41 Lyncis b

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41 Lyncis b
Exoplanet List of exoplanets
Parent star
Star 41 Lyncis
Constellation Ursa Major
Right ascension (α) 09h 28m 40s
Declination (δ) +45° 36′ 05″
Apparent magnitude (mV) 5.41
Distance 287.9 ± 26 ly
(88.26 ± 8 pc)
Spectral type K0III-IV
Orbital elements
Semi-major axis (a) 0.81 AU
(122 Gm)
Eccentricity (e) 0
Orbital period (P) 184.02 ± 0.18 d
(0.50381 y)
Time of periastron (T0) 2,452,335.4 ± 1.1 JD
Physical characteristics
Minimum mass (m sin i) 2.7 MJ
Discovery information
Discovery date February 19, 2008
Discoverer(s) Sato et al.[1]
Discovery method radial velocity
Discovery site Okayama Planet
Search Program

Discovery status Published[1]
Other designations
Arkas, HD 81688 b
Database references
Extrasolar Planets
Exoplanet Archive data
Open Exoplanet Catalogue data

41 Lyncis b (abbreviated 41 Lyn b), also designated HD 81688 b and named Arkas, is an extrasolar planet approximately 249 light years from Earth in the constellation of Ursa Major.

A gas giant with a minimum mass 2.7 times that of Jupiter it orbits the K-type star 41 Lyncis with an orbital period of 184 days (corresponding to semi-major axis of 0.81 AU). It was discovered and announced by Sato on February 19, 2008.[1]

In July 2014 the International Astronomical Union launched a process for giving proper names to certain exoplanets and their host stars.[2] The process involved public nomination and voting for the new names.[3] In December 2015, the IAU announced the name Arkas for this planet.[4] The winning name was submitted by the Okayama Astro Club of Japan. Arkas was the son of Callisto (Ursa Major) in Greek mythology.[5]

See also[edit]


Coordinates: Sky map 09h 28m 40s, +45° 36′ 05″