HD 135694 b
HD 135694 b is a mini-Neptune orbiting HD 135694 in the constellation Ursa Minor. It lies about 241 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is HD 135694 b?
HD 135694 b has a radius of 2.86 times that of Earth.
Is HD 135694 b in the Habitable Zone?
HD 135694 b orbits inside the inner edge of the habitable zone of HD 135694. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 135694: 0.795–1.877 AU (conservative: 1.007–1.779 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 135694 b
HD 135694 b receives 71.80 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on HD 135694 b — one full orbit around HD 135694 — lasts 15.9 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.125 AU — closer to its star than Mercury is to the Sun.
How Was HD 135694 b Discovered?
HD 135694 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 135694 b?
HD 135694 b is 240.9 light-years (73.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1786. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 4,239,840 years to make the journey.
The Host Star: HD 135694
HD 135694
- Surface temperature
- 5,712 K (Sun: 5,772 K)
- Mass
- 1.02 M☉
- Radius
- 1.08 R☉
Planetary System
HD 135694 b is the only planet known to orbit HD 135694 so far.
HD 135694 b — Complete Data
| Radius | 2.857 Earth radii (0.255 Jupiter radii) |
|---|---|
| Orbital period | 15.92 days |
| Orbital distance | 0.125 AU |
| Stellar irradiation | 71.80× Earth |
| Distance from Earth | 240.9 light-years (73.9 parsecs) |
| Constellation | Ursa Minor |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2024-12-10. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 135694 b
Is HD 135694 b habitable?
No — HD 135694 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 135694 b?
HD 135694 b is about 241 light-years from Earth in the constellation Ursa Minor. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 4,239,840 years to get there.
How big is HD 135694 b compared to Earth?
HD 135694 b has 2.86 times the radius of Earth.
How long is a year on HD 135694 b?
One orbit around HD 135694 takes 15.9 Earth days — short enough that 23 of its years would fit into one Earth year.
Explore HD 135694 b in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
