# HD 113538

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/HD_113538
> Markdown URL: https://mediated.wiki/source/HD_113538.md
> Source: https://en.wikipedia.org/wiki/HD_113538
> Source revision: 1328126737
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

Star in the constellation Centaurus

HD 113538 Observation data Epoch J2000.0 Equinox J2000.0 Constellation Centaurus[1] Right ascension 13h 04m 57.47645s[2] Declination −52° 26′ 34.5284″[2] Apparent magnitude (V) 9.05[1] Characteristics Evolutionary stage main sequence[3] Spectral type K9Vk:[4] B−V color index 1.362±0.009[1] Astrometry Radial velocity (Rv) 39.23±0.012[5] km/s Proper motion (μ) RA: −786.038[2] mas/yr Dec.: −795.591[2] mas/yr Parallax (π) 61.3899±0.0523 mas[2] Distance 53.13 ± 0.05 ly (16.29 ± 0.01 pc) Absolute magnitude (MV) 8.03[5] Details[5] Mass 0.585±0.05 M☉ Radius 0.53±0.02 R☉ Luminosity 0.127[2] L☉ Surface gravity (log g) 3.79±0.53 cgs Temperature 4,462±145 K Metallicity [Fe/H] −0.24±0.06 dex Age 4.3±4.0 Gyr Other designations CD−51 7244, GJ 9425, GJ 496.1, HD 113538, HIP 63833, LFT 966, LHS 344[6] Database references SIMBAD data

**HD 113538** (**Gliese 496.1**) is a star with two planetary companions in the southern [constellation](/source/Constellation) of [Centaurus](/source/Centaurus). It is much too faint to be viewed with the naked eye at an [apparent visual magnitude](/source/Apparent_visual_magnitude) of 9.05.[1] The distance to this star is 53 [light years](/source/Light_year) and it is drifting further away with a [radial velocity](/source/Radial_velocity) of +39 km/s.[5]

This is a [K-type main-sequence star](/source/K-type_main-sequence_star) of a late spectral type, [classified](/source/Stellar_classification) as K9Vk:. It displays [chromospheric activity](/source/Magnetic_activity) with a [stellar cycle](/source/Solar_cycle) of at least four years and is [metal](/source/Metallicity) poor.[5] The star has 58.5% of the mass and 53% of the radius of the [Sun](/source/Sun).[5] It is radiating just 12.7%[2] of the luminosity of the Sun from its [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 4,462 K.[5]

## Planetary system

Radial velocity variation of HD 113538 was inferred from observations with the [HARPS spectrograph](/source/High_Accuracy_Radial_Velocity_Planet_Searcher). The star is active (Log R'HK −4.697,[7] SMW 1.05[5]), but the RV variation is not correlated with activity, indicating that planets are responsible. The data is fitted well by a solution including two planets, with an eccentric Saturn-mass planet and a more massive planet on a longer-period orbit[8]—similar to the orbital architecture of the planetary system orbiting [HD 163607](https://en.wikipedia.org/w/index.php?title=HD_163607&action=edit&redlink=1), though with lower masses. Similar to HD 163607 b, the eccentricity and argument of periastron of HD 113538 b increases the planet's transit probability substantially more than it would be on a circular orbit.

The HD 113538 planetary system[5] Companion (in order from star) Mass Semimajor axis (AU) Orbital period (days) Eccentricity Inclination (°) Radius b ≥ 0.36±0.04 MJ 1.24±0.04 663.2+8.4 −7.4 0.14±0.08 — — c ≥ 0.93±0.06 MJ 2.44±0.07 1,818+25 −22 0.20±0.04 — —

