When is the best time to observe 57 Aquilae?

57 Aquilae is best observed from June through August, with peak visibility during July when it transits around midnight in the Northern Hemisphere.

Where is 57 Aquilae located in the sky?

57 Aquilae lies in the constellation Aquila at right ascension 19h 55m and declination -08° 14′.

What telescope do I need to split 57 Aquilae?

Splitting 57 Aquilae requires an aperture of roughly 60 mm or larger — the components are separated by about 36.3″ at magnitudes near 5.7. Larger apertures and steady seeing help resolve the pair cleanly.

57 Aquilae — Double Star in Aquila

Observable Double Star Good (59/100)

Sep: 36.3", Companion: mag 6.3

Magnitude 5.7^m DoubleStar Aquila (Aql) Visible

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Observe

1Physical Properties

Magnitude 5.71

Spectral Type B7Vn

Star Color Blue-white (B-V -0.08)

Distance 326 ly

2Position & Identifiers

RA 19h 54m 37.6s

Dec -08° 13' 38.0"

Constellation Aquila (Aql)

HR 7593

HIP 97966

HD 188293

SAO 143898

Flamsteed 57 Aql

Double Cat 13087

SIMBAD

3How easy to split?

Primary 5.7 mag Companion 6.4 mag Separation 36.3″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Easy	Easy	Easy
150 mm Newton 150mm Newt.	Easy	Easy	Easy
Celestron C8 (203 mm SCT) C8 203mm	Easy	Easy	Easy

Easy Medium Hard Very hard Impossible

Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs

4Visibility

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Best season Jun – Aug (peak: Jul)

5Multiple Star System

Separation 36.3″

Companion Mag 6.3