| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| 57 Aql A | |
| Right ascension | 19 54 37.65152 |
| Declination | –08° 13′ 38.2390″ |
| Apparent magnitude (V) | 5.70 |
| 57 Aql B | |
| Right ascension | 19 54 38.06165 |
| Declination | –08° 14′ 13.3762″ |
| Apparent magnitude (V) | 6.48 |
| Characteristics | |
| Spectral type | B7 Vn + B8 V |
| U−B color index | –0.49/–0.27 |
| B−V color index | –0.08/–0.04 |
| Astrometry | |
| 57 Aql A | |
| Radial velocity (Rv) | –6 km/s |
| Proper motion (μ) | RA: +6.61 mas/yr Dec.: –25.75 mas/yr |
| Parallax (π) | 6.76 ± 0.37 mas |
| Distance | 480 ± 30 ly (148 ± 8 pc) |
| 57 Aql B | |
| Radial velocity (Rv) | –5 km/s |
| Proper motion (μ) | RA: +2.13 mas/yr Dec.: –30.77 mas/yr |
| Parallax (π) | 6.42 ± 0.58 mas |
| Distance | 510 ± 50 ly (160 ± 10 pc) |
| Details | |
| 57 Aql A | |
| Rotational velocity (v sin i) | 190 km/s |
| 57 Aql B | |
| Rotational velocity (v sin i) | 160 km/s |
| Other designations | |
| 57 Aql A: BD–08 5154, HD 188293, HIP 97966, HR 7593, SAO 143898. | |
| 57 Aql B: BD–08 5155, HD 188294, HIP 97967, HR 7594, SAO 143899. | |
| Database references | |
| SIMBAD | 57 Aql |
| 57 Aql A | |
| 57 Aql B | |
57 Aquilae (abbreviated 57 Aql) is a double star in the constellation of Aquila. 57 Aquilae is its Flamsteed designation. The primary star has an apparent visual magnitude of 5.70, while the secondary is magnitude 6.48. The pair have an angular separation of 35.624 arcseconds and probably form a wide binary star system. The estimated distance of the first component is 480 light-years (150 parsecs), while the second is at 510 light-years (160 parsecs). However, the margin of errors for their respective distance estimates overlap, indicating a probability that they are actually located much closer to each other. Both stars are massive, B-type main sequence stars with rapid rotation rates.
References
- ^ 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.
- ^ Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
- ^ Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590.
- ^ Wilson, Ralph Elmer (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Washington: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W.
- "HR 7593 -- Star in double system", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-07-25.
- "HR 7594 -- Star in double system", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-07-25.
- Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
External links
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