GJ 3021 b

Planetbox begin
name = GJ 3021 bPlanetbox star
star = GJ 3021
constell = Hydrus
ra = RA|00|16|12.6775
dec = DEC|-79|51|04.254
dist_ly = 57.47
dist_pc = 17.62
class = G6VPlanetbox orbit
semimajor = 0.495cite web|url=http://exoplanets.org/planets.shtml|title=Catalog of Nearby Exoplanets|year=2007|author=Butler, R. P. et al.|accessdate=2007-07-28]
eccentricity = 0.511 ± 0.017
period = 133.71 ± 0.20
ang_dist = 27.809
long_peri = 290.7 ± 3.0
t_peri = 2,451,545.86 ± 0.64
semi-amp = 167.0 ± 4.0Planetbox character
mass = >3.37
radius = ~1.091
temperature = ~310Planetbox discovery
discovery_date = 25 January 2000
discoverers = Naef "et al."
discovery_method = Radial velocity
discovery_site = flag|France
discovery_status = Published

GJ 3021 b, formally cataloged as Gliese 3021 b, is an extrasolar planet [cite journal | url=http://www.aanda.org/articles/aa/full/2001/31/aa10239/aa10239.html | author=Naef "et al." | title=The CORALIE survey for southern extrasolar planets V. 3 new extrasolar planets | journal = Astronomy and Astrophysics | year=2001 | volume=375 | issue=1 | pages=205–218 | doi=10.1051/0004-6361:20010841 ] approximately 57 light-years away in the constellation of Hydrus The planet is classified as as Jovian planet orbiting about 0.5 AU from its star with a minimum mass 3.37 times that of Jupiter, as determined by measuring variations in the radial velocity of the star. 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. [ cite journal | url=http://www.journals.uchicago.edu/doi/full/10.1086/318927 | author=Han "et al." | title=Preliminary astrometric masses for proposed extrasolar planetary companions | journal=The Astrophysical Journal | volume=548| issue=1 | pages=L57 – L60 | year=2001 | doi=10.1086/318927 ] 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. [cite journal | url=http://www.aanda.org/articles/aa/full/2001/24/aa1274/aa1274.html | title=Screening the Hipparcos-based astrometric orbits of sub-stellar objects | author=Pourbaix, D. and Arenou, F. | journal=Astronomy and Astrophysics | volume=372 | issue=3 | pages=935–944 | year=2001 | doi=10.1051/0004-6361:20010597]

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