbit within the habitable zone of LHS 475, and as a terrestrial planet it is an unlikely candidate for life as we know it.
How far away is LHS 475 b?
LHS 475 b is about 41 light-years from Earth in the constellation Octans. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 716,320 years to get there.
How big is LHS 475 b compared to Earth?
LHS 475 b has 0.99 times the radius of Earth.
How long is a year on LHS 475 b?
One orbit around LHS 475 takes 2.0 Earth days — short enough that 180 of its years would fit into one Earth year.
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