TOI-1235 b
TOI-1235 b is a super-Earth orbiting the M0.5 V star TOI-1235 in the constellation Ursa Major. It lies about 129 light-years from Earth and was discovered in 2020 using the transit method.
How Big Is TOI-1235 b?
TOI-1235 b has a radius of 1.69 times that of Earth. Its mass is 6.7 times that of Earth, giving it a density of 7.25 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is TOI-1235 b in the Habitable Zone?
The position of TOI-1235 b relative to the habitable zone of TOI-1235 cannot be precisely determined from the available orbital data.
Habitable zone of TOI-1235: 0.241–0.610 AU (conservative: 0.305–0.578 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-1235 b — one full orbit around TOI-1235 — lasts 3.44 Earth days, shorter than Mercury's 88-day year. Its orbit is nearly circular (eccentricity 0.049).
How Was TOI-1235 b Discovered?
TOI-1235 b was discovered in 2020 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-1235 b?
TOI-1235 b is 129.3 light-years (39.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1897. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,275,680 years to make the journey.
Earth Similarity Index
The Earth Similarity Index (ESI) scores how physically similar a planet is to Earth, from 0 to 1, based on radius, density, escape velocity and surface temperature. TOI-1235 b scores 0.29, ranking #1,706 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-1235
TOI-1235
- Spectral type
- M0.5 V
- Surface temperature
- 3,997 K (Sun: 5,772 K)
- Mass
- 0.63 M☉
- Radius
- 0.62 R☉
- Luminosity
- 0.0883 L☉
- Age
- 5.3 billion years (Sun: 4.6)
Planetary System
TOI-1235 b is the only planet known to orbit TOI-1235 so far.
TOI-1235 b — Complete Data
| Radius | 1.690 Earth radii (0.151 Jupiter radii) |
|---|---|
| Mass | 6.69 Earth masses (0.021 Jupiter masses) |
| Density | 7.25 g/cm³ (Earth: 5.51) |
| Orbital period | 3.44 days |
| Eccentricity | 0.049 |
| Earth Similarity Index | 0.29 |
| Distance from Earth | 129.3 light-years (39.6 parsecs) |
| Constellation | Ursa Major |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2020 |
Data: NASA Exoplanet Archive, last updated 2023-07-10. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1235 b
Is TOI-1235 b habitable?
TOI-1235 b is not known to orbit within the habitable zone of TOI-1235, and as a super-Earth it is an unlikely candidate for life as we know it.
How far away is TOI-1235 b?
TOI-1235 b is about 129 light-years from Earth in the constellation Ursa Major. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,275,680 years to get there.
How big is TOI-1235 b compared to Earth?
TOI-1235 b has 1.69 times the radius of Earth and about 6.7 times its mass.
How long is a year on TOI-1235 b?
One orbit around TOI-1235 takes 3.4 Earth days — short enough that 106 of its years would fit into one Earth year.
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