Astronomy:QS Aquilae
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Short description: Star in the constellation Aquila
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 41m 05.528s[2] |
| Declination | +13° 48′ 56.45″[2] |
| Apparent magnitude (V) | 5.988 |
| Characteristics | |
| Spectral type | B5V |
| U−B color index | −0.52 |
| B−V color index | −0.08 |
| Variable type | Eclipsing binary[3] |
| Astrometry | |
| Radial velocity (Rv) | −14.2 ± 2 km/s |
| Proper motion (μ) | RA: −0.04 ± 0.60[2] mas/yr Dec.: −11.47 ± 0.43[2] mas/yr |
| Parallax (π) | 0.49 ± 0.62[2] mas |
| Orbit[3] | |
| Primary | QS Aquilae AB (eclipsing pair) |
| Companion | QS Aquilae C |
| Period (P) | 77.0±4.3 yr |
| Semi-major axis (a) | 0.111±0.045″ |
| Eccentricity (e) | 0.947±0.038 |
| Inclination (i) | 61.2±3.6° |
| Longitude of the node (Ω) | 144.5±5.1° |
| Periastron epoch (T) | 1962.3±2.3 |
| Argument of periastron (ω) (secondary) | 336.8±4.7° |
| Orbit[3] | |
| Primary | QS Aquilae A |
| Companion | QS Aquilae B |
| Period (P) | 2.5132987±0.0000075 d |
| Semi-major axis (a) | 13.78±0.11 R⊙ |
| Inclination (i) | 83.6±1.3° |
| Semi-amplitude (K1) (primary) | 73.98±0.33 km/s |
| Semi-amplitude (K2) (secondary) | 201.76±2.09 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
QS Aquilae is a triple or quadruple star system consisting of an eclipsing binary in a 2.5 day orbit around which a third star orbits in 77 years.[3] There is some indication that there is a fourth component with a period of roughly 18 years.[5] It is located in the constellation Aquila and is barely visible to the naked eye.
References
- ↑ Zasche, P.; Jurysek, J.; Nemravova, J.; Uhlar, R.; Svoboda, P.; Wolf, M.; Honkova, K.; Masek, M. et al. (January 2017). "V773 Cas, QS Aql, and BR Ind: Eclipsing Binaries as Parts of Multiple Systems". The Astronomical Journal 153 (1): 36. doi:10.3847/1538-3881/153/1/36. Bibcode: 2017AJ....153...36Z.
- ↑ 2.0 2.1 2.2 2.3 2.4 van Leeuwen, F. (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.Vizier catalog entry
- ↑ 3.0 3.1 3.2 3.3 Zasche, P. et al. (2017). "V773 Cas, QS Aql, and BR Ind: Eclipsing Binaries as Parts of Multiple Systems". The Astronomical Journal 153 (1): 36. doi:10.3847/1538-3881/153/1/36. Bibcode: 2017AJ....153...36Z.
- ↑ "QS Aquilae". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=QS+Aquilae.
- ↑ Heintze, J.R.W.; Hoekzema, Nico (1989). "The Algol-Type Binary QS AQL". International Astronomical Union Colloquium 107: 344–345. doi:10.1017/s0252921100088011. ISSN 0252-9211.
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