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HD 117618 b / Noifasui
Discovery
Discovered by	C.G. Tinney, Butler,; Marcy et al.
Discovery site	Anglo-Australian Observatory
Discovery date	16 September 2004
Detection method	Radial velocity
Orbital characteristics
Apastron	0.250 AU (37,400,000 km)
Periastron	0.102 AU (15,300,000 km)
Semi-major axis	0.176 ± 0.010 AU (26,300,000 ± 1,500,000 km)
Eccentricity	0.42 ± 0.17
Orbital period (sidereal)	25.827 ± 0.019 d; 0.070709 y
Average orbital speed	74.4
Time of periastron	2,450,832.2 ± 1.8
Argument of periastron	254 ± 19
Semi-amplitude	12.8 ± 2.2
Star	HD 117618
Physical characteristics
Mass	>0.178 ± 0.021 MJ; (>56.5 ME)

HD 117618 b, named Noifasui by the IAU,^[2] is an exoplanet discovered orbiting the star HD 117618 in September 2004. The planet is a small gas giant less than a fifth the mass of Jupiter. It orbits close to its star in a very eccentric orbit.^[1]^[3]

Name

The planet was originally named "HD 117618 b", being the second object in the HD 117618 system. It was given the name "Noifasui" by the IAU, chosen by Indonesian representatives for the NameExoWorlds campaign, meaning revolve around in Nias language (derived from the word ifasui, meaning to revolve around, and no, indicating that the action occurred in the past and continued to the present time).^[2] Its parent star was simultaneously named "Dofida" in the contest.

References

^ ^a ^b Tinney, C. G.; et al. (2005). "Three Low-Mass Planets from the Anglo-Australian Planet Search". The Astrophysical Journal. 623 (2): 1171–1179. Bibcode:2005ApJ...623.1171T. CiteSeerX 10.1.1.491.2941. doi:10.1086/428661. S2CID 12515735.
^ ^a ^b "Approved names (§ Indonesia)". Name Exo Worlds. IAU. Retrieved 18 January 2020.
^ Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv:astro-ph/0607493. Bibcode:2006ApJ...646..505B. doi:10.1086/504701. S2CID 119067572.