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・ Gliese 176 b
・ Gliese 179
・ Gliese 179 b
・ Gliese 180
・ Gliese 205
・ Gliese 208
・ Gliese 22
・ Gliese 221
・ Gliese 229
・ Gliese 229 Ab
・ Gliese 229 B
・ Gliese 251
・ Gliese 268
・ Gliese 282
・ Gliese 299
Gliese 3021 b
・ Gliese 317
・ Gliese 317 b
・ Gliese 318
・ Gliese 3470 b
・ Gliese 3634
・ Gliese 3634 b
・ Gliese 3685 A
・ Gliese 393
・ Gliese 402
・ Gliese 408
・ Gliese 412
・ Gliese 42
・ Gliese 422 b
・ Gliese 433


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Gliese 3021 b : ウィキペディア英語版
Gliese 3021 b


Gliese 3021 b, also known as GJ 3021 b, is an extrasolar planet approximately 57 light-years away, orbiting its bright G-dwarf parent star in the Southern constellation of Hydrus. It was discovered with the Swiss Euler Telescope at the Chilean La Silla Observatory in 2000.〔
As determined by doppler spectroscopy, the jovian planet has an elongated orbit about 0.5 AU from its host star and a minimum mass 3.37 times that of Jupiter. Its orbital period of more than 133 days is much longer than that for typical hot Jupiters.〔
A study published in 2001 suggested that the usual inability to determine the orbital inclination of an extrasolar planet through radial velocity measurement had caused this mass to be severely underestimated. The astrometric orbit gives an orbital inclination of 11.8° and a mass of 16 Jupiter masses, which would make the object a brown dwarf. However later analysis showed that Hipparcos was not sensitive enough to accurately determine astrometric orbits for substellar companions, which means the inclination (and hence the true mass) of the planet are still unknown.
== References ==


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