# HD 129132

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Triple star system in the constellation Boötes

HD 129132 Observation data Epoch J2000.0 Equinox J2000.0 Constellation Boötes[1] Right ascension 14h 40m 21.86915s[2] Declination +21° 58′ 33.1217″[2] Apparent magnitude (V) 6.13[1] Characteristics Spectral type G0V[3] or F4III[4] B−V color index 0.434±0.004[1] Astrometry Radial velocity (Rv) +1.667±0.0024[5] km/s Proper motion (μ) RA: +15.157[2] mas/yr Dec.: −39.067[2] mas/yr Parallax (π) 10.0986±0.1285 mas[2] Distance 323 ± 4 ly (99 ± 1 pc) Absolute magnitude (MV) 0.82[1] Orbit[6] Primary Aa1 Name Aa2 Period (P) 101.606±0.003 d Semi-major axis (a) ≥26.4±0.2 Gm Eccentricity (e) 0.117±0.007 Periastron epoch (T) 2,442,478.0±0.8 HJD Semi-amplitude (K1) (primary) 19.0±0.1 km/s Orbit[6] Primary Aa Name Ab Period (P) 3,385±7 d Semi-major axis (a) 0.074±0.001" (407±6 Gm) Eccentricity (e) 0.073±0.010 Inclination (i) 104.6±0.5° Periastron epoch (T) 2,442,880±40 HJD Argument of periastron (ω) (secondary) 91.4±4.1° Semi-amplitude (K1) (primary) 8.5±0.1 km/s Details Aa1 Mass 1.99[7] M☉ Radius 17.0+1.7 −1.6[5] R☉ Luminosity 236.1+5.9 −5.7[5] L☉ Surface gravity (log g) 3.41[7] cgs Temperature 5,488+275 −258[5] K Rotational velocity (v sin i) 25.3[7] km/s Age 1.00[7] Gyr Aa2 Mass 1.29[8] M☉ Ab Mass 1.82[8] M☉ Other designations BD+22°2731, HD 129132, HIP 71729, HR 5472, SAO 83458, WDS J14404+2159AB, GSC 01483-00948[9] Database references SIMBAD data

**HD 129132** is a [triple star](/source/Triple_star)[6] system in the northern [constellation](/source/Constellation) of [Boötes](/source/Bo%C3%B6tes). It is dimly visible to the naked eye with a combined [apparent visual magnitude](/source/Apparent_visual_magnitude) of 6.13.[1] The distance to this system is approximately 382 [light years](/source/Light_year) based on [parallax](/source/Stellar_parallax), and it is drifting further away from the [Sun](/source/Sun) with a [radial velocity](/source/Radial_velocity) of +1.7 km/s.[5]

This system was found to be a [spectroscopic binary](/source/Spectroscopic_binary) by the [Dominion Astrophysical Observatory](/source/Dominion_Astrophysical_Observatory) in 1923. It was then shown to be a triple star system in 1937 by [William E. Harper](/source/William_Edmund_Harper) and Guy H. Blanchet.[10] The inner pair have an [orbital period](/source/Orbital_period) of 101.6 days and an [eccentricity](/source/Orbital_eccentricity) of 0.117, with the primary forming the visible component of this pair. The third component forms a visual system with the inner pair, orbiting with a period of 9.27 years and an eccentricity of 0.073.[6][11]

The primary component appears to be an aging [giant star](/source/Giant_star) with a [stellar classification](/source/Stellar_classification) of F4III,[4] although it has also been classed as a [G-type main-sequence star](/source/G-type_main-sequence_star) of type G0V.[3] It is around a billion years old with twice the [mass of the Sun](/source/Mass_of_the_Sun).[7] The star has expanded to 17 times the [Sun's radius](/source/Sun's_radius)[5] and is radiating 236 times the [luminosity of the Sun](/source/Luminosity_of_the_Sun)[5] at an [effective temperature](/source/Effective_temperature) of 5,488 K.[5] It is spinning with a [projected rotational velocity](/source/Projected_rotational_velocity) of 25.3 km/s.[7]

## 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) 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-GaiaDR3_2-0) [***b***](#cite_ref-GaiaDR3_2-1) [***c***](#cite_ref-GaiaDR3_2-2) [***d***](#cite_ref-GaiaDR3_2-3) [***e***](#cite_ref-GaiaDR3_2-4) 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%3D1824277055360974720%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-Harlan1970_3-0) [***b***](#cite_ref-Harlan1970_3-1) Harlan, E. A.; Taylor, D. C. (March 1970). "MK classifications for F- and G-type stars. II". *Astronomical Journal*. **75** (2): 165–166. [Bibcode](/source/Bibcode_(identifier)):[1970AJ.....75..165H](https://ui.adsabs.harvard.edu/abs/1970AJ.....75..165H). [doi](/source/Doi_(identifier)):[10.1086/110956](https://doi.org/10.1086%2F110956).

