# HD 117618

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Star in the Centaurus constellation

HD 117618 / Dofida Observation data Epoch J2000 Equinox J2000 Constellation Centaurus[1] Right ascension 13h 32m 25.55562s[2] Declination −47° 16′ 16.9132″[2] Apparent magnitude (V) 7.17[1] Characteristics Evolutionary stage main sequence[2] Spectral type G0 V[3] B−V color index 0.603±0.010[1] Astrometry Radial velocity (Rv) +1.60±0.76[1] km/s Proper motion (μ) RA: +25.214[2] mas/yr Dec.: −125.428[2] mas/yr Parallax (π) 26.5429±0.0214 mas[2] Distance 122.88 ± 0.10 ly (37.67 ± 0.03 pc) Absolute magnitude (MV) 4.27[1] Details[4] Mass 1.10±0.02 M☉ Radius 1.17±0.04 R☉ Luminosity 1.6±0.1 L☉ Surface gravity (log g) 4.34±0.03 cgs Temperature 6,019±50 K Metallicity [Fe/H] +0.03±0.01[5] dex Rotational velocity (v sin i) 3.67[6] km/s Age 4.0±1.3 Gyr Other designations Dofida, CD−46°8708, GC 18290, HD 117618, HIP 66047, SAO 224228[7] Database references SIMBAD data Exoplanet Archive data

**HD 117618**, named **Dofida** by the [IAU](/source/IAU),[8] is a single,[9] yellow-hued [star](/source/Star) in the southern [constellation](/source/Constellation) of [Centaurus](/source/Centaurus). With an [apparent visual magnitude](/source/Apparent_visual_magnitude) of 7.17,[1] it is too faint to be visible to the naked eyes of a typical observer. The distance to this star, as determined from its annual [parallax shift](/source/Stellar_parallax) of 26.54 [mas](/source/Milliarcsecond) as seen from Earth's orbit,[2] is 123 [light years](/source/Light_year). It is moving further away with a heliocentric [radial velocity](/source/Radial_velocity) of around +1.6 km/s.[1]

This star is similar to the [Sun](/source/Sun), being a [G-type main-sequence star](/source/G-type_main-sequence_star) with a [stellar classification](/source/Stellar_classification) of G0 V.[3] It is about 10% more massive and 17% larger than the Sun, with an estimated age of roughly four billion years[4] and a [projected rotational velocity](/source/Projected_rotational_velocity) of 3.67 km/s.[6] The star is radiating 1.6 times the [Sun's luminosity](/source/Sun's_luminosity) from its [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 6,019 K.[4]

## Name

HD 117618, and its planet HD 117618b, were chosen as part of the 2019 [NameExoWorlds](/source/NameExoWorlds) campaign organised by the [International Astronomical Union](/source/International_Astronomical_Union), which assigned each country a star and planet to be named. HD 117618 was assigned to [Indonesia](/source/Indonesia). The winning proposal named the star "Dofida" meaning *our star* in [Nias language](/source/Nias_language), and its planet "Noifasui" 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).[8]

## Planetary system

In 2005, the [Anglo-Australian Planet Search](/source/Anglo-Australian_Planet_Search) program announced the discovery of a low-mass planet in orbit around HD 117618. This object was found through measurements of radial velocity variation, which were larger than those produced by the intrinsic jitter of the host star. The best [Keplerian](/source/Keplerian_orbit) fit to the data gave a [periodicity](/source/Orbital_period) of 25.8 days with an [eccentricity](/source/Orbital_eccentricity) of around 0.37 and a [semimajor axis](/source/Semimajor_axis) of 0.17 [AU](/source/Astronomical_unit). The [lower bound](/source/Lower_bound) on the object's mass was estimated to be 0.16 [*M*J](/source/Jupiter_mass).[10] These values were subsequently refined, as shown in the table below.[11]

The HD 117618 planetary system[11] Companion (in order from star) Mass Semimajor axis (AU) Orbital period (days) Eccentricity Inclination (°) Radius b / Noifasui >0.178 ± 0.021 MJ 0.176 ± 0.010 25.827±0.019 0.42 ± 0.17 — —

