TrES-4 b
TrES-4 b is a hot Jupiter orbiting TrES-4 in the constellation Hercules. It lies about 1,683 light-years from Earth and was discovered in 2007 using the transit method.
How Big Is TrES-4 b?
TrES-4 b has a radius of 18.05 times that of Earth, or 1.61 times the radius of Jupiter. Its mass is 248 times that of Earth.
Is TrES-4 b in the Habitable Zone?
The position of TrES-4 b relative to the habitable zone of TrES-4 cannot be precisely determined from the available orbital data.
Habitable zone of TrES-4: 1.398–3.262 AU (conservative: 1.771–3.093 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-4 b — one full orbit around TrES-4 — lasts 3.55 Earth days, shorter than Mercury's 88-day year.
How Was TrES-4 b Discovered?
TrES-4 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-4 b?
TrES-4 b is 1,682.9 light-years (516.0 parsecs) from Earth. Light arriving here tonight left the planet about 1,683 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 29,619,040 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-4 b scores 0.05, ranking #5,271 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TrES-4
TrES-4 b belongs to a system of 2 stars; it orbits TrES-4.
TrES-4
- Surface temperature
- 6,200 K (Sun: 5,772 K)
- Mass
- 1.08 M☉
- Radius
- 1.66 R☉
Planetary System
TrES-4 b is the only planet known to orbit TrES-4 so far.
TrES-4 b — Complete Data
| Radius | 18.046 Earth radii (1.610 Jupiter radii) |
|---|---|
| Mass | 247.91 Earth masses (0.780 Jupiter masses) |
| Orbital period | 3.55 days |
| Earth Similarity Index | 0.05 |
| Distance from Earth | 1,682.9 light-years (516.0 parsecs) |
| Constellation | Hercules |
| Discovery method | Transit |
| Discovery facility | TrES |
| Discovery year | 2007 |
Data: NASA Exoplanet Archive, last updated 2018-04-25. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TrES-4 b
Is TrES-4 b habitable?
TrES-4 b is not known to orbit within the habitable zone of TrES-4, and as a hot Jupiter it is an unlikely candidate for life as we know it.
How far away is TrES-4 b?
TrES-4 b is about 1,683 light-years from Earth in the constellation Hercules. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 29,619,040 years to get there.
How big is TrES-4 b compared to Earth?
TrES-4 b has 18.05 times the radius of Earth and about 248 times its mass.
How long is a year on TrES-4 b?
One orbit around TrES-4 takes 3.6 Earth days — short enough that 103 of its years would fit into one Earth year.
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