KELT-2 A b
KELT-2 A b is a hot Jupiter orbiting KELT-2 A in the constellation Auriga. It lies about 437 light-years from Earth and was discovered in 2012 using the transit method.
How Big Is KELT-2 A b?
KELT-2 A b has a radius of 15.13 times that of Earth, or 1.35 times the radius of Jupiter. Its mass is 540 times that of Earth.
Is KELT-2 A b in the Habitable Zone?
The position of KELT-2 A b relative to the habitable zone of KELT-2 A cannot be precisely determined from the available orbital data.
Habitable zone of KELT-2 A: 1.680–3.910 AU (conservative: 2.128–3.707 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 KELT-2 A b — one full orbit around KELT-2 A — lasts 4.11 Earth days, shorter than Mercury's 88-day year.
How Was KELT-2 A b Discovered?
KELT-2 A b was discovered in 2012 using the transit method, with observations from KELT.
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 KELT-2 A b?
KELT-2 A b is 437.2 light-years (134.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1589. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 7,694,720 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. KELT-2 A b scores 0.06, ranking #5,139 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: KELT-2 A
KELT-2 A b belongs to a system of 2 stars; it orbits KELT-2 A.
KELT-2 A
- Surface temperature
- 6,327 K (Sun: 5,772 K)
- Mass
- 1.54 M☉
- Radius
- 1.93 R☉
Planetary System
KELT-2 A b is the only planet known to orbit KELT-2 A so far.
KELT-2 A b — Complete Data
| Radius | 15.132 Earth radii (1.350 Jupiter radii) |
|---|---|
| Mass | 540.31 Earth masses (1.700 Jupiter masses) |
| Orbital period | 4.11 days |
| Earth Similarity Index | 0.06 |
| Distance from Earth | 437.2 light-years (134.1 parsecs) |
| Constellation | Auriga |
| Discovery method | Transit |
| Discovery facility | KELT |
| Discovery year | 2012 |
Data: NASA Exoplanet Archive, last updated 2018-04-25. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About KELT-2 A b
Is KELT-2 A b habitable?
KELT-2 A b is not known to orbit within the habitable zone of KELT-2 A, and as a hot Jupiter it is an unlikely candidate for life as we know it.
How far away is KELT-2 A b?
KELT-2 A b is about 437 light-years from Earth in the constellation Auriga. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 7,694,720 years to get there.
How big is KELT-2 A b compared to Earth?
KELT-2 A b has 15.13 times the radius of Earth and about 540 times its mass.
How long is a year on KELT-2 A b?
One orbit around KELT-2 A takes 4.1 Earth days — short enough that 89 of its years would fit into one Earth year.
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