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