1. ^ [***a***](#cite_ref-cowley1979_4-0) [***b***](#cite_ref-cowley1979_4-1) Cowley, A. P.; Bidelman, W. P. (February 1979). "MK spectral types for some F and G stars". *Publications of the Astronomical Society of the Pacific*. **91**: 83–86. [Bibcode](/source/Bibcode_(identifier)):[1979PASP...91...83C](https://ui.adsabs.harvard.edu/abs/1979PASP...91...83C). [doi](/source/Doi_(identifier)):[10.1086/130446](https://doi.org/10.1086%2F130446).

1. ^ [***a***](#cite_ref-GaiaDR2_5-0) [***b***](#cite_ref-GaiaDR2_5-1) [***c***](#cite_ref-GaiaDR2_5-2) [***d***](#cite_ref-GaiaDR2_5-3) [***e***](#cite_ref-GaiaDR2_5-4) [***f***](#cite_ref-GaiaDR2_5-5) [***g***](#cite_ref-GaiaDR2_5-6) [***h***](#cite_ref-GaiaDR2_5-7) [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%201824277055360974720) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-Barlow1991_6-0) [***b***](#cite_ref-Barlow1991_6-1) [***c***](#cite_ref-Barlow1991_6-2) [***d***](#cite_ref-Barlow1991_6-3) Barlow, D. J.; Scarfe, C. D. (December 1991). "The Spectroscopic-Speckle Triple System HR 5472". *Astronomical Journal*. **102**: 2098. [Bibcode](/source/Bibcode_(identifier)):[1991AJ....102.2098B](https://ui.adsabs.harvard.edu/abs/1991AJ....102.2098B). [doi](/source/Doi_(identifier)):[10.1086/116034](https://doi.org/10.1086%2F116034).

1. ^ [***a***](#cite_ref-Earle2017_7-0) [***b***](#cite_ref-Earle2017_7-1) [***c***](#cite_ref-Earle2017_7-2) [***d***](#cite_ref-Earle2017_7-3) [***e***](#cite_ref-Earle2017_7-4) [***f***](#cite_ref-Earle2017_7-5) Luck, R. Earle (January 2017). ["Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants"](https://doi.org/10.3847%2F1538-3881%2F153%2F1%2F21). *The Astronomical Journal*. **153** (1): 19. [arXiv](/source/ArXiv_(identifier)):[1611.02897](https://arxiv.org/abs/1611.02897). [Bibcode](/source/Bibcode_(identifier)):[2017AJ....153...21L](https://ui.adsabs.harvard.edu/abs/2017AJ....153...21L). [doi](/source/Doi_(identifier)):[10.3847/1538-3881/153/1/21](https://doi.org/10.3847%2F1538-3881%2F153%2F1%2F21). [S2CID](/source/S2CID_(identifier)) [119511744](https://api.semanticscholar.org/CorpusID:119511744). 21.

1. ^ [***a***](#cite_ref-msc_8-0) [***b***](#cite_ref-msc_8-1) Tokovinin, Andrei (2018). ["The Updated Multiple Star Catalog"](https://doi.org/10.3847%2F1538-4365%2Faaa1a5). *The Astrophysical Journal Supplement Series*. **235** (1): 6. [arXiv](/source/ArXiv_(identifier)):[1712.04750](https://arxiv.org/abs/1712.04750). [Bibcode](/source/Bibcode_(identifier)):[2018ApJS..235....6T](https://ui.adsabs.harvard.edu/abs/2018ApJS..235....6T). [doi](/source/Doi_(identifier)):[10.3847/1538-4365/aaa1a5](https://doi.org/10.3847%2F1538-4365%2Faaa1a5).

1. **[^](#cite_ref-SIMBAD_9-0)** ["HD 129132"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+129132). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2020-02-03.

1. **[^](#cite_ref-Harper1937_10-0)** Harper, W. E.; Blanchet, G. H. (July 1937). "The spectroscopic orbits of H. R. 5472". *Publications of the Dominion Observatory Ottawa*. **7**: 99-104. [Bibcode](/source/Bibcode_(identifier)):[1937PDAO....7...99H](https://ui.adsabs.harvard.edu/abs/1937PDAO....7...99H).

