TOI-1742 b
TOI-1742 b is a super-Earth orbiting TOI-1742 in the constellation Draco. It lies about 238 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-1742 b?
TOI-1742 b has a radius of 2.37 times that of Earth. Its mass is 9.7 times that of Earth, giving it a density of 4.00 g/cm³ — between that of rocky and gaseous planets.
Is TOI-1742 b in the Habitable Zone?
TOI-1742 b orbits inside the inner edge of the habitable zone of TOI-1742. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1742: 0.861–2.026 AU (conservative: 1.090–1.921 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 TOI-1742 b
The equilibrium temperature of TOI-1742 b is about 694 K (421 °C) — hot enough to melt many metals. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C.
Orbit and Year Length
A year on TOI-1742 b — one full orbit around TOI-1742 — lasts 21.3 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.154 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.30), swinging dramatically closer to and farther from its star.
How Was TOI-1742 b Discovered?
TOI-1742 b was discovered in 2024 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-1742 b?
TOI-1742 b is 237.7 light-years (72.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1789. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 4,183,520 years to make the journey.
The Host Star: TOI-1742
TOI-1742
- Surface temperature
- 5,815 K (Sun: 5,772 K)
- Mass
- 1.09 M☉
- Radius
- 1.13 R☉
- Luminosity
- 1.3220 L☉
- Age
- 3.9 billion years (Sun: 4.6)
Planetary System
TOI-1742 b is the only planet known to orbit TOI-1742 so far.
TOI-1742 b — Complete Data
| Radius | 2.365 Earth radii (0.211 Jupiter radii) |
|---|---|
| Mass | 9.70 Earth masses (0.031 Jupiter masses) |
| Density | 4.00 g/cm³ (Earth: 5.51) |
| Orbital period | 21.27 days |
| Orbital distance | 0.154 AU |
| Eccentricity | 0.300 |
| Equilibrium temperature | 694 K (421 °C) |
| Distance from Earth | 237.7 light-years (72.9 parsecs) |
| Constellation | Draco |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-07-23. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1742 b
Is TOI-1742 b habitable?
No — TOI-1742 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1742 b?
TOI-1742 b is about 238 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 4,183,520 years to get there.
How big is TOI-1742 b compared to Earth?
TOI-1742 b has 2.37 times the radius of Earth and about 9.7 times its mass.
How long is a year on TOI-1742 b?
One orbit around TOI-1742 takes 21.3 Earth days — short enough that 17 of its years would fit into one Earth year.
Explore TOI-1742 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.
