| HD 117618 b / Noifasui | |
| Discoverer: | C.G. Tinney, Butler, Marcy et al. |
| Discovery Site: | Anglo-Australian Observatory |
| Discovered: | 16 September 2004 |
| Discovery Method: | Radial velocity |
| Apsis: | astron |
| Aphelion: | 0.25AU |
| Perihelion: | 0.102AU |
| Semimajor: | 0.176± |
| Eccentricity: | 0.42 ± 0.17 |
| Period: | 25.827 ± 0.019 d 0.070709 y |
| Avg Speed: | 74.4 |
| Time Periastron: | 2,450,832.2 ± 1.8 |
| Arg Peri: | 254 ± 19 |
| Semi-Amplitude: | 12.8 ± 2.2 |
| Star: | HD 117618 |
| Mass: | >0.178 ± 0.021 (>56.5) |
HD 117618 b, named Noifasui by the IAU, 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.
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). Its parent star was simultaneously named "Dofida" in the contest.