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HD 129132
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Boötes
Right ascension	19h 40m 05.79185s
Declination	+18° 00′ 50.0046″
Apparent magnitude (V)	6.13
Characteristics
Spectral type	G0V or F4III
B−V color index	0.434±0.004
Astrometry
Radial velocity (Rv)	+1.667±0.0024 km/s
Proper motion (μ)	RA: +14.630 mas/yr ; Dec.: −20.160 mas/yr
Parallax (π)	8.5307 ± 0.1848 mas
Distance	382 ± 8 ly ; (117 ± 3 pc)
Absolute magnitude (MV)	0.82
Orbit
Primary	A
Companion	B
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
Primary	AB
Companion	C
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
A
Mass	1.99 M☉
Radius	17.0+1.7; −1.6 R☉
Luminosity	236.1+5.9; −5.7 L☉
Surface gravity (log g)	3.41 cgs
Temperature	5,488+275; −258 K
Rotational velocity (v sin i)	25.3 km/s
Age	1.00 Gyr
Other designations
	BD+22°2731, HD 129132, HIP 71729, HR 5472, SAO 83458, WDS J14404+2159AB, GSC 01483-00948
Database references
SIMBAD	data

HD 129132 is a triple star^[5] system in the northern constellation of Boötes. It is dimly visible to the naked eye with a combined apparent visual magnitude of 6.13.^[2] The distance to this system is approximately 382 light years based on parallax, and it is drifting further away from the Sun with a radial velocity of +1.7 km/s.^[1]

This system was found to be a spectroscopic binary by the Dominion Astrophysical Observatory in 1923. It was then shown to be a triple star system in 1937 by William E. Harper and Guy H. Blanchet.^[8] The inner pair have an orbital period of 101.6 days and an 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.^[5]^[9]

The primary component appears to be an aging giant star with a stellar classification of F4III,^[4] although it has also been classed as a G-type main-sequence star of type G0V.^[3] It is around a billion years old with twice the mass of the Sun.^[6] The star has expanded to 17^[1] times the Sun's radius and is radiating 236^[1] times the luminosity of the Sun at an effective temperature of 5,488 K.^[1] It is spinning with a projected rotational velocity of 25.3 km/s.^[6]

References

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
^ ^a ^b ^c Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
^ ^a ^b Harlan, E. A.; Taylor, D. C. (March 1970). "MK classifications for F- and G-type stars. II". Astronomical Journal. 75 (2): 165–166. Bibcode:1970AJ.....75..165H. doi:10.1086/110956.
^ ^a ^b 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:1979PASP...91...83C. doi:10.1086/130446.
^ ^a ^b ^c ^d Barlow, D. J.; Scarfe, C. D. (December 1991). "The Spectroscopic-Speckle Triple System HR 5472". Astronomical Journal. 102: 2098. Bibcode:1991AJ....102.2098B. doi:10.1086/116034.
^ ^a ^b ^c ^d ^e ^f Luck, R. Earle (January 2017). "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants". The Astronomical Journal. 153 (1): 19. arXiv:1611.02897. Bibcode:2017AJ....153...21L. doi:10.3847/1538-3881/153/1/21. S2CID 119511744. 21.
^ "HD 129132". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-02-03.
^ 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:1937PDAO....7...99H.
^ Malkov, O. Yu.; Tamazian, V. S.; Docobo, J. A.; Chulkov, D. A. (2012). "Dynamical Masses of a Selected Sample of Orbital Binaries". Astronomy & Astrophysics. 546: 5. Bibcode:2012A&A...546A..69M. doi:10.1051/0004-6361/201219774. A69.

[GaiaDR2-1] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.

[Anderson2012-2] Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.

[Harlan1970-3] Harlan, E. A.; Taylor, D. C. (March 1970). "MK classifications for F- and G-type stars. II". Astronomical Journal. 75 (2): 165–166. Bibcode:1970AJ.....75..165H. doi:10.1086/110956.

[cowley1979-4] 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:1979PASP...91...83C. doi:10.1086/130446.

[Barlow1991-5] Barlow, D. J.; Scarfe, C. D. (December 1991). "The Spectroscopic-Speckle Triple System HR 5472". Astronomical Journal. 102: 2098. Bibcode:1991AJ....102.2098B. doi:10.1086/116034.

[Earle2017-6] ^ ^a ^b ^c ^d ^e ^f Luck, R. Earle (January 2017). "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants". The Astronomical Journal. 153 (1): 19. arXiv:1611.02897. Bibcode:2017AJ....153...21L. doi:10.3847/1538-3881/153/1/21. S2CID 119511744. 21.

[SIMBAD-7] "HD 129132". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-02-03.

[Harper1937-8] 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:1937PDAO....7...99H.

[Yu2012-9] Malkov, O. Yu.; Tamazian, V. S.; Docobo, J. A.; Chulkov, D. A. (2012). "Dynamical Masses of a Selected Sample of Orbital Binaries". Astronomy & Astrophysics. 546: 5. Bibcode:2012A&A...546A..69M. doi:10.1051/0004-6361/201219774. A69.

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