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Diagram showing star positions and boundaries of the constellation and its surroundings Location of Kepler-37 in (circled) |
Kepler-37 is a yellow dwarf, G-type star, 215.2 light years from Earth in the constellation Lyra. It is host to exoplanets Kepler-37b, Kepler-37c and Kepler-37d, which all orbit very close to the star. Kepler-37 has a mass about 80.3 percent of the Sun's and a radius about 77 percent as large. It has a temperature similar to that of the Sun, but a bit cooler at 5,417 Kelvin. It has about half the metallicity of our Sun. With an age of roughly 6 billion years, it is slightly older than the Sun, but is still a main-sequence star.
Planetary system
Kepler-37b is the closest planet to the Kelper-37. At the time of its discovery in February 2013, it was the smallest known exoplanet. At 3865 kilometers in diameter, it is slightly larger than Earth's moon. It orbits Kepler-37 once every 13 Earth days at a distance of about 0.1 astronomical units (AU). It is too small and too close to its star to maintain an atmosphere.
Kepler-37c is around three-quarters of the diameter of Earth and orbits approximately every 21 Earth days at a distance of just under 0.14 AU.
Kepler-37d is about twice the diameter of Earth. It orbits in around 40 Earth days at a distance of nearly 0.21 AU.
References
- Catherine Griffin (February 21, 2013). "Tiniest Planet Yet Discovered by NASA Outside our Solar System". Science News. Retrieved February 21, 2013.
- Nature, & supplementary information,
- "Bad Astronomy",
- NASA,
- JPL
External links
- NASA, Kepler mission, Table of Confirmed Planets
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