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]

SpectraltypeB7 Vn + B8 V^[3]

U−B color index−0.49/−0.27^[2]

Quick facts Observation data Epoch J2000 Equinox J2000, Apparent magnitude (V) ...

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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

References