# HD 117618 b

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Extrasolar planet in the constellation Centaurus

HD 117618 b / Noifasui Discovery Discovered by C.G. Tinney, Butler, Marcy et al.[1] 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 M🜨)

**HD 117618 b**, named **Noifasui** by the [IAU](/source/IAU),[2] is an [exoplanet](/source/Exoplanet) discovered orbiting the [star](/source/Star) [HD 117618](/source/HD_117618) in September 2004. The planet is a small [gas giant](/source/Gas_giant) with perhaps as little as a fifth the [mass](/source/Mass) of [Jupiter](/source/Jupiter). It orbits close to its star in a very [eccentric](/source/Eccentricity_(orbit)) 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](/source/IAU), chosen by Indonesian representatives for the [NameExoWorlds](/source/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

1. ^ [***a***](#cite_ref-Tinney2005_1-0) [***b***](#cite_ref-Tinney2005_1-1) Tinney, C. G.; et al. (2005). "Three Low-Mass Planets from the Anglo-Australian Planet Search". *The Astrophysical Journal*. **623** (2): 1171–1179. [Bibcode](/source/Bibcode_(identifier)):[2005ApJ...623.1171T](https://ui.adsabs.harvard.edu/abs/2005ApJ...623.1171T). [CiteSeerX](/source/CiteSeerX_(identifier)) [10.1.1.491.2941](https://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.491.2941). [doi](/source/Doi_(identifier)):[10.1086/428661](https://doi.org/10.1086%2F428661). [S2CID](/source/S2CID_(identifier)) [12515735](https://api.semanticscholar.org/CorpusID:12515735).

1. ^ [***a***](#cite_ref-IAU_Approved_2-0) [***b***](#cite_ref-IAU_Approved_2-1) ["Approved names (§ Indonesia)"](http://www.nameexoworlds.iau.org/final-results). *Name Exo Worlds*. [IAU](/source/IAU). Retrieved 18 January 2020.

1. **[^](#cite_ref-Butler2006_3-0)** Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". *The Astrophysical Journal*. **646** (1): 505–522. [arXiv](/source/ArXiv_(identifier)):[astro-ph/0607493](https://arxiv.org/abs/astro-ph/0607493). [Bibcode](/source/Bibcode_(identifier)):[2006ApJ...646..505B](https://ui.adsabs.harvard.edu/abs/2006ApJ...646..505B). [doi](/source/Doi_(identifier)):[10.1086/504701](https://doi.org/10.1086%2F504701). [S2CID](/source/S2CID_(identifier)) [119067572](https://api.semanticscholar.org/CorpusID:119067572).

## External links

- ["HD 117618"](https://web.archive.org/web/20120219234757/http://media4.obspm.fr/exoplanets/base/etoile.php?nom=HD+117618). *Exoplanets*. Archived from [the original](http://media4.obspm.fr/exoplanets/base/etoile.php?nom=HD+117618) on 2012-02-19. Retrieved 2008-10-31.

- [California & Carnegie Planet Search](http://exoplanets.org) [entry](http://exoplanets.org/detail/HD_117618_b)

v t e Constellation of Centaurus List of stars in Centaurus Centaurus in Chinese astronomy Stars Bayer α A (Rigil Kentaurus) B (Toliman) C (Proxima Centauri) β (Hadar) γ δ ε ζ (Leepwal) η θ (Menkent) ι (Kulou) κ λ μ ν (Heng) ξ1 ξ2 ο1 ο2 π ρ σ τ υ1 υ2 φ χ ψ x1 x2 C3 D E F G H J K M N Q Flamsteed 1 (i) 2 (g) 3 (k) 4 (h) Variable R T V Y RR SV SX BV DY UY V346 V553 V744 V752 V761 (a) V763 (C1) V766 V779 (Krzemiński's star) V803 V810 V816 (Przybylski's Star) V831 V842 V885 V886 V863 V1032 V1369 V1400 V1935 HR 4460 (A) 4466 (C2) 4499 4522 4523 4537 (j) 4546 (B) 4721 4748 (u) 4796 4817 (l) 4831 (w) 4874 (p) 4888 (e) 4889 (n) 4940 (f) 4979 4989 5006 (r) 5041 (m) 5089 (d) 5174 (z) 5222 (y) 5224 5241 5297 5358 (v) 5371 5471 (b) 5485 (c1) 5489 (c2) HD 97413 98176 100453 101581 101930 102117 (Uklun) 103197 107914 108236 109749 110113 113538 113766 114386 114729 115600 116434 (Matza) 117207 117618 (Dofida) 117939 120411 121228 121504 124448 (Popper's Star) 125072 125595 131399 Other 2MASS J1126−5003 2M1207 Gaia BH2 HD 131399 Ab PSR B1259−63 PSR J1311−3430 TOI-763 WASP-15 (Nyamien) WASP-41 WASP-42 WASP-167/KELT-13 Exoplanets 2M1207b b Centauri b HD 101930 b HD 102117 b (Leklsullun) HD 103197 b HD 109749 b HD 113538 b c HD 114386 b HD 114729 b HD 117207 b HD 117618 b (Noifasui) HD 121504 b HIP 65426 b (Najsakopajk) HIP 67522 b NGTS-13b Proxima Centauri b c d WASP-15b (Asye) Star clusters NGC 3766 4230 4507 5281 5286 5316 5460 5617 5662 Other IC 2944 ω Centauri Scorpius–Centaurus association Stock 16 Nebulae NGC 3918 5307 Other Boomerang Nebula Fleming 1 G292.0+1.8 G306.3-0.9 Gum 41 IC 2944 IRAS 13208−6020 RCW 79 RCW 86 Southern Crab Nebula SuWt 2 Galaxies NGC 3557 3568 3749 3783 4444 4603 4622 4650A 4683 4696 4706 4709 4729 4730 4743 4744 4909 4930 4945 4976 5011 A 5026 5064 5082 5090 5091 5102 5114 5121 5128 (Centaurus A) 5161 5206 5253 5266 5291 5398 5408 5419 5483 5516 Other ESO 269-57 ESO 325-4 ESO 383-76 ESO 444-46 Fourcade-Figueroa Object IC 3370 IC 4214 IC 4329A IRAS 13224−3809 J1144−4308 LEDA 677373 PKS 1144−379 PKS 1353−341 PKS 1424−418 Galaxy clusters Abell S740 Centaurus Cluster Shapley Supercluster Astronomical events GW190521 SN 185 SN 1895B (Z) SN 1972E SN 1986G J1407b SN 2019so Category

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Adapted from the Wikipedia article [HD 117618 b](https://en.wikipedia.org/wiki/HD_117618_b) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/HD_117618_b?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.