NASA (Exoplanet Catalog artwork)14 Herculis c
One of the coldest imaged exoplanets, in a system whose two planets orbit at crazy angles
Overview
14 Herculis c or 14 Her c is the outermost of two known exoplanets orbiting the star 14 Herculis, approximately 58.4 light-years away in the constellation of Hercules. The planet has a mass that would make it a gas giant roughly the same size as Jupiter but much more massive.
Source: Wikipedia
NASA: HD 145675 c is a gas giant exoplanet that orbits a G-type star. Its mass is 7.9 Jupiters, it takes 43.1 years to complete one orbit of its star, and is 20 AU from its star. Its discovery was announced in 2021.
Why it matters
- JWST imaged it in 2025 at about −3 °C, far colder than most photographed planets.
- Its orbit is tilted by roughly 40 degrees relative to its sibling 14 Herculis b.
- Probably the aftermath of a planet being ejected from the system long ago.
NASA puts it this way: “HD 145675 c is a gas giant exoplanet that orbits a G-type star. Its mass is 5.025 Jupiters, it takes 43.1 years to complete one orbit of its star, and is 11.924 AU from its star. Its discovery was announced in 2021.”
Discovery & system
- Discovered
- 2021 · Radial Velocity · Multiple Observatories
- Discovery paper
- Rosenthal et al. 2021
- Host star
- 14 Her · K0 · 5,338 K · 0.97 M☉
- System
- 2 known planets
- Siblings
- 14 Her b
The system
| World | Period | Distance | Radius | Mass | Temp. |
|---|---|---|---|---|---|
| 14 Her b | 4.8 yr | 2.84 AU | 1.12 R♃ | 8.9 M♃ | 147 K |
| HD 145675 c | 43.1 yr | 20 AU | 1.12 R♃ | 7.9 M♃ | 56 K |
By the numbers
- Radius
- 1.12 R♃12.6 R⊕
- Mass
- 7.9 M♃2,511 M⊕
- Orbital period
- 43.1 yr
- Distance from star
- 20 AU2,992 million km
- Eccentricity
- 0.52highly elliptical
- Equilibrium temp.
- 56 K-218 °C
- Starlight received
- 0 × Earth
- Distance from Earth
- 58.5 ly17.9 pc
- Density
- 6.9 g/cm³1.25 × 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.