## See also

- [HD 117207](/source/HD_117207)

- [List of extrasolar planets](/source/List_of_extrasolar_planets)

## References

1. ^ [***a***](#cite_ref-Anderson2012_1-0) [***b***](#cite_ref-Anderson2012_1-1) [***c***](#cite_ref-Anderson2012_1-2) [***d***](#cite_ref-Anderson2012_1-3) [***e***](#cite_ref-Anderson2012_1-4) [***f***](#cite_ref-Anderson2012_1-5) [***g***](#cite_ref-Anderson2012_1-6) Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". *[Astronomy Letters](/source/Astronomy_Letters)*. **38** (5): 331. [arXiv](/source/ArXiv_(identifier)):[1108.4971](https://arxiv.org/abs/1108.4971). [Bibcode](/source/Bibcode_(identifier)):[2012AstL...38..331A](https://ui.adsabs.harvard.edu/abs/2012AstL...38..331A). [doi](/source/Doi_(identifier)):[10.1134/S1063773712050015](https://doi.org/10.1134%2FS1063773712050015). [XHIP record for this object](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-ref=VIZ681510a8389ecb&-out.src=V%2F137D%2FXHIP&-nav=cat%3AV%2F137D%26tab%3A{V%2F137D%2FXHIP}%26key%3Asource%3DV%2F137D%2FXHIP%26HTTPPRM%3A&-source=V%2F137D%2FXHIP&-out=HIP&HIP=66047&-out=Comp&-out=Gr&-out=RAJ2000&-out=DEJ2000&-out=Dist&-out=X&-out=Y&-out=Z&-out=SpType&-out=Simbad&-out=Hpmag&-out=Lum&-out=Cst) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-dr3_2-0) [***b***](#cite_ref-dr3_2-1) [***c***](#cite_ref-dr3_2-2) [***d***](#cite_ref-dr3_2-3) [***e***](#cite_ref-dr3_2-4) [***f***](#cite_ref-dr3_2-5) [***g***](#cite_ref-dr3_2-6) Vallenari, A.; et al. (Gaia collaboration) (2023). ["*Gaia* Data Release 3. Summary of the content and survey properties"](https://doi.org/10.1051%2F0004-6361%2F202243940). *Astronomy and Astrophysics*. **674**: A1. [arXiv](/source/ArXiv_(identifier)):[2208.00211](https://arxiv.org/abs/2208.00211). [Bibcode](/source/Bibcode_(identifier)):[2023A&A...674A...1G](https://ui.adsabs.harvard.edu/abs/2023A&A...674A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202243940](https://doi.org/10.1051%2F0004-6361%2F202243940). [S2CID](/source/S2CID_(identifier)) [244398875](https://api.semanticscholar.org/CorpusID:244398875). [Gaia DR3 record for this source](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-source=+I%2F355&-from=nav&-nav=cat%3AI%2F355%26tab%3A%7BI%2F355%2Fgaiadr3%7D%26key%3Asource%3D1355%2Fgaiadr3%26HTTPPRM%3A%26-out.add%3D.%26Source%3D%3D%3D6083860761505899904%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-Gray2006_3-0) [***b***](#cite_ref-Gray2006_3-1) Gray, R. O.; et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample". *[The Astronomical Journal](/source/The_Astronomical_Journal)*. **132** (1): 161–170. [arXiv](/source/ArXiv_(identifier)):[astro-ph/0603770](https://arxiv.org/abs/astro-ph/0603770). [Bibcode](/source/Bibcode_(identifier)):[2006AJ....132..161G](https://ui.adsabs.harvard.edu/abs/2006AJ....132..161G). [doi](/source/Doi_(identifier)):[10.1086/504637](https://doi.org/10.1086%2F504637). [S2CID](/source/S2CID_(identifier)) [119476992](https://api.semanticscholar.org/CorpusID:119476992).

