TOI-5515 b
TOI-5515 b is a mini-Neptune orbiting TOI-5515 in the constellation Cancer. It lies about 442 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-5515 b?
TOI-5515 b has a radius of 2.65 times that of Earth.
Is TOI-5515 b in the Habitable Zone?
The position of TOI-5515 b relative to the habitable zone of TOI-5515 cannot be precisely determined from the available orbital data.
Habitable zone of TOI-5515: 0.575–1.366 AU (conservative: 0.728–1.295 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 ›
Orbit and Year Length
A year on TOI-5515 b — one full orbit around TOI-5515 — lasts 8.59 Earth days, shorter than Mercury's 88-day year.
How Was TOI-5515 b Discovered?
TOI-5515 b was discovered in 2026 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 TOI-5515 b?
TOI-5515 b is 441.8 light-years (135.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 1585. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 7,775,680 years to make the journey.
The Host Star: TOI-5515
TOI-5515
- Surface temperature
- 5,484 K (Sun: 5,772 K)
- Radius
- 0.84 R☉
Planetary System
TOI-5515 b is the only planet known to orbit TOI-5515 so far.
TOI-5515 b — Complete Data
| Radius | 2.654 Earth radii (0.237 Jupiter radii) |
|---|---|
| Orbital period | 8.59 days |
| Distance from Earth | 441.8 light-years (135.5 parsecs) |
| Constellation | Cancer |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-04-23. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-5515 b
Is TOI-5515 b habitable?
TOI-5515 b is not known to orbit within the habitable zone of TOI-5515, and as a mini-Neptune it is an unlikely candidate for life as we know it.
How far away is TOI-5515 b?
TOI-5515 b is about 442 light-years from Earth in the constellation Cancer. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 7,775,680 years to get there.
How big is TOI-5515 b compared to Earth?
TOI-5515 b has 2.65 times the radius of Earth.
How long is a year on TOI-5515 b?
One orbit around TOI-5515 takes 8.6 Earth days — short enough that 43 of its years would fit into one Earth year.
Explore TOI-5515 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.
