| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 20h 07m 50.36773s [1] |
| Declination | +09° 23′ 59.4022″ [1] |
| Apparent magnitude (V) | 6.443 [2] |
| Characteristics | |
| Spectral type | F3V [3] |
| U−B color index | -0.033 [2] |
| B−V color index | +0.472 [2] |
| Astrometry | |
| Radial velocity (Rv) | −27 [4] km/s |
| Proper motion (μ) |
RA: +46.75
[1]
mas/
yr Dec.: +28.81 [1] mas/ yr |
| Parallax (π) | 25.40 ± 1.00 mas [1] |
| Distance | 128 ± 5
ly (39 ± 2 pc) |
| Other designations | |
| 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
External links
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 | This binary or multiple star system–related article is a stub. You can help Wikipedia by expanding it. |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 20h 07m 50.36773s [1] |
| Declination | +09° 23′ 59.4022″ [1] |
| Apparent magnitude (V) | 6.443 [2] |
| Characteristics | |
| Spectral type | F3V [3] |
| U−B color index | -0.033 [2] |
| B−V color index | +0.472 [2] |
| Astrometry | |
| Radial velocity (Rv) | −27 [4] km/s |
| Proper motion (μ) |
RA: +46.75
[1]
mas/
yr Dec.: +28.81 [1] mas/ yr |
| Parallax (π) | 25.40 ± 1.00 mas [1] |
| Distance | 128 ± 5
ly (39 ± 2 pc) |
| Other designations | |
| 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
External links
| Stars |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| |||||||||||||
| |||||||||||||
| Nebulae |
| ||||||||||||
| Galaxies |
| ||||||||||||
|
| This binary or multiple star system–related article is a stub. You can help Wikipedia by expanding it. |