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GJ 3021 b

GJ 3021 b
Discovery
Discovered by	Naef, Mayor, Queloz
Discovery site	EULER, La Silla, Chile
Discovery date	25 January 2000
Detection method	Radial velocity
Orbital characteristics
Semi-major axis	0.495 AU (74,100,000 km)
Eccentricity	0.511 ± 0.017
Orbital period (sidereal)	133.71 ± 0.20 d
Time of periastron	2,451,545.86 ± 0.64
Argument of periastron	290.7 ± 3.0
Semi-amplitude	167.0 ± 4.0
Star	GJ 3021

GJ 3021 b, also known as Gliese 3021 b or HD 1237 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

1. ^ Butler, R. P.; et al. (2007). "Catalog of Nearby Exoplanets". Retrieved 2007-07-28.
2. ^ Naef, D.; et al. (2001). "The CORALIE survey for southern extrasolar planets V. 3 new extrasolar planets". Astronomy and Astrophysics. 375 (1): 205–218. arXiv:astro-ph/0106255. Bibcode:2001A&A...375..205N. doi:10.1051/0004-6361:20010841. S2CID 16606841.
3. Han; et al. (2001). "Preliminary astrometric masses for proposed extrasolar planetary companions". The Astrophysical Journal Letters. 548 (1): L57 – L60. Bibcode:2001ApJ...548L..57H. doi:10.1086/318927.
4. Pourbaix, D.; Arenou, F. (2001). "Screening the Hipparcos-based astrometric orbits of sub-stellar objects". Astronomy and Astrophysics. 372 (3): 935–944. arXiv:astro-ph/0104412. Bibcode:2001A&A...372..935P. doi:10.1051/0004-6361:20010597. S2CID 378792.

External links

• "GJ 3021 / HD 1237 / CD-80 9". SolStation. Retrieved 2008-06-24.
• "Notes for star GJ 3021 b". Extrasolar Planets Encyclopaedia. Retrieved 2008-06-24.

v t e Constellation of Hydrus
List of stars in Hydrus Hydrus in Chinese astronomy
Stars	Bayer α β γ δ ε ζ η η θ ι κ λ μ ν π π σ τ τ Variable VW HD 1237 10180 20003 Other AB8 SMSS J0313−6708 WISEPC J014807.25−720258.7
Exoplanets η Hydri b GJ 3021 b HD 10180 c
Star clusters NGC 602 NGC 643 NGC 1466
Galaxies	NGC 646 802 813 Other KKs 3 PGC 6240 Small Magellanic Cloud (mostly in Tucana) Large Magellanic Cloud (mostly in Dorado, partly in Mensa)
Category

• Giant planets
• Hydrus
• Exoplanets discovered in 2000
• Exoplanets detected by radial velocity
• Exoplanets in the Gliese Catalog
• Gliese and GJ objects