GJ 3021 b

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GJ 3021 b
Extrasolar planet List of extrasolar planets
Artist's impression of GJ 3021 b (16997895118).jpg
An artist's impression of GJ 3021 b
Parent star
Star GJ 3021
Constellation Hydrus
Right ascension (α) 00h 16m 12.678s[1]
Declination (δ) −79° 51′ 04.24″[1]
Distance 57.1 ± 0.3[1] ly
(17.50 ± 0.09 [1] pc)
Spectral type G6V
Orbital elements
Semimajor axis (a) 0.495[2] AU
Eccentricity (e) 0.511 ± 0.017[2]
Orbital period (P) 133.71 ± 0.20[2] d
Argument of
(ω) 290.7 ± 3.0[2]°
Time of periastron (T0) 2,451,545.86 ± 0.64[2] JD
Semi-amplitude (K) 167.0 ± 4.0[2] m/s
Physical characteristics
Minimum mass (m sin i) 3.37[2] MJ
Discovery information
Discovery date 25 January 2000
Discoverer(s) Naef et al.
Discovery method Radial velocity
Discovery site  France
Discovery status Published

GJ 3021 b is an extrasolar planet[3] approximately 57 light-years away in the constellation of Hydrus. The planet is a Jupiter-like 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.[4] 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.[5]


External links[edit]

Coordinates: Sky map 00h 16m 12.6775s, −79° 51′ 04.254″