## References

1. ^ [***a***](#cite_ref-Anderson_Francis_2012_1-0) [***b***](#cite_ref-Anderson_Francis_2012_1-1) [***c***](#cite_ref-Anderson_Francis_2012_1-2) [***d***](#cite_ref-Anderson_Francis_2012_1-3) 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=63833&-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-GaiaDR2_2-0) [***b***](#cite_ref-GaiaDR2_2-1) [***c***](#cite_ref-GaiaDR2_2-2) [***d***](#cite_ref-GaiaDR2_2-3) [***e***](#cite_ref-GaiaDR2_2-4) [***f***](#cite_ref-GaiaDR2_2-5) [***g***](#cite_ref-GaiaDR2_2-6) [Brown, A. G. A.](/source/Anthony_Brown_(scientist)); et al. ([Gaia collaboration](/source/Data_Processing_and_Analysis_Consortium)) (August 2018). ["*Gaia* Data Release 2: Summary of the contents and survey properties"](https://doi.org/10.1051%2F0004-6361%2F201833051). *[Astronomy & Astrophysics](/source/Astronomy_%26_Astrophysics)*. **616**. A1. [arXiv](/source/ArXiv_(identifier)):[1804.09365](https://arxiv.org/abs/1804.09365). [Bibcode](/source/Bibcode_(identifier)):[2018A&A...616A...1G](https://ui.adsabs.harvard.edu/abs/2018A&A...616A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201833051](https://doi.org/10.1051%2F0004-6361%2F201833051). [Gaia DR2 record for this source](https://vizier.u-strasbg.fr/viz-bin/VizieR-S?Gaia%20DR2%206080301367488384896) at [VizieR](/source/VizieR).

1. **[^](#cite_ref-reiners2020_3-0)** Reiners, Ansgar; Zechmeister, Mathias (2020). ["Radial Velocity Photon Limits for the Dwarf Stars of Spectral Classes F-M"](https://doi.org/10.3847%2F1538-4365%2Fab609f). *The Astrophysical Journal Supplement Series*. **247** (1): 11. [arXiv](/source/ArXiv_(identifier)):[1912.04120](https://arxiv.org/abs/1912.04120). [Bibcode](/source/Bibcode_(identifier)):[2020ApJS..247...11R](https://ui.adsabs.harvard.edu/abs/2020ApJS..247...11R). [doi](/source/Doi_(identifier)):[10.3847/1538-4365/ab609f](https://doi.org/10.3847%2F1538-4365%2Fab609f).

1. **[^](#cite_ref-Gray_et_al_2006_4-0)** 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*. **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-Moutou_et_al_2015_5-0) [***b***](#cite_ref-Moutou_et_al_2015_5-1) [***c***](#cite_ref-Moutou_et_al_2015_5-2) [***d***](#cite_ref-Moutou_et_al_2015_5-3) [***e***](#cite_ref-Moutou_et_al_2015_5-4) [***f***](#cite_ref-Moutou_et_al_2015_5-5) [***g***](#cite_ref-Moutou_et_al_2015_5-6) [***h***](#cite_ref-Moutou_et_al_2015_5-7) [***i***](#cite_ref-Moutou_et_al_2015_5-8) Moutou, Claire; et al. (April 2015). "The HARPS search for southern extra-solar planets. XXXVII. Five new long-period giant planets and a system update". *Astronomy & Astrophysics*. **576**: 14. [arXiv](/source/ArXiv_(identifier)):[1412.6591](https://arxiv.org/abs/1412.6591). [Bibcode](/source/Bibcode_(identifier)):[2015A&A...576A..48M](https://ui.adsabs.harvard.edu/abs/2015A&A...576A..48M). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201424965](https://doi.org/10.1051%2F0004-6361%2F201424965). A48.

1. **[^](#cite_ref-SIMBAD_6-0)** ["HD 113538"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+113538). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2021-10-03.

1. **[^](#cite_ref-NStars_7-0)** 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*. **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. **[^](#cite_ref-Moutou_et_al_2011_8-0)** Moutou, Claire; Mayor, Michel; Lo Curto, Gaspare; Ségransan, Damien; Udry, Stéphane; Bouchy, François; Benz, Willy; Lovis, Christophe; Naef, Dominique; Pepe, Francesco; Queloz, Didier; Santos, Nuno C.; Sousa, Sérgio Gonçalves (2010), "The HARPS search for southern extra-solar planets: XXVI: Seven new planetary systems", *Astronomy & Astrophysics*, vol. 527, pp. A63, [arXiv](/source/ArXiv_(identifier)):[1012.3830](https://arxiv.org/abs/1012.3830), [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201015371](https://doi.org/10.1051%2F0004-6361%2F201015371), [S2CID](/source/S2CID_(identifier)) [118696125](https://api.semanticscholar.org/CorpusID:118696125)

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

---
Adapted from the Wikipedia article [HD 113538](https://en.wikipedia.org/wiki/HD_113538) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/HD_113538?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.