LHS 1815 b
LHS 1815 b is a terrestrial planet orbiting the M1 star LHS 1815 in the constellation Pictor. It lies about 97 light-years from Earth and was discovered in 2020 using the transit method.
How Big Is LHS 1815 b?
LHS 1815 b has a radius of 1.09 times that of Earth. Its mass is 1.6 times that of Earth, giving it a density of 6.70 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is LHS 1815 b in the Habitable Zone?
The position of LHS 1815 b relative to the habitable zone of LHS 1815 cannot be precisely determined from the available orbital data.
Habitable zone of LHS 1815: 0.165–0.426 AU (conservative: 0.209–0.404 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Orbit and Year Length
A year on LHS 1815 b — one full orbit around LHS 1815 — lasts 3.81 Earth days, shorter than Mercury's 88-day year.
How Was LHS 1815 b Discovered?
LHS 1815 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 LHS 1815 b?
LHS 1815 b is 97.3 light-years (29.8 parsecs) from Earth. Light arriving here tonight left the planet around the year 1929. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,712,480 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 1815 b scores 0.35, ranking #789 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: LHS 1815
LHS 1815
- Spectral type
- M1
- Surface temperature
- 3,643 K (Sun: 5,772 K)
- Mass
- 0.50 M☉
- Radius
- 0.50 R☉
- Luminosity
- 0.0410 L☉
Planetary System
LHS 1815 b is the only planet known to orbit LHS 1815 so far.
LHS 1815 b — Complete Data
| Radius | 1.088 Earth radii (0.097 Jupiter radii) |
|---|---|
| Mass | 1.58 Earth masses (0.005 Jupiter masses) |
| Density | 6.70 g/cm³ (Earth: 5.51) |
| Orbital period | 3.81 days |
| Earth Similarity Index | 0.35 |
| Distance from Earth | 97.3 light-years (29.8 parsecs) |
| Constellation | Pictor |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2020 |
Data: NASA Exoplanet Archive, last updated 2023-07-10. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About LHS 1815 b
Is LHS 1815 b habitable?
LHS 1815 b is not known to orbit within the habitable zone of LHS 1815, and as a terrestrial planet it is an unlikely candidate for life as we know it.
How far away is LHS 1815 b?
LHS 1815 b is about 97 light-years from Earth in the constellation Pictor. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,712,480 years to get there.
How big is LHS 1815 b compared to Earth?
LHS 1815 b has 1.09 times the radius of Earth and about 1.6 times its mass.
How long is a year on LHS 1815 b?
One orbit around LHS 1815 takes 3.8 Earth days — short enough that 96 of its years would fit into one Earth year.
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