description GJ 3470 b Overview
GJ 3470 b is a transiting warm sub-Neptune orbiting the M-dwarf GJ 3470, about 96 light-years from Earth. It has a mass of roughly 12.6 Earth masses, a radius about 4.3 times Earth’s, and an orbital period of around 3.3 days. Ultraviolet observations have detected hydrogen and helium escaping from its upper atmosphere, making the planet a useful case for studying atmospheric erosion from a close-in, low-density world.
help GJ 3470 b FAQ
What type of planet is GJ 3470 b?
GJ 3470 b is a transiting warm sub-Neptune with a mass of roughly 12.6 Earth masses and a radius about 4.3 times Earth's. It orbits the M-dwarf star GJ 3470.
How long is the year on GJ 3470 b?
The planet completes an orbit in around 3.3 days. Its close orbit exposes it to strong stellar radiation compared with planets at Earth-like distances.
Why is GJ 3470 b important for atmospheric studies?
Ultraviolet observations have detected hydrogen and helium escaping from its atmosphere. The planet is about 96 light-years away, and its bright host star makes atmospheric follow-up practical.
Is GJ 3470 b a gas giant like Jupiter?
No, it is far smaller than Jupiter and is classified as a warm sub-Neptune. Its roughly 12.6-Earth-mass scale places it between Earth-sized planets and the Solar System's ice giants.
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