HD 93963 A c
HD 93963 A c is a super-Earth orbiting HD 93963 A in the constellation Leo Minor. It lies about 269 light-years from Earth and was discovered in 2022 using the transit method.
How Big Is HD 93963 A c?
HD 93963 A c has a radius of 3.12 times that of Earth. Its mass is 18.4 times that of Earth, giving it a density of 3.31 g/cm³ — between that of rocky and gaseous planets.
Is HD 93963 A c in the Habitable Zone?
HD 93963 A c orbits inside the inner edge of the habitable zone of HD 93963 A. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 93963 A: 0.805–1.890 AU (conservative: 1.020–1.792 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on HD 93963 A c
The equilibrium temperature of HD 93963 A c is about 1,212 K (939 °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 93963 A c — one full orbit around HD 93963 A — lasts 3.65 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.047 AU — closer to its star than Mercury is to the Sun.
How Was HD 93963 A c Discovered?
HD 93963 A c was discovered in 2022 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 HD 93963 A c?
HD 93963 A c is 268.6 light-years (82.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1758. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 4,727,360 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 93963 A c scores 0.20, ranking #3,851 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 93963 A
HD 93963 A c belongs to a system of 2 stars; it orbits HD 93963 A.
HD 93963 A
- Surface temperature
- 5,908 K (Sun: 5,772 K)
- Mass
- 1.08 M☉
- Radius
- 1.03 R☉
- Luminosity
- 1.1690 L☉
- Age
- 1.3 billion years (Sun: 4.6)
The HD 93963 A Planetary System
HD 93963 A c is one of 2 known planets in the HD 93963 A system. Its siblings:
- HD 93963 A b (Lava World)
HD 93963 A c — Complete Data
| Radius | 3.120 Earth radii (0.278 Jupiter radii) |
|---|---|
| Mass | 18.40 Earth masses (0.058 Jupiter masses) |
| Density | 3.31 g/cm³ (Earth: 5.51) |
| Orbital period | 3.65 days |
| Orbital distance | 0.047 AU |
| Equilibrium temperature | 1,212 K (939 °C) |
| Earth Similarity Index | 0.20 |
| Distance from Earth | 268.6 light-years (82.3 parsecs) |
| Constellation | Leo Minor |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2024-07-22. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 93963 A c
Is HD 93963 A c habitable?
No — HD 93963 A c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 93963 A c?
HD 93963 A c is about 269 light-years from Earth in the constellation Leo Minor. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 4,727,360 years to get there.
How big is HD 93963 A c compared to Earth?
HD 93963 A c has 3.12 times the radius of Earth and about 18.4 times its mass.
How long is a year on HD 93963 A c?
One orbit around HD 93963 A takes 3.6 Earth days — short enough that 100 of its years would fit into one Earth year.
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