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HD 23079 b / Guarani

Discovery
Discovered by	Tinney et al.
Discovery site	Anglo-Australian Observatory
Discovery date	October 2001
Detection method	doppler spectroscopy
Orbital characteristics
Semi-major axis	1.60 ± 0.12 AU (239,000,000 ± 18,000,000 km)
Eccentricity	0.102 ± 0.031
Orbital period (sidereal)	730.6 ± 5.7 d 2.000 y
Time of periastron	2,450,492 ± 37
Argument of periastron	55 ± 17
Semi-amplitude	54.9 ± 1.1
Star	HD 23079

HD 23079 b, formally named Guarani, is an exoplanet approximately 109 light years away in the constellation Reticulum. The planet has mass of at least 2.45 Jupiters, although only the minimum mass is known since inclination is unknown. The planet takes almost exactly two years to orbit the star at the average distance of 1.6 AU. The planet's orbital eccentricity is about the same as 109 Piscium b, HD 75898 b, and HD 69830 b at 0.102. The distance range from as close as 1.44 AU to as far away as 1.76 AU from the parent star.

The planet was discovered in 2001 by Tinney et al., who used doppler spectrometer to look for shifts of star's spectrum caused by a gravity of the planet tug the star around as the planet orbits.

The planet HD 23079 b is named Guarani. The name was selected in the NameExoWorlds campaign by Brazil, during the 100th anniversary of the IAU. The planet is named after the Guarani people. HD 63765 and the planet HD 63765 b have names associated with Guarani cosmovision, selected by Bolivia.

References

1. "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
2. "Approved names". NameExoworlds. Retrieved 2020-01-02.

• Dvorak, R.; Pilat-Lohinger, E.; Schwarz, R.; Freistetter, F. (2004). "Extrasolar Trojan planets close to habitable zones". Astronomy & Astrophysics. 426 (2): L37. arXiv:astro-ph/0408079. Bibcode:2004A&A...426L..37D. doi:10.1051/0004-6361:200400075. S2CID 15637771.

External links

• "Notes for planet HD 23079 b". Extrasolar Planets Encyclopaedia.

v t e Constellation of Reticulum
List of stars in Reticulum Reticulum in Chinese astronomy
Stars	Bayer α β γ δ ε ζ ζ η θ ι κ Variable R YZ HR 1475 HD 21693 21749 23079 (Tupi) 23127 25171 27894 Other 2MASS J03480772−6022270 WISE 0350−5658 WISE 0359−5401
Exoplanets ε Reticuli b HD 23079 b HD 23127 b HD 27894 b
Galaxies	NGC 1313 1559
Astronomical events SN 1997D SN 2005df
Category

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