Astronomy:HD 191104
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Short description: Star in the constellation Aquila
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Aquila[1] |
| Right ascension | 20h 07m 50.36773s[2] |
| Declination | +09° 23′ 59.4022″[2] |
| Apparent magnitude (V) | 6.443[3] |
| Characteristics | |
| Spectral type | F3V[4] |
| U−B color index | −0.033[3] |
| B−V color index | +0.472[3] |
| Astrometry | |
| Radial velocity (Rv) | −27[5] km/s |
| Proper motion (μ) | RA: +46.75[2] mas/yr Dec.: +28.81[2] mas/yr |
| Parallax (π) | 25.40 ± 1.00[2] mas |
| Distance | 128 ± 5 ly (39 ± 2 pc) |
| Absolute magnitude (MV) | +3.46[1] |
| Orbit | |
| Primary | A |
| Companion | B |
| Period (P) | 604.7[6] yr |
| Semi-major axis (a) | 3.4[7]″ |
| Orbit[6] | |
| Primary | Ba |
| Companion | Bb |
| Period (P) | 23.8 days |
| Eccentricity (e) | 0.123 |
| Semi-amplitude (K1) (primary) | 16.2 km/s |
| Semi-amplitude (K2) (secondary) | 16.6 km/s |
| Details | |
| A | |
| Mass | 1.2[6] M☉ |
| Radius | 1.4[8] R☉ |
| Luminosity | 2.9[8] L☉ |
| Temperature | 6,615[8] K |
| Rotation | 9.34[9] days |
| Age | 722[8] Myr |
| Ba | |
| Mass | 0.74[6] M☉ |
| Bb | |
| Mass | 0.72[6] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
| A | |
| B | |
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,[6] orbits the pair at a greater distance.[10]
References
- ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A
- ↑ 2.0 2.1 2.2 2.3 2.4 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V
- ↑ 3.0 3.1 3.2 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, doi:10.1086/190719, Bibcode: 1981ApJS...45..437A
- ↑ 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
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 Tokovinin, A. A. (1997). "MSC - a catalogue of physical multiple stars". Astronomy and Astrophysics Supplement Series 124: 75–84. doi:10.1051/aas:1997181. Bibcode: 1997A&AS..124...75T.
- ↑ Tokovinin, A. A. (1998), "New spectroscopic components in six multiple systems", Astronomy Letters 24 (3): 288, Bibcode: 1998AstL...24..288T
- ↑ 8.0 8.1 8.2 8.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ Oelkers, Ryan J.; Rodriguez, Joseph E.; Stassun, Keivan G.; Pepper, Joshua; Somers, Garrett; Kafka, Stella; Stevens, Daniel J.; Beatty, Thomas G. et al. (2018), "Variability Properties of Four Million Sources in the TESS Input Catalog Observed with the Kilodegree Extremely Little Telescope Survey", The Astronomical Journal 155 (1): 39, doi:10.3847/1538-3881/aa9bf4, Bibcode: 2018AJ....155...39O
- ↑ Tokovinin, Andrei (April 2014), "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs", The Astronomical Journal 147 (4): 14, doi:10.1088/0004-6256/147/4/87, 87, Bibcode: 2014AJ....147...87T
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