TOI-1269 b
TOI-1269 b is a mini-Neptune orbiting TOI-1269 in the constellation Draco. It lies about 561 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-1269 b?
TOI-1269 b has a radius of 2.40 times that of Earth. Its mass is 6.4 times that of Earth, giving it a density of 2.53 g/cm³ — between that of rocky and gaseous planets.
Is TOI-1269 b in the Habitable Zone?
TOI-1269 b orbits inside the inner edge of the habitable zone of TOI-1269. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1269: 0.592–1.407 AU (conservative: 0.750–1.334 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-1269 b
The equilibrium temperature of TOI-1269 b is about 1,005 K (732 °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-1269 b — one full orbit around TOI-1269 — lasts 4.25 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.050 AU — closer to its star than Mercury is to the Sun.
How Was TOI-1269 b Discovered?
TOI-1269 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-1269 b?
TOI-1269 b is 561.4 light-years (172.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1465. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 9,880,640 years to make the journey.
The Host Star: TOI-1269
TOI-1269
- Surface temperature
- 5,499 K (Sun: 5,772 K)
- Mass
- 0.90 M☉
- Radius
- 0.85 R☉
- Luminosity
- 0.6030 L☉
- Age
- 3.1 billion years (Sun: 4.6)
The TOI-1269 Planetary System
TOI-1269 b is one of 2 known planets in the TOI-1269 system. Its siblings:
- TOI-1269 c (Mini Neptune)
TOI-1269 b — Complete Data
| Radius | 2.401 Earth radii (0.214 Jupiter radii) |
|---|---|
| Mass | 6.40 Earth masses (0.020 Jupiter masses) |
| Density | 2.53 g/cm³ (Earth: 5.51) |
| Orbital period | 4.25 days |
| Orbital distance | 0.050 AU |
| Equilibrium temperature | 1,005 K (732 °C) |
| Distance from Earth | 561.4 light-years (172.1 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-1269 b
Is TOI-1269 b habitable?
No — TOI-1269 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1269 b?
TOI-1269 b is about 561 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 9,880,640 years to get there.
How big is TOI-1269 b compared to Earth?
TOI-1269 b has 2.40 times the radius of Earth and about 6.4 times its mass.
How long is a year on TOI-1269 b?
One orbit around TOI-1269 takes 4.3 Earth days — short enough that 86 of its years would fit into one Earth year.
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