TIC 139270665 b
TIC 139270665 b is a cold gas giant orbiting the G2 star TIC 139270665 in the constellation Lynx. It lies about 619 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TIC 139270665 b?
TIC 139270665 b has a radius of 7.23 times that of Earth, or 0.65 times the radius of Jupiter. Its mass is 147 times that of Earth, giving it a density of 2.13 g/cm³ — between that of rocky and gaseous planets.
Is TIC 139270665 b in the Habitable Zone?
TIC 139270665 b orbits inside the inner edge of the habitable zone of TIC 139270665. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TIC 139270665: 0.776–1.824 AU (conservative: 0.983–1.730 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TIC 139270665 b
The equilibrium temperature of TIC 139270665 b is about 703 K (430 °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 40.30 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TIC 139270665 b — one full orbit around TIC 139270665 — lasts 23.6 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.163 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.11).
How Was TIC 139270665 b Discovered?
TIC 139270665 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 139270665 b?
TIC 139270665 b is 619.3 light-years (189.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1407. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 10,899,680 years to make the journey.
The Host Star: TIC 139270665
TIC 139270665
- Spectral type
- G2
- Surface temperature
- 5,844 K (Sun: 5,772 K)
- Mass
- 1.03 M☉
- Radius
- 1.02 R☉
- Luminosity
- 1.0770 L☉
- Age
- 3.4 billion years (Sun: 4.6)
The TIC 139270665 Planetary System
TIC 139270665 b is one of 2 known planets in the TIC 139270665 system. Its siblings:
- TIC 139270665 c (Cold Gas Giant)
TIC 139270665 b — Complete Data
| Radius | 7.230 Earth radii (0.645 Jupiter radii) |
|---|---|
| Mass | 147.15 Earth masses (0.463 Jupiter masses) |
| Density | 2.13 g/cm³ (Earth: 5.51) |
| Orbital period | 23.62 days |
| Orbital distance | 0.163 AU |
| Eccentricity | 0.105 |
| Equilibrium temperature | 703 K (430 °C) |
| Stellar irradiation | 40.30× Earth |
| Distance from Earth | 619.3 light-years (189.9 parsecs) |
| Constellation | Lynx |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-05-08. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TIC 139270665 b
Is TIC 139270665 b habitable?
No — TIC 139270665 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TIC 139270665 b?
TIC 139270665 b is about 619 light-years from Earth in the constellation Lynx. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 10,899,680 years to get there.
How big is TIC 139270665 b compared to Earth?
TIC 139270665 b has 7.23 times the radius of Earth and about 147 times its mass.
How long is a year on TIC 139270665 b?
One orbit around TIC 139270665 takes 23.6 Earth days — short enough that 15 of its years would fit into one Earth year.
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