TrES-2 b
TrES-2 b is a hot Jupiter orbiting TrES-2 in the constellation Draco. It lies about 702 light-years from Earth and was discovered in 2006 using the transit method.
How Big Is TrES-2 b?
TrES-2 b has a radius of 15.24 times that of Earth, or 1.36 times the radius of Jupiter. Its mass is 474 times that of Earth.
Is TrES-2 b in the Habitable Zone?
The position of TrES-2 b relative to the habitable zone of TrES-2 cannot be precisely determined from the available orbital data.
Habitable zone of TrES-2: 0.858–2.017 AU (conservative: 1.087–1.913 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-2 b — one full orbit around TrES-2 — lasts 2.47 Earth days, shorter than Mercury's 88-day year.
How Was TrES-2 b Discovered?
TrES-2 b was discovered in 2006 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-2 b?
TrES-2 b is 702.3 light-years (215.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1324. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 12,360,480 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-2 b scores 0.06, ranking #5,136 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TrES-2
TrES-2 b belongs to a system of 2 stars; it orbits TrES-2.
TrES-2
- Surface temperature
- 5,850 K (Sun: 5,772 K)
- Mass
- 1.36 M☉
- Radius
- 1.12 R☉
Planetary System
TrES-2 b is the only planet known to orbit TrES-2 so far.
TrES-2 b — Complete Data
| Radius | 15.244 Earth radii (1.360 Jupiter radii) |
|---|---|
| Mass | 473.57 Earth masses (1.490 Jupiter masses) |
| Orbital period | 2.47 days |
| Earth Similarity Index | 0.06 |
| Distance from Earth | 702.3 light-years (215.3 parsecs) |
| Constellation | Draco |
| Discovery method | Transit |
| Discovery facility | TrES |
| Discovery year | 2006 |
Data: NASA Exoplanet Archive, last updated 2018-04-25. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TrES-2 b
Is TrES-2 b habitable?
TrES-2 b is not known to orbit within the habitable zone of TrES-2, and as a hot Jupiter it is an unlikely candidate for life as we know it.
How far away is TrES-2 b?
TrES-2 b is about 702 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 12,360,480 years to get there.
How big is TrES-2 b compared to Earth?
TrES-2 b has 15.24 times the radius of Earth and about 474 times its mass.
How long is a year on TrES-2 b?
One orbit around TrES-2 takes 2.5 Earth days — short enough that 148 of its years would fit into one Earth year.
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