NASA (Exoplanet Catalog artwork)HIP 67522 b
The youngest known hot Jupiter — and the first planet seen triggering flares on its star
Overview
HIP 67522 b is a hot Neptune or sub-Saturn exoplanet orbiting the G-type star HIP 67522, approximately 415 light-years from Earth in the constellation Centaurus. It was discovered using the Transiting Exoplanet Survey Satellite (TESS). It is one of the youngest transiting planets of any type, and one of only four others less than 100 million years old to have the angle between its orbit and its host star's rotation measured, at 5.8+2.8−5.7 degrees. This planet, in turn, may help in understanding how other hot Neptunes form.
Source: Wikipedia
NASA: HIP 67522 b is a Neptune-like exoplanet that orbits a G-type star. Its mass is 13.8 Earths, it takes 7 days to complete one orbit of its star, and is 0.0748 AU from its star. Its discovery was announced in 2020.
Why it matters
- Only about 17 million years old, found by TESS in 2020.
- In 2025 astronomers showed its magnetic connection to the star sets off flares as it passes.
- The planet is being blasted by six times more radiation than it otherwise would, and is losing atmosphere.
NASA puts it this way: “HIP 67522 b is a gas giant exoplanet that orbits a G-type star. Its mass is 0.228 Jupiters and it takes 7 days to complete one orbit of its star. Its discovery was announced in 2020.”
Discovery & system
- Discovered
- 2020 · Transit · Transiting Exoplanet Survey Satellite (TESS)
- Discovery paper
- Rizzuto et al. 2020
- Host star
- HIP 67522 · G1 V · 5,675 K · 1.22 M☉
- System
- 2 known planets
- Siblings
- HIP 67522 c
The system
| World | Period | Distance | Radius | Mass | Temp. |
|---|---|---|---|---|---|
| HIP 67522 b | 6.96 d | 0.075 AU | 0.89 R♃ | 13.8 M⊕ | 1,175 K |
| HIP 67522 c | 14.3 d | 0.123 AU | 0.71 R♃ | 22 M⊕ | 917 K |
By the numbers
- Radius
- 0.89 R♃10 R⊕
- Mass
- 13.8 M⊕82.42 ×10²⁴ kg
- Orbital period
- 6.96 d0.02 yr
- Distance from star
- 0.075 AU11.19 million km
- Eccentricity
- 0.064elliptical
- Equilibrium temp.
- 1,175 K902 °C
- Starlight received
- 341 × Earth
- Distance from Earth
- 415 ly127.3 pc
- Density
- 0.08 g/cm³0.01 × Earth
Sources
Image: NASA (Exoplanet Catalog artwork) · NASA media: generally free of copyright · image page
Text: Wikipedia (CC BY-SA 4.0). Taglines and highlights are editorial.