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Kappa Andromedae b: A Super-Jupiter Was Discovered By Astronomers Around Massive Star

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Kappa Andromedae b: A Super-Jupiter Was Discovered By Astronomers Around Massive Star

An international team of astrophysicists has identified a planet thats 13 times bigger than “our” Jupiter, the largest planet in our solar system. If Jupiter has a diameter of 11 times bigger than Earth’s diameter and two and a half times the mass of all the other planets in the Solar System combined, we can try to imagine the size of the newly discovered planet – a “super-Jupiter” orbiting the massive star Kappa Andromedae.

This planet – called Kappa Andromedae b – has a mass at least 13 times that of Jupiter and an orbit somehow larger than Neptune.

The Star around which it orbits is enormous, having a mass of 2.5 times that of the Sun. From of all the known stars, it is the most massive star to ever host a directly observed planet. It’s so big that it can be seen with the naked eye in the constellation Andromeda, 170 light-years away from Earth.

  The astronomers found the planet based on an infrared imaging taken with the Subaru telescope located in Hawaii, as part of the Strategic Explorations of Exoplanets and Disks.


The planet was discovered by the Japanese’ Subaru Telescope, located in Hawaii. Kappa And b is orbiting the star Alpha Andromedae whose age is about 30 million years (about 0.7% of the age of “our” Sun). The star belongs to the spectral type B9, is located in the constellation Andromeda and lies about 170 light-years far from Earth. The star is visible to the naked eye on Earth.

  Physical Properties

The planet is a hot Jupiters, it’s mass is nearly 13 times that of the Jupiter. The object’s distance from its parent star is about 1.8 times Neptune’s distance from the Sun, the temperature is about 1400° C, if seen up close, would appear reddish in color. Depending on the standard model of planet formation, Kappa Andromedae b’s mass is very close to the weight-limit, Oscillating between planet and brown dwarf. So the question is: Planet or brown dwarf?

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