HAT-P-13 b
HAT-P-13 b is a hot Jupiter orbiting HAT-P-13 in the constellation Ursa Major. It lies about 805 light-years from Earth and was discovered in 2009 using the transit method.
How Big Is HAT-P-13 b?
HAT-P-13 b has a radius of 14.26 times that of Earth, or 1.27 times the radius of Jupiter. Its mass is 270 times that of Earth.
Is HAT-P-13 b in the Habitable Zone?
The position of HAT-P-13 b relative to the habitable zone of HAT-P-13 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HAT-P-13 b — one full orbit around HAT-P-13 — lasts 2.92 Earth days, shorter than Mercury's 88-day year. Its orbit is nearly circular (eccentricity 0.013).
How Was HAT-P-13 b Discovered?
HAT-P-13 b was discovered in 2009 using the transit method, with observations from HATNet.
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 HAT-P-13 b?
HAT-P-13 b is 805.0 light-years (246.8 parsecs) from Earth. Light arriving here tonight left the planet around the year 1221. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 14,168,000 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. HAT-P-13 b scores 0.06, ranking #5,072 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HAT-P-13
HAT-P-13
The HAT-P-13 Planetary System
HAT-P-13 b is one of 2 known planets in the HAT-P-13 system. Its siblings:
HAT-P-13 b — Complete Data
| Radius | 14.258 Earth radii (1.272 Jupiter radii) |
|---|---|
| Mass | 270.46 Earth masses (0.851 Jupiter masses) |
| Orbital period | 2.92 days |
| Eccentricity | 0.013 |
| Earth Similarity Index | 0.06 |
| Distance from Earth | 805.0 light-years (246.8 parsecs) |
| Constellation | Ursa Major |
| Discovery method | Transit |
| Discovery facility | HATNet |
| Discovery year | 2009 |
Data: NASA Exoplanet Archive, last updated 2014-10-15. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HAT-P-13 b
Is HAT-P-13 b habitable?
HAT-P-13 b is not known to orbit within the habitable zone of HAT-P-13, and as a hot Jupiter it is an unlikely candidate for life as we know it.
How far away is HAT-P-13 b?
HAT-P-13 b is about 805 light-years from Earth in the constellation Ursa Major. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 14,168,000 years to get there.
How big is HAT-P-13 b compared to Earth?
HAT-P-13 b has 14.26 times the radius of Earth and about 270 times its mass.
How long is a year on HAT-P-13 b?
One orbit around HAT-P-13 takes 2.9 Earth days — short enough that 125 of its years would fit into one Earth year.
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