1. ^ [***a***](#cite_ref-Bonfanti2016_4-0) [***b***](#cite_ref-Bonfanti2016_4-1) [***c***](#cite_ref-Bonfanti2016_4-2) Bonfanti, A.; Ortolani, S.; Nascimbeni, V. (2016). "Age consistency between exoplanet hosts and field stars". *Astronomy & Astrophysics*. **585**: A5, 14 pp. [arXiv](/source/ArXiv_(identifier)):[1511.01744](https://arxiv.org/abs/1511.01744). [Bibcode](/source/Bibcode_(identifier)):[2016A&A...585A...5B](https://ui.adsabs.harvard.edu/abs/2016A&A...585A...5B). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201527297](https://doi.org/10.1051%2F0004-6361%2F201527297). [S2CID](/source/S2CID_(identifier)) [53971692](https://api.semanticscholar.org/CorpusID:53971692).

1. **[^](#cite_ref-Adibekyan2016_5-0)** Adibekyan, V.; et al. (August 2016). "Abundance trend with condensation temperature for stars with different Galactic birth places". *Astronomy & Astrophysics*. **592**: 12. [arXiv](/source/ArXiv_(identifier)):[1606.04714](https://arxiv.org/abs/1606.04714). [Bibcode](/source/Bibcode_(identifier)):[2016A&A...592A..87A](https://ui.adsabs.harvard.edu/abs/2016A&A...592A..87A). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201628883](https://doi.org/10.1051%2F0004-6361%2F201628883). [S2CID](/source/S2CID_(identifier)) [56256991](https://api.semanticscholar.org/CorpusID:56256991). A87.

1. ^ [***a***](#cite_ref-Delgado_Mena2015_6-0) [***b***](#cite_ref-Delgado_Mena2015_6-1) Delgado Mena, E.; et al. (April 2015). "Li abundances in F stars: planets, rotation, and Galactic evolution". *Astronomy & Astrophysics*. **576**: 24. [arXiv](/source/ArXiv_(identifier)):[1412.4618](https://arxiv.org/abs/1412.4618). [Bibcode](/source/Bibcode_(identifier)):[2015A&A...576A..69D](https://ui.adsabs.harvard.edu/abs/2015A&A...576A..69D). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201425433](https://doi.org/10.1051%2F0004-6361%2F201425433). [S2CID](/source/S2CID_(identifier)) [56051637](https://api.semanticscholar.org/CorpusID:56051637). A69.

1. **[^](#cite_ref-SIMBAD_7-0)** ["HD 114837"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+114837). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2018-07-05.

1. ^ [***a***](#cite_ref-IAU_Approved_8-0) [***b***](#cite_ref-IAU_Approved_8-1) ["Approved names (§ Indonesia)"](https://www.thejakartapost.com/news/2019/12/19/written-in-the-stars-native-nias-names-dofida-noifasui-chosen-for-planetary-system.html). *Name Exo Worlds*. [IAU](/source/IAU). Retrieved 18 January 2020.

1. **[^](#cite_ref-Raghavan2006_9-0)** Raghavan, Deepak; et al. (July 2006), "Two Suns in The Sky: Stellar Multiplicity in Exoplanet Systems", *The Astrophysical Journal*, **646** (1): 523–542, [arXiv](/source/ArXiv_(identifier)):[astro-ph/0603836](https://arxiv.org/abs/astro-ph/0603836), [Bibcode](/source/Bibcode_(identifier)):[2006ApJ...646..523R](https://ui.adsabs.harvard.edu/abs/2006ApJ...646..523R), [doi](/source/Doi_(identifier)):[10.1086/504823](https://doi.org/10.1086%2F504823), [S2CID](/source/S2CID_(identifier)) [5669768](https://api.semanticscholar.org/CorpusID:5669768).

1. **[^](#cite_ref-Tinney2005_10-0)** 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-Butler2006_11-0) [***b***](#cite_ref-Butler2006_11-1) 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). [hdl](/source/Hdl_(identifier)):[2299/1103](https://hdl.handle.net/2299%2F1103). [S2CID](/source/S2CID_(identifier)) [119067572](https://api.semanticscholar.org/CorpusID:119067572).

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](https://en.wikipedia.org/wiki/HD_117618) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/HD_117618?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.