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HD 191104
Observation data; Epoch J2000 Equinox J2000
Constellation	Aquila
Right ascension	20h 07m 50.36773s
Declination	+09° 23′ 59.4022″
Apparent magnitude (V)	6.443
Characteristics
Spectral type	F3V
U−B color index	-0.033
B−V color index	+0.472
Astrometry
Radial velocity (Rv)	−27 km/s
Proper motion (μ)	RA: +46.75 mas/yr ; Dec.: +28.81 mas/yr
Parallax (π)	25.40 ± 1.00 mas
Distance	128 ± 5 ly ; (39 ± 2 pc)
Other designations
	BD+08° 4344, HD 191104, HIP 99158, HR 7693, SAO 125478.
Database references
SIMBAD	data

HD 191104 is a star system in the equatorial constellation of Aquila. Two of the components form a close spectroscopic binary system, while a third star, also thought to be a spectroscopic binary,^[5] orbits the pair at a greater distance.^[6]

References

^ ^a ^b ^c ^d ^e van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600
^ ^a ^b ^c Rakos, K. D.; et al. (February 1982), "Photometric and astrometric observations of close visual binaries", Astronomy and Astrophysics Supplement Series, 47: 221–235, Bibcode:1982A&AS...47..221R
^ Abt, H. A. (March 1981), "Visual multiples. VII - MK classifications", Astrophysical Journal Supplement Series, 45: 437–456, Bibcode:1981ApJS...45..437A, doi:10.1086/190719
^ Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Carnegie Institute of Washington, D.C., Bibcode:1953GCRV..C......0W
^ Tokovinin, A. A. (1997). "MSC - a catalogue of physical multiple stars". Astronomy and Astrophysics Supplement Series. 124: 75–84. Bibcode:1997A&AS..124...75T. doi:10.1051/aas:1997181.
^ Tokovinin, Andrei (April 2014), "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs", The Astronomical Journal, 147 (4): 14, arXiv:1401.6827, Bibcode:2014AJ....147...87T, doi:10.1088/0004-6256/147/4/87, S2CID 56066740, 87