HD 110067 d
HD 110067 d is a mini-Neptune orbiting the K0.0 V star HD 110067 in the constellation Coma Berenices. It lies about 105 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is HD 110067 d?
HD 110067 d has a radius of 2.85 times that of Earth. Its mass is 8.5 times that of Earth.
Is HD 110067 d in the Habitable Zone?
HD 110067 d orbits inside the inner edge of the habitable zone of HD 110067. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 110067: 0.506–1.211 AU (conservative: 0.641–1.148 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on HD 110067 d
The equilibrium temperature of HD 110067 d is about 602 K (329 °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 HD 110067 d — one full orbit around HD 110067 — lasts 20.5 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.136 AU — closer to its star than Mercury is to the Sun.
How Was HD 110067 d Discovered?
HD 110067 d was discovered in 2023 using the transit method, with observations from Multiple Observatories.
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 HD 110067 d?
HD 110067 d is 104.9 light-years (32.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1922. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,846,240 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 110067 d scores 0.27, ranking #2,694 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 110067
HD 110067 d belongs to a system of 3 stars; it orbits HD 110067.
HD 110067
- Spectral type
- K0.0 V
- Surface temperature
- 5,266 K (Sun: 5,772 K)
- Mass
- 0.80 M☉
- Radius
- 0.79 R☉
- Age
- 8.1 billion years (Sun: 4.6)
The HD 110067 Planetary System
HD 110067 d is one of 6 known planets in the HD 110067 system. Its siblings:
- HD 110067 b (Mini Neptune)
- HD 110067 c (Mini Neptune)
- HD 110067 e (Mini Neptune)
- HD 110067 f (Mini Neptune)
- HD 110067 g (Mini Neptune)
HD 110067 d — Complete Data
| Radius | 2.852 Earth radii (0.254 Jupiter radii) |
|---|---|
| Mass | 8.52 Earth masses (0.027 Jupiter masses) |
| Orbital period | 20.52 days |
| Orbital distance | 0.136 AU |
| Equilibrium temperature | 602 K (329 °C) |
| Earth Similarity Index | 0.27 |
| Distance from Earth | 104.9 light-years (32.2 parsecs) |
| Constellation | Coma Berenices |
| Discovery method | Transit |
| Discovery facility | Multiple Observatories |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2023-12-05. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 110067 d
Is HD 110067 d habitable?
No — HD 110067 d orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 110067 d?
HD 110067 d is about 105 light-years from Earth in the constellation Coma Berenices. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,846,240 years to get there.
How big is HD 110067 d compared to Earth?
HD 110067 d has 2.85 times the radius of Earth and about 8.5 times its mass.
How long is a year on HD 110067 d?
One orbit around HD 110067 takes 20.5 Earth days — short enough that 18 of its years would fit into one Earth year.
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