1. **[^](#cite_ref-Yu2012_11-0)** Malkov, O. Yu.; Tamazian, V. S.; Docobo, J. A.; Chulkov, D. A. (2012). ["Dynamical Masses of a Selected Sample of Orbital Binaries"](https://doi.org/10.1051%2F0004-6361%2F201219774). *Astronomy & Astrophysics*. **546**: 5. [Bibcode](/source/Bibcode_(identifier)):[2012A&A...546A..69M](https://ui.adsabs.harvard.edu/abs/2012A&A...546A..69M). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201219774](https://doi.org/10.1051%2F0004-6361%2F201219774). A69.

v t e Constellation of Boötes Boötes in Chinese astronomy Boötes Void List of stars in Boötes Stars Bayer α (Arcturus) β (Nekkar) γ (Seginus) δ (Qigong) ε (Izar, Pulcherrima) ζ η (Muphrid) θ ι κ λ (Xuange) μ1 (Alkalurops) μ2 ν1 ν2 ξ ο π ρ (Kalasungsang) σ (Genghe) τ (Tepiamenit) υ φ χ ψ ω Flamsteed 1 2 3 6 (e) 7 9 10 11 12 (d) 13 14 15 18 20 22 (f) 24 (g) 26 31 32 33 34 (Alrumh) 38 (Merga) 39 40 44 (Quadrans) 45 (c) 46 (b) 47 (k) 50 Variable R S T RX ZZ AB BL BP BX BY CE CH CI CN CP CR CX CY (101 Vir) DE EK HN HP HD 118508 118889 122563 125040 125351 (A) 125658 126128 126129 126141 126200 126271 127304 127334 127726 128093 128198 129132 129357 130084 130603 130917 131040 131473 131496 (Arcalís) 132029 132406 132563 134064 134335 135438 135530 135944 141399 Other 2MASS J15031961+2525196 CFBDSIR 1458+10 Gliese 526 HAT-P-4 LHS 2924 PSR J1544+4937 SDSS J1416+1348 SDSS J1433+1011 TVLM 513-46546 WASP-14 WD 1425+540 ZTF J153932.16+502738.8 Exoplanets HAT-P-4b HD 128311 b c HD 132406 b HD 136418 b (Awasis) τ Boötis b TOI-1853 b WASP-14b Star clusters NGC 5466 Galaxies NGC 5008 5248 5251 5416 5490 5500 5504 5508 5514 5523 5529 5532 5533 5535 5539 5541 5544 5545 5548 5557 5559 5562 5579 5582 5591 5601 5603 5609 5613 5614 5615 5624 5629 5630 5641 5642 5653 5665 5676 5681 5682 5683 5698 5714 5722 5752 5753 5754 5755 5772 5778 5784 5790 5820 5821 5829 5837 5857 5875 5876 5886 5888 5896 5929 5930 5966 Numbered I II III Other 3C 295 3C 299 3C 300 3C 303 3C 315 4C 19.44 4C +26.42 7C 1354+2552 Abell 2009 BCG Arp 302 B2 1420+32 B2 1441+26 CEERS-2112 CEERS-93316 CEERS2-588 CLASS B1359+154 Cloverleaf quasar DDO 190 EGS-zs8-1 EGS-z11-R0 EGSY8p7 H1426+428 IC 4397 IC 4461 IC 4462 IC 4481 IC 4516 IRAS 13349+2438 IRAS 14394+5332 IRAS 15206+3342 LEDA 2108986 MACS 1423-z7p64 MACS J1447.4+0827 BCG Maisie's Galaxy Markarian 463 Markarian 471 Markarian 478 MS 1455.0+2232 BCG MS 1512-cB58 NVSS J141343+433945 OQ 172 OQ 530 PG 1411+442 PG 1543+489 PGC 93125 PGC 1470080 PKS 1345+125 PKS 1413+135 QSO B1422+202 RBS 1467 RGZ J145001.5+144747 RGZ J145039.8+441829 SBS 1415+437 SDSS J135646.10+102609.0 SDSS J1430+2303 Teacup galaxy UGC 8669 UGC 9128 UGC 9425 UGC 9684 UGC 9796 ULAS J1342+0928 VV 191 Galaxy clusters Abell 1795 Abell 1991 BoRG-58 IDCS J1426.5+3508 Astronomical events GRB 990123 GRB 080319B SCP 06F6 SN 2003fg SN 2005bc SN 2020tlf Category

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