TOI-1776 b
TOI-1776 b is a terrestrial planet orbiting TOI-1776 in the constellation Ursa Major. It lies about 146 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-1776 b?
TOI-1776 b has a radius of 1.22 times that of Earth. Its mass is 1.4 times that of Earth, giving it a density of 4.13 g/cm³ — between that of rocky and gaseous planets.
Is TOI-1776 b in the Habitable Zone?
TOI-1776 b orbits inside the inner edge of the habitable zone of TOI-1776. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1776: 0.706–1.662 AU (conservative: 0.894–1.576 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-1776 b
The equilibrium temperature of TOI-1776 b is about 1,269 K (996 °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-1776 b — one full orbit around TOI-1776 — lasts 2.80 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.038 AU — closer to its star than Mercury is to the Sun.
How Was TOI-1776 b Discovered?
TOI-1776 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-1776 b?
TOI-1776 b is 145.6 light-years (44.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1881. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,562,560 years to make the journey.
The Host Star: TOI-1776
TOI-1776
- Surface temperature
- 5,785 K (Sun: 5,772 K)
- Mass
- 0.92 M☉
- Radius
- 0.94 R☉
- Luminosity
- 0.8850 L☉
- Age
- 5.1 billion years (Sun: 4.6)
Planetary System
TOI-1776 b is the only planet known to orbit TOI-1776 so far.
TOI-1776 b — Complete Data
| Radius | 1.216 Earth radii (0.108 Jupiter radii) |
|---|---|
| Mass | 1.40 Earth masses (0.004 Jupiter masses) |
| Density | 4.13 g/cm³ (Earth: 5.51) |
| Orbital period | 2.80 days |
| Orbital distance | 0.038 AU |
| Equilibrium temperature | 1,269 K (996 °C) |
| Distance from Earth | 145.6 light-years (44.6 parsecs) |
| Constellation | Ursa Major |
| 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-1776 b
Is TOI-1776 b habitable?
No — TOI-1776 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1776 b?
TOI-1776 b is about 146 light-years from Earth in the constellation Ursa Major. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,562,560 years to get there.
How big is TOI-1776 b compared to Earth?
TOI-1776 b has 1.22 times the radius of Earth and about 1.4 times its mass.
How long is a year on TOI-1776 b?
One orbit around TOI-1776 takes 2.8 Earth days — short enough that 130 of its years would fit into one Earth year.
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