HD 25463 b
HD 25463 b is a mini-Neptune orbiting HD 25463 in the constellation Taurus. It lies about 149 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is HD 25463 b?
HD 25463 b has a radius of 2.55 times that of Earth. Its mass is 8.7 times that of Earth, giving it a density of 2.87 g/cm³ — between that of rocky and gaseous planets.
Is HD 25463 b in the Habitable Zone?
HD 25463 b orbits inside the inner edge of the habitable zone of HD 25463. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 25463: 1.249–2.906 AU (conservative: 1.582–2.755 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 ›
Temperature on HD 25463 b
The equilibrium temperature of HD 25463 b is about 1,198 K (925 °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 25463 b — one full orbit around HD 25463 — lasts 7.05 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.076 AU — closer to its star than Mercury is to the Sun.
How Was HD 25463 b Discovered?
HD 25463 b was discovered in 2023 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 25463 b?
HD 25463 b is 148.8 light-years (45.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1878. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,618,880 years to make the journey.
The Host Star: HD 25463
HD 25463
- Surface temperature
- 6,353 K (Sun: 5,772 K)
- Mass
- 1.25 M☉
- Radius
- 1.42 R☉
- Luminosity
- 2.9700 L☉
- Age
- 2.3 billion years (Sun: 4.6)
The HD 25463 Planetary System
HD 25463 b is one of 2 known planets in the HD 25463 system. Its siblings:
- HD 25463 c (Lava World)
HD 25463 b — Complete Data
| Radius | 2.545 Earth radii (0.227 Jupiter radii) |
|---|---|
| Mass | 8.70 Earth masses (0.027 Jupiter masses) |
| Density | 2.87 g/cm³ (Earth: 5.51) |
| Orbital period | 7.05 days |
| Orbital distance | 0.076 AU |
| Equilibrium temperature | 1,198 K (925 °C) |
| Distance from Earth | 148.8 light-years (45.6 parsecs) |
| Constellation | Taurus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2024-07-23. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 25463 b
Is HD 25463 b habitable?
No — HD 25463 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 25463 b?
HD 25463 b is about 149 light-years from Earth in the constellation Taurus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,618,880 years to get there.
How big is HD 25463 b compared to Earth?
HD 25463 b has 2.55 times the radius of Earth and about 8.7 times its mass.
How long is a year on HD 25463 b?
One orbit around HD 25463 takes 7.0 Earth days — short enough that 52 of its years would fit into one Earth year.
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