# HD 109749

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Binary star system in the constellation Centaurus

HD 109749 Observation data Epoch J2000.0 Equinox J2000.0 Constellation Centaurus Right ascension 12h 37m 16.379s[1] Declination −40° 48′ 43.63″[1] Apparent magnitude (V) 8.08[2] Characteristics Spectral type G3 IV[3] or G3 V + K5 V[4] B−V color index 0.714±0.021[2] Astrometry Radial velocity (Rv) −13.24±0.18[2] km/s Proper motion (μ) RA: −157.308 mas/yr[1] Dec.: −6.357 mas/yr[1] Parallax (π) 15.8134±0.0263 mas[1] Distance 206.3 ± 0.3 ly (63.2 ± 0.1 pc) Absolute magnitude (MV) 4.34[2] Details HD 109749 A Mass 1.10[5] M☉ Radius 1.21±0.02[6] R☉ Luminosity 1.55±0.02[6] L☉ Surface gravity (log g) 4.32±0.02[6] cgs Temperature 5,860±39[6] K Metallicity [Fe/H] 0.25±0.05[3] dex Rotation 34 d[3] Rotational velocity (v sin i) 2.5±0.5[3] km/s Age 4.10±0.70[6] Gyr HD 109749 B Mass 0.78[5] M☉ Other designations CD−40 7393, HD 109749, HIP 61595, SAO 223556, WDS J12373-4049, 2MASS J12371639-4048435, Gaia DR2 6147000074988843264[7] Database references SIMBAD data

**HD 109749** is a [binary star](/source/Binary_star) system about 206 [light years](/source/Light_year) away in the [constellation](/source/Constellation) of [Centaurus](/source/Centaurus). The pair have a combined [apparent visual magnitude](/source/Apparent_visual_magnitude) of 8.08,[2] which is too faint to be visible to the naked eye. The primary component has a close orbiting [exoplanet](/source/Exoplanet) companion. The system is drifting closer with a heliocentric [radial velocity](/source/Radial_velocity) of −13.2 km/s.[2]

The primary component, HD 109749 A, is a G-type [subgiant star](/source/Subgiant_star) with a [spectral type](/source/Stellar_classification) of G3IV,[3] indicating it is an evolved star with a luminosity higher than that of a [main sequence](/source/Main_sequence) star. It has a mass of 1.14 M☉ and a radius of 1.21 *R*☉. The star is shining with a luminosity of 1.55 L☉ and has an [effective temperature](/source/Effective_temperature) of 5,860 [K](/source/Kelvin). Evolutionary models estimate an age of 4.1 billion years.[6] HD 109749 A is [chromospherically](/source/Chromosphere) inactive and has a high [metallicity](/source/Metallicity), with an iron abundance 178% of Sun's.[3]

The secondary, HD 109749 B, is a [K-type main sequence star](/source/K-type_main_sequence_star) with an [apparent magnitude](/source/Apparent_magnitude) of 10.3.[8] It has a mass of about 0.78 M☉ and is located at a separation of 8.4 [arcseconds](/source/Arcsecond), which corresponds to a [projected separation](/source/Projected_separation) of 490 AU.[5] This star has the same [proper motion](/source/Proper_motion) as the primary and seems to be at the same distance, confirming they form a physical binary system.[9]

## Planetary system

In 2005, an [exoplanet](/source/Exoplanet) was discovered around HD 109749 A. It was detected by the [radial velocity method](/source/Radial_velocity_method) as part of the [N2K Consortium](/source/N2K_Consortium). It is a [hot Jupiter](/source/Hot_Jupiter) with a [minimum mass](/source/Minimum_mass) of 0.28 MJ and a [semimajor axis](/source/Semimajor_axis) of 0.06 AU.[3]

The HD 190949 A planetary system[10] Companion (in order from star) Mass Semimajor axis (AU) Orbital period (days) Eccentricity Inclination (°) Radius Ab ≥0.27±0.045 MJ 0.0615±0.004 5.239891±0.000099 0 (fixed) — —

## See also

- [HD 149143](/source/HD_149143)

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

## References

1. ^ [***a***](#cite_ref-GaiaDR3_1-0) [***b***](#cite_ref-GaiaDR3_1-1) [***c***](#cite_ref-GaiaDR3_1-2) [***d***](#cite_ref-GaiaDR3_1-3) 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%3D6147000074988843264%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-Anderson_Francis_2012_2-0) [***b***](#cite_ref-Anderson_Francis_2012_2-1) [***c***](#cite_ref-Anderson_Francis_2012_2-2) [***d***](#cite_ref-Anderson_Francis_2012_2-3) [***e***](#cite_ref-Anderson_Francis_2012_2-4) [***f***](#cite_ref-Anderson_Francis_2012_2-5) Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". *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). [S2CID](/source/S2CID_(identifier)) [119257644](https://api.semanticscholar.org/CorpusID:119257644).

