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Planet profiles

HD 110067 c

Barren · 105 light-years away · Last reviewed October 14, 2026

HD 110067 c rendered in TerraForge from its measured mass, orbit and star
TerraForge's rendering of HD 110067 c, generated by our physics engine from its measured mass, size, orbit and star. An illustration of what the science suggests, not a photograph.
TerraForge classification
Barren
Host star
HD 110067 (K0.0 V)
Distance
105 light-years
Orbit
13.7 days
Mass
6.3 × Earth
Radius
2.39 × Earth
Discovered
2023, transit

Figures from the NASA Exoplanet Archive. The classification is TerraForge’s, from its physics model.

HD 110067 c is the second of six sub-Neptunes, planets between Earth and Neptune in size, that cross in front of HD 110067, a star a little smaller than the Sun about 100 light-years away. It orbits every 13.67 days, almost exactly one and a half times the period of its inner neighbour HD 110067 b, and is about 2.4 times Earth's width.

It was part of the 3 to 2 rhythm that a team led by Rafael Luque found among the three inner planets, using TESS and CHEOPS, which let them predict and then confirm the outer three in 2023. Luque's team could not measure HD 110067 c's mass from the star's wobble and set only an upper limit. In 2024 a team led by Caleb Lammers showed that the system is almost certainly in a chain of resonances, because similar systems that are not in resonance nearly always become unstable within 25 million years. That also let them set lower limits on the masses that had not yet been measured.

HD 110067 c's orbit has also been compared with the spin of its star. In 2024 a team led by J. Zak watched it cross the star with the ESPRESSO spectrograph, which can tell which side of the rotating star the planet blocks. They found its orbit well aligned with the star's equator, suggesting the planets drifted gently into their places without major disruptions. They also found that its transit arrived about 19 minutes off the predicted time, a sign of the planets tugging on each other. It receives about 40 times the light Earth gets from the Sun, far too much for liquid water.

Sources

  1. A resonant sextuplet of sub-Neptunes transiting the bright star HD 110067 — arXiv (Nature)
  2. ESA's Cheops helps unlock rare six-planet system — European Space Agency
  3. The six-planet resonant chain of HD 110067 — arXiv (The Astronomical Journal)
  4. HD 110067 c has an aligned orbit — arXiv (Astronomy & Astrophysics)
A banded gas giant with four moons in different colors: a yellow sulfur moon, two rust-red rock moons and a blue water moon

New: Choose What Your Moons Are Made Of 🌙

Every moon used to be grey rock, white ice or blue ocean, decided for you. Now each one has a "Made of" choice in the builder's Moons tab — silicate rock, iron, water ice, carbon, sulfur, or nitrogen and methane ice — and the physics decides what that becomes. Put water ice too close to the star and it boils off to bare rock. Put sulfur where a neighbouring moon keeps it tidally flexed and it erupts in Io's yellows. Give a Titan-sized moon nitrogen ice far from the sun and it wraps itself in haze. Hang a water moon about the mass of Earth off a giant planet in the habitable zone and it can hold air and open seas — scored for life on the same scale as a planet, with a day as long as its orbit. A tint slider nudges the colour, but only as far as that material could really go.

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