57 Aquilae

57 Aquilae
Observation data; Epoch J2000 Equinox J2000
Constellation	Aquila
	57 Aql A
Right ascension	19h 54m 37.65152s
Declination	–08° 13′ 38.2390″
Apparent magnitude (V)	5.70
	57 Aql B
Right ascension	19h 54m 38.06165s
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.^[2] The pair have an angular separation of 35.624 arcseconds and probably form a wide binary star system.^[7] 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,^[1] 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.^[3]

References

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ 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 ^d ^e 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.
^ ^a ^b ^c ^d 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.
^ ^a ^b 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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[aaa474_2_653-1] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ 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.

[clpl4_99-2] 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.

[apj573_1_359-3] 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.

[gcsrv1953-4] 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.

[SIMBAD_A-5] "HR 7593 -- Star in double system", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-07-25.

[SIMBAD_B-6] "HR 7594 -- Star in double system", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-07-25.

[mnras389_2_869-7] 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.

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Observation data Epoch J2000 Equinox J2000
Constellation	Aquila
57 Aql A
Right ascension	19^h 54^m 37.65152^s^[1]
Declination	–08° 13′ 38.2390″^[1]
Apparent magnitude (V)	5.70^[2]
57 Aql B
Right ascension	19^h 54^m 38.06165^s^[1]
Declination	–08° 14′ 13.3762″^[1]
Apparent magnitude (V)	6.48^[2]
Characteristics
Spectral type	B7 Vn + B8 V^[3]
U−B color index	–0.49/–0.27^[2]
B−V color index	–0.08/–0.04^[2]
Astrometry
57 Aql A
Radial velocity (R_v)	–6^[4] km/s
Proper motion (μ)	RA: +6.61^[1] mas/yr Dec.: –25.75^[1] mas/yr
Parallax (π)	6.76 ± 0.37 mas^[1]
Distance	480 ± 30 ly (148 ± 8 pc)
57 Aql B
Radial velocity (R_v)	–5^[4] km/s
Proper motion (μ)	RA: +2.13 mas/yr Dec.: –30.77 mas/yr
Parallax (π)	6.42 ± 0.58 mas^[1]
Distance	510 ± 50 ly (160 ± 10 pc)
Details
57 Aql A
Rotational velocity (v sin i)	190^[3] km/s
57 Aql B
Rotational velocity (v sin i)	160^[3] km/s
Other designations

57 Aql A: BD–08 5154, HD 188293, HIP 97966, HR 7593, SAO 143898.^[5]
57 Aql B: BD–08 5155, HD 188294, HIP 97967, HR 7594, SAO 143899.^[6]
Database references
SIMBAD	57 Aql
	57 Aql A
	57 Aql B