TOI-1294 b
TOI-1294 b is a hot Jupiter orbiting TOI-1294 in the constellation Ursa Minor. It lies about 1,085 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-1294 b?
TOI-1294 b has a radius of 10.12 times that of Earth, or 0.90 times the radius of Jupiter. Its mass is 63.9 times that of Earth, giving it a density of 0.34 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-1294 b in the Habitable Zone?
TOI-1294 b orbits inside the inner edge of the habitable zone of TOI-1294. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1294: 1.151–2.716 AU (conservative: 1.458–2.575 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-1294 b
The equilibrium temperature of TOI-1294 b is about 1,393 K (1,120 °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-1294 b — one full orbit around TOI-1294 — lasts 3.92 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.051 AU — closer to its star than Mercury is to the Sun.
How Was TOI-1294 b Discovered?
TOI-1294 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-1294 b?
TOI-1294 b is 1,085.0 light-years (332.6 parsecs) from Earth. Light arriving here tonight left the planet about 1,085 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 19,096,000 years to make the journey.
The Host Star: TOI-1294
TOI-1294
- Surface temperature
- 5,718 K (Sun: 5,772 K)
- Mass
- 1.16 M☉
- Radius
- 1.56 R☉
- Luminosity
- 2.3360 L☉
- Age
- 6.2 billion years (Sun: 4.6)
The TOI-1294 Planetary System
TOI-1294 b is one of 2 known planets in the TOI-1294 system. Its siblings:
- TOI-1294 c (Cold Gas Giant)
TOI-1294 b — Complete Data
| Radius | 10.124 Earth radii (0.903 Jupiter radii) |
|---|---|
| Mass | 63.90 Earth masses (0.201 Jupiter masses) |
| Density | 0.34 g/cm³ (Earth: 5.51) |
| Orbital period | 3.92 days |
| Orbital distance | 0.051 AU |
| Equilibrium temperature | 1,393 K (1,120 °C) |
| Distance from Earth | 1,085.0 light-years (332.6 parsecs) |
| Constellation | Ursa Minor |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-07-22. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1294 b
Is TOI-1294 b habitable?
No — TOI-1294 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1294 b?
TOI-1294 b is about 1,085 light-years from Earth in the constellation Ursa Minor. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 19,096,000 years to get there.
How big is TOI-1294 b compared to Earth?
TOI-1294 b has 10.12 times the radius of Earth and about 63.9 times its mass.
How long is a year on TOI-1294 b?
One orbit around TOI-1294 takes 3.9 Earth days — short enough that 93 of its years would fit into one Earth year.
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