TOI-1453 b
TOI-1453 b is a terrestrial planet orbiting TOI-1453 in the constellation Draco. It lies about 257 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-1453 b?
TOI-1453 b has a radius of 1.17 times that of Earth. Its mass is 2.3 times that of Earth, giving it a density of 8.22 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is TOI-1453 b in the Habitable Zone?
The position of TOI-1453 b relative to the habitable zone of TOI-1453 cannot be precisely determined from the available orbital data.
Habitable zone of TOI-1453: 0.419–1.013 AU (conservative: 0.530–0.960 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-1453 b
The equilibrium temperature of TOI-1453 b is about 944 K (671 °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. It receives 133 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-1453 b — one full orbit around TOI-1453 — lasts 4.31 Earth days, shorter than Mercury's 88-day year.
How Was TOI-1453 b Discovered?
TOI-1453 b was discovered in 2025 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-1453 b?
TOI-1453 b is 256.8 light-years (78.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1770. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 4,519,680 years to make the journey.
The Host Star: TOI-1453
TOI-1453 b belongs to a system of 2 stars; it orbits TOI-1453.
TOI-1453
- Surface temperature
- 4,975 K (Sun: 5,772 K)
- Mass
- 0.72 M☉
- Radius
- 0.72 R☉
- Age
- 12.0 billion years (Sun: 4.6)
The TOI-1453 Planetary System
TOI-1453 b is one of 2 known planets in the TOI-1453 system. Its siblings:
- TOI-1453 c (Puffy Planet)
TOI-1453 b — Complete Data
| Radius | 1.173 Earth radii (0.105 Jupiter radii) |
|---|---|
| Mass | 2.32 Earth masses (0.007 Jupiter masses) |
| Density | 8.22 g/cm³ (Earth: 5.51) |
| Orbital period | 4.31 days |
| Equilibrium temperature | 944 K (671 °C) |
| Stellar irradiation | 132.60× Earth |
| Distance from Earth | 256.8 light-years (78.7 parsecs) |
| Constellation | Draco |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-03-18. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1453 b
Is TOI-1453 b habitable?
TOI-1453 b is not known to orbit within the habitable zone of TOI-1453, and as a terrestrial planet it is an unlikely candidate for life as we know it.
How far away is TOI-1453 b?
TOI-1453 b is about 257 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 4,519,680 years to get there.
How big is TOI-1453 b compared to Earth?
TOI-1453 b has 1.17 times the radius of Earth and about 2.3 times its mass.
How long is a year on TOI-1453 b?
One orbit around TOI-1453 takes 4.3 Earth days — short enough that 85 of its years would fit into one Earth year.
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