TrES-1 b
TrES-1 b is a hot Jupiter orbiting TrES-1 in the constellation Lyra. It lies about 521 light-years from Earth and was discovered in 2004 using the transit method.
How Big Is TrES-1 b?
TrES-1 b has a radius of 12.67 times that of Earth, or 1.13 times the radius of Jupiter. Its mass is 267 times that of Earth.
Is TrES-1 b in the Habitable Zone?
The position of TrES-1 b relative to the habitable zone of TrES-1 cannot be precisely determined from the available orbital data.
Habitable zone of TrES-1: 0.539–1.292 AU (conservative: 0.683–1.225 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-1 b — one full orbit around TrES-1 — lasts 3.03 Earth days, shorter than Mercury's 88-day year.
How Was TrES-1 b Discovered?
TrES-1 b was discovered in 2004 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-1 b?
TrES-1 b is 520.7 light-years (159.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1506. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 9,164,320 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-1 b scores 0.07, ranking #4,836 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TrES-1
TrES-1 b belongs to a system of 2 stars; it orbits TrES-1.
TrES-1
- Surface temperature
- 5,230 K (Sun: 5,772 K)
- Mass
- 1.04 M☉
- Radius
- 0.85 R☉
Planetary System
TrES-1 b is the only planet known to orbit TrES-1 so far.
TrES-1 b — Complete Data
| Radius | 12.666 Earth radii (1.130 Jupiter radii) |
|---|---|
| Mass | 266.98 Earth masses (0.840 Jupiter masses) |
| Orbital period | 3.03 days |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 520.7 light-years (159.7 parsecs) |
| Constellation | Lyra |
| Discovery method | Transit |
| Discovery facility | TrES |
| Discovery year | 2004 |
Data: NASA Exoplanet Archive, last updated 2018-04-25. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TrES-1 b
Is TrES-1 b habitable?
TrES-1 b is not known to orbit within the habitable zone of TrES-1, and as a hot Jupiter it is an unlikely candidate for life as we know it.
How far away is TrES-1 b?
TrES-1 b is about 521 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 9,164,320 years to get there.
How big is TrES-1 b compared to Earth?
TrES-1 b has 12.67 times the radius of Earth and about 267 times its mass.
How long is a year on TrES-1 b?
One orbit around TrES-1 takes 3.0 Earth days — short enough that 121 of its years would fit into one Earth year.
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