57 Aquilae

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Template:Short description

57 Aquilae
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
57 Aql A
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 5.70[2]
57 Aql B
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 6.48[2]
Characteristics
Spectral type B7 Vn + B8 V[3]
U−B Template:Engvar −0.49/−0.27[2]
B−V Template:Engvar −0.08/−0.04[2]
Astrometry
57 Aql A
Radial velocity (Rv)−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]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
57 Aql B
Radial velocity (Rv)−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]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Details
57 Aql A
Rotational velocity (v sin i)190[3] km/s
57 Aql B
Metallicity [Fe/H]{{{metal_fe2}}} dex
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
SIMBAD57 Aql
57 Aql A
57 Aql B

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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 Script error: No such module "convert"., while the second is at Script error: No such module "convert".. 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

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External links

Template:Stars of Aquila


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