HD 136352 d
HD 136352 d is a mini-Neptune orbiting HD 136352 in the constellation Lupus. It lies about 48 light-years from Earth and was discovered in 2019 using the radial velocity method.
How Big Is HD 136352 d?
HD 136352 d has a radius of 2.56 times that of Earth. Its mass is 8.8 times that of Earth, giving it a density of 2.88 g/cm³ — between that of rocky and gaseous planets.
Is HD 136352 d in the Habitable Zone?
HD 136352 d orbits inside the inner edge of the habitable zone of HD 136352. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 136352: 0.770–1.819 AU (conservative: 0.975–1.725 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on HD 136352 d
The equilibrium temperature of HD 136352 d is about 431 K (158 °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. It receives 5.74 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on HD 136352 d — one full orbit around HD 136352 — lasts 107.2 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 0.425 AU — comparable to the inner Solar System.
How Was HD 136352 d Discovered?
HD 136352 d was discovered in 2019 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 136352 d?
HD 136352 d is 47.9 light-years (14.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1979. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 843,040 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 136352 d scores 0.41, ranking #426 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 136352
HD 136352
- Surface temperature
- 5,664 K (Sun: 5,772 K)
- Mass
- 0.87 M☉
- Radius
- 1.06 R☉
- Luminosity
- 1.0380 L☉
- Age
- 12.3 billion years (Sun: 4.6)
The HD 136352 Planetary System
HD 136352 d is one of 3 known planets in the HD 136352 system. Its siblings:
- HD 136352 b (Super Earth)
- HD 136352 c (Mini Neptune)
HD 136352 d — Complete Data
| Radius | 2.562 Earth radii (0.229 Jupiter radii) |
|---|---|
| Mass | 8.82 Earth masses (0.028 Jupiter masses) |
| Density | 2.88 g/cm³ (Earth: 5.51) |
| Orbital period | 107.25 days |
| Orbital distance | 0.425 AU |
| Equilibrium temperature | 431 K (158 °C) |
| Stellar irradiation | 5.74× Earth |
| Earth Similarity Index | 0.41 |
| Distance from Earth | 47.9 light-years (14.7 parsecs) |
| Constellation | Lupus |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2019 |
Data: NASA Exoplanet Archive, last updated 2021-08-09. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 136352 d
Is HD 136352 d habitable?
No — HD 136352 d orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 136352 d?
HD 136352 d is about 48 light-years from Earth in the constellation Lupus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 843,040 years to get there.
How big is HD 136352 d compared to Earth?
HD 136352 d has 2.56 times the radius of Earth and about 8.8 times its mass.
How long is a year on HD 136352 d?
One orbit around HD 136352 takes 107.2 Earth days.
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