HD 164604 b

HD 164604 b / Caleuche

Discovery
Discovered by	Arriagada et al.
Discovery site	Las Campanas Observatory
Discovery date	January 26, 2010
Detection method	Doppler spectroscopy
Orbital characteristics
Apastron	1.40 AU (209,000,000 km)
Periastron	0.85 AU (127,000,000 km)
Semi-major axis	1.13 ± 0.05 AU (169,000,000 ± 7,500,000 km)
Eccentricity	0.24 ± 0.14
Orbital period (sidereal)	606.4 ± 9.0 d 1.66 y
Average orbital speed	20.3
Inclination	29°±19°[1]
Time of periastron	24552674 ± 80
Argument of periastron	51 ± 23
Semi-amplitude	77 ± 32
Star	HD 164604
Physical characteristics
Mass	14.3±5.5 MJ[1]

HD 164604 b is an extrasolar planet discovered in January 2010 in association with the Magellan Planet Search Program.^[2] It has a minimum mass 2.7 times the mass of Jupiter and an orbital period of 606.4 days. Its star is classified as a K2 V dwarf and is roughly 124 light-years away from Earth.^[3]

HD 164604 b is named Caleuche. The name was selected in the NameExoWorlds campaign by Chile, during the 100th anniversary of the IAU. Caleuche is a large ghost ship from southern Chilean mythology which sails the seas around the island of Chiloé at night.^[4][5]

An astrometric measurement of the planet's inclination and true mass was published in 2022 as part of Gaia DR3.^[1]

See also

• HD 129445 b
• HD 152079 b
• HD 175167 b
• HD 86226 b

References

1. Gaia Collaboration; et al. (2022). "Gaia Data Release 3: Stellar multiplicity, a teaser for the hidden treasure". arXiv:2206.05595 [astro-ph.SR].
2. Arriagada; et al. (2010). "Five Long-period Extrasolar Planets in Eccentric orbits from the Magellan Planet Search Program". The Astrophysical Journal. 711 (2): 1229. arXiv:1001.4093. Bibcode:2010ApJ...711.1229A. doi:10.1088/0004-637X/711/2/1229. S2CID 118682009.
3. "HD 164604". Extrasolar Planets Encyclopaedia. Retrieved 28 June 2013.
4. "Approved names". NameExoworlds. Retrieved 2020-01-02.
5. "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.