IRAS 04125+2902 b
IRAS 04125+2902 b is a hot Jupiter orbiting IRAS 04125+2902 in the constellation Taurus. It lies about 519 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is IRAS 04125+2902 b?
IRAS 04125+2902 b has a radius of 10.74 times that of Earth, or 0.96 times the radius of Jupiter.
Is IRAS 04125+2902 b in the Habitable Zone?
IRAS 04125+2902 b orbits inside the inner edge of the habitable zone of IRAS 04125+2902. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of IRAS 04125+2902: 0.553–1.393 AU (conservative: 0.700–1.321 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on IRAS 04125+2902 b
The equilibrium temperature of IRAS 04125+2902 b is about 854 K (581 °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 IRAS 04125+2902 b — one full orbit around IRAS 04125+2902 — lasts 8.83 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.077 AU — closer to its star than Mercury is to the Sun.
How Was IRAS 04125+2902 b Discovered?
IRAS 04125+2902 b was discovered in 2024 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 IRAS 04125+2902 b?
IRAS 04125+2902 b is 519.4 light-years (159.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1507. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 9,141,440 years to make the journey.
The Host Star: IRAS 04125+2902
IRAS 04125+2902 b belongs to a system of 2 stars; it orbits IRAS 04125+2902.
IRAS 04125+2902
- Surface temperature
- 4,080 K (Sun: 5,772 K)
- Mass
- 0.70 M☉
- Radius
- 1.45 R☉
- Luminosity
- 0.4660 L☉
- Age
- 0.0 billion years (Sun: 4.6)
Planetary System
IRAS 04125+2902 b is the only planet known to orbit IRAS 04125+2902 so far.
IRAS 04125+2902 b — Complete Data
| Radius | 10.738 Earth radii (0.958 Jupiter radii) |
|---|---|
| Orbital period | 8.83 days |
| Orbital distance | 0.077 AU |
| Equilibrium temperature | 854 K (581 °C) |
| Distance from Earth | 519.4 light-years (159.2 parsecs) |
| Constellation | Taurus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-12-10. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About IRAS 04125+2902 b
Is IRAS 04125+2902 b habitable?
No — IRAS 04125+2902 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is IRAS 04125+2902 b?
IRAS 04125+2902 b is about 519 light-years from Earth in the constellation Taurus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 9,141,440 years to get there.
How big is IRAS 04125+2902 b compared to Earth?
IRAS 04125+2902 b has 10.74 times the radius of Earth.
How long is a year on IRAS 04125+2902 b?
One orbit around IRAS 04125+2902 takes 8.8 Earth days — short enough that 41 of its years would fit into one Earth year.
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