TIC 434398831 b
TIC 434398831 b is a sub-Neptune orbiting the G4 V star TIC 434398831 in the constellation Orion. It lies about 708 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TIC 434398831 b?
TIC 434398831 b has a radius of 3.51 times that of Earth.
Is TIC 434398831 b in the Habitable Zone?
TIC 434398831 b orbits inside the inner edge of the habitable zone of TIC 434398831. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TIC 434398831: 0.655–1.549 AU (conservative: 0.830–1.469 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TIC 434398831 b
The equilibrium temperature of TIC 434398831 b is about 1,250 K (977 °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 TIC 434398831 b — one full orbit around TIC 434398831 — lasts 3.69 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.046 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.040).
How Was TIC 434398831 b Discovered?
TIC 434398831 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 TIC 434398831 b?
TIC 434398831 b is 707.8 light-years (217.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1319. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 12,457,280 years to make the journey.
The Host Star: TIC 434398831
TIC 434398831
- Spectral type
- G4 V
- Surface temperature
- 5,638 K (Sun: 5,772 K)
- Mass
- 0.99 M☉
- Radius
- 0.91 R☉
- Age
- 0.1 billion years (Sun: 4.6)
The TIC 434398831 Planetary System
TIC 434398831 b is one of 2 known planets in the TIC 434398831 system. Its siblings:
- TIC 434398831 c (Neptune-like)
TIC 434398831 b — Complete Data
| Radius | 3.510 Earth radii (0.313 Jupiter radii) |
|---|---|
| Orbital period | 3.69 days |
| Orbital distance | 0.046 AU |
| Eccentricity | 0.040 |
| Equilibrium temperature | 1,250 K (977 °C) |
| Distance from Earth | 707.8 light-years (217.0 parsecs) |
| Constellation | Orion |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-06-02. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TIC 434398831 b
Is TIC 434398831 b habitable?
No — TIC 434398831 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TIC 434398831 b?
TIC 434398831 b is about 708 light-years from Earth in the constellation Orion. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 12,457,280 years to get there.
How big is TIC 434398831 b compared to Earth?
TIC 434398831 b has 3.51 times the radius of Earth.
How long is a year on TIC 434398831 b?
One orbit around TIC 434398831 takes 3.7 Earth days — short enough that 99 of its years would fit into one Earth year.
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