TIC 393818343 b
TIC 393818343 b is a cold gas giant orbiting TIC 393818343 in the constellation Delphinus. It lies about 306 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TIC 393818343 b?
TIC 393818343 b has a radius of 12.18 times that of Earth, or 1.09 times the radius of Jupiter. Its mass is 1,379 times that of Earth, giving it a density of 4.22 g/cm³ — between that of rocky and gaseous planets.
Is TIC 393818343 b in the Habitable Zone?
TIC 393818343 b orbits inside the inner edge of the habitable zone of TIC 393818343. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TIC 393818343: 0.812–1.914 AU (conservative: 1.029–1.815 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TIC 393818343 b
The equilibrium temperature of TIC 393818343 b is about 806 K (532 °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 2.28 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TIC 393818343 b — one full orbit around TIC 393818343 — lasts 16.2 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.129 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.61), swinging dramatically closer to and farther from its star.
How Was TIC 393818343 b Discovered?
TIC 393818343 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 TIC 393818343 b?
TIC 393818343 b is 305.7 light-years (93.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1721. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 5,380,320 years to make the journey.
The Host Star: TIC 393818343
TIC 393818343 b belongs to a system of 2 stars; it orbits TIC 393818343.
TIC 393818343
- Surface temperature
- 5,756 K (Sun: 5,772 K)
- Mass
- 1.08 M☉
- Radius
- 1.09 R☉
- Luminosity
- 1.1680 L☉
- Age
- 3.8 billion years (Sun: 4.6)
Planetary System
TIC 393818343 b is the only planet known to orbit TIC 393818343 so far.
TIC 393818343 b — Complete Data
| Radius | 12.184 Earth radii (1.087 Jupiter radii) |
|---|---|
| Mass | 1,379.38 Earth masses (4.340 Jupiter masses) |
| Density | 4.22 g/cm³ (Earth: 5.51) |
| Orbital period | 16.25 days |
| Orbital distance | 0.129 AU |
| Eccentricity | 0.606 |
| Equilibrium temperature | 806 K (532 °C) |
| Stellar irradiation | 2.28× Earth |
| Distance from Earth | 305.7 light-years (93.7 parsecs) |
| Constellation | Delphinus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-06-09. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TIC 393818343 b
Is TIC 393818343 b habitable?
No — TIC 393818343 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TIC 393818343 b?
TIC 393818343 b is about 306 light-years from Earth in the constellation Delphinus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 5,380,320 years to get there.
How big is TIC 393818343 b compared to Earth?
TIC 393818343 b has 12.18 times the radius of Earth and about 1,379 times its mass.
How long is a year on TIC 393818343 b?
One orbit around TIC 393818343 takes 16.2 Earth days — short enough that 22 of its years would fit into one Earth year.
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