TrES-3 b
TrES-3 b is a hot Jupiter orbiting TrES-3 in the constellation Hercules. It lies about 755 light-years from Earth and was discovered in 2007 using the transit method.
How Big Is TrES-3 b?
TrES-3 b has a radius of 14.98 times that of Earth, or 1.34 times the radius of Jupiter. Its mass is 607 times that of Earth, giving it a density of 0.99 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TrES-3 b in the Habitable Zone?
TrES-3 b orbits inside the inner edge of the habitable zone of TrES-3. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TrES-3: 0.598–1.413 AU (conservative: 0.757–1.340 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Orbit and Year Length
A year on TrES-3 b — one full orbit around TrES-3 — lasts just 31.3 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.023 AU — closer to its star than Mercury is to the Sun.
How Was TrES-3 b Discovered?
TrES-3 b was discovered in 2007 using the transit method, with observations from TrES.
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 TrES-3 b?
TrES-3 b is 754.5 light-years (231.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1272. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 13,279,200 years to make the journey.
Earth Similarity Index
The Earth Similarity Index (ESI) scores how physically similar a planet is to Earth, from 0 to 1, based on radius, density, escape velocity and surface temperature. TrES-3 b scores 0.06, ranking #5,128 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TrES-3
TrES-3
- Surface temperature
- 5,650 K (Sun: 5,772 K)
- Mass
- 0.93 M☉
- Radius
- 0.83 R☉
- Luminosity
- 0.6250 L☉
- Age
- 0.9 billion years (Sun: 4.6)
Planetary System
TrES-3 b is the only planet known to orbit TrES-3 so far.
TrES-3 b — Complete Data
| Radius | 14.975 Earth radii (1.336 Jupiter radii) |
|---|---|
| Mass | 607.03 Earth masses (1.910 Jupiter masses) |
| Density | 0.99 g/cm³ (Earth: 5.51) |
| Orbital period | 1.31 days |
| Orbital distance | 0.023 AU |
| Earth Similarity Index | 0.06 |
| Distance from Earth | 754.5 light-years (231.3 parsecs) |
| Constellation | Hercules |
| Discovery method | Transit |
| Discovery facility | TrES |
| Discovery year | 2007 |
Data: NASA Exoplanet Archive, last updated 2022-10-31. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TrES-3 b
Is TrES-3 b habitable?
No — TrES-3 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TrES-3 b?
TrES-3 b is about 755 light-years from Earth in the constellation Hercules. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 13,279,200 years to get there.
How big is TrES-3 b compared to Earth?
TrES-3 b has 14.98 times the radius of Earth and about 607 times its mass.
How long is a year on TrES-3 b?
One orbit around TrES-3 takes 1.3 Earth days — short enough that 280 of its years would fit into one Earth year.
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