1. ^ [***a***](#cite_ref-Fischer2006_3-0) [***b***](#cite_ref-Fischer2006_3-1) [***c***](#cite_ref-Fischer2006_3-2) [***d***](#cite_ref-Fischer2006_3-3) [***e***](#cite_ref-Fischer2006_3-4) [***f***](#cite_ref-Fischer2006_3-5) [***g***](#cite_ref-Fischer2006_3-6) Fischer, Debra A.; et al. (2006). ["The N2K Consortium. III. Short-Period Planets Orbiting HD 149143 and HD 109749"](https://doi.org/10.1086%2F498557). *The Astrophysical Journal*. **637** (2): 1094–1101. [Bibcode](/source/Bibcode_(identifier)):[2006ApJ...637.1094F](https://ui.adsabs.harvard.edu/abs/2006ApJ...637.1094F). [doi](/source/Doi_(identifier)):[10.1086/498557](https://doi.org/10.1086%2F498557).

1. **[^](#cite_ref-Lu_1982_4-0)** Lu, P. K. (April 1982). ["Spectral classification and DD photometry of a southern group of stars with common motions. I."](https://doi.org/10.1086%2F130981) *Publications of the Astronomical Society of the Pacific*. **94**: 304–316. [Bibcode](/source/Bibcode_(identifier)):[1982PASP...94..304L](https://ui.adsabs.harvard.edu/abs/1982PASP...94..304L). [doi](/source/Doi_(identifier)):[10.1086/130981](https://doi.org/10.1086%2F130981).

1. ^ [***a***](#cite_ref-Quarles2019_5-0) [***b***](#cite_ref-Quarles2019_5-1) [***c***](#cite_ref-Quarles2019_5-2) Quarles, Billy; et al. (2020), "Orbital Stability of Circumstellar Planets in Binary Systems", *The Astronomical Journal*, **159** (3): 80, [arXiv](/source/ArXiv_(identifier)):[1912.11019](https://arxiv.org/abs/1912.11019), [Bibcode](/source/Bibcode_(identifier)):[2020AJ....159...80Q](https://ui.adsabs.harvard.edu/abs/2020AJ....159...80Q), [doi](/source/Doi_(identifier)):[10.3847/1538-3881/ab64fa](https://doi.org/10.3847%2F1538-3881%2Fab64fa), [S2CID](/source/S2CID_(identifier)) [209444271](https://api.semanticscholar.org/CorpusID:209444271)

1. ^ [***a***](#cite_ref-Bonfanti2016_6-0) [***b***](#cite_ref-Bonfanti2016_6-1) [***c***](#cite_ref-Bonfanti2016_6-2) [***d***](#cite_ref-Bonfanti2016_6-3) [***e***](#cite_ref-Bonfanti2016_6-4) [***f***](#cite_ref-Bonfanti2016_6-5) Bonfanti, A.; et al. (2016). "Age consistency between exoplanet hosts and field stars". *Astronomy and Astrophysics*. **585**. A5. [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-Simbad_7-0)** ["HD 109749"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+109749). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2018-12-19.

1. **[^](#cite_ref-SIMBAD2_8-0)** ["HD 109749B"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+109749B). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2018-01-20.

1. **[^](#cite_ref-Desidera2007_9-0)** Desidera, S.; Barbieri, M. (January 2007). "Properties of planets in binary systems. The role of binary separation". *Astronomy and Astrophysics*. **462** (1): 345–353. [arXiv](/source/ArXiv_(identifier)):[astro-ph/0610623](https://arxiv.org/abs/astro-ph/0610623). [Bibcode](/source/Bibcode_(identifier)):[2007A&A...462..345D](https://ui.adsabs.harvard.edu/abs/2007A&A...462..345D). [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20066319](https://doi.org/10.1051%2F0004-6361%3A20066319). [S2CID](/source/S2CID_(identifier)) [13813761](https://api.semanticscholar.org/CorpusID:13813761).

1. **[^](#cite_ref-Ment2018_10-0)** Ment, Kristo; et al. (2018). ["Radial Velocities from the N2K Project: Six New Cold Gas Giant Planets Orbiting HD 55696, HD 98736, HD 148164, HD 203473, and HD 211810"](https://doi.org/10.3847%2F1538-3881%2Faae1f5). *The Astronomical Journal*. **156** (5). 213. [arXiv](/source/ArXiv_(identifier)):[1809.01228](https://arxiv.org/abs/1809.01228). [Bibcode](/source/Bibcode_(identifier)):[2018AJ....156..213M](https://ui.adsabs.harvard.edu/abs/2018AJ....156..213M). [doi](/source/Doi_(identifier)):[10.3847/1538-3881/aae1f5](https://doi.org/10.3847%2F1538-3881%2Faae1f5). [S2CID](/source/S2CID_(identifier)) [119243619](https://api.semanticscholar.org/CorpusID:119243619).

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 109749](https://en.wikipedia.org/wiki/HD_109749) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/HD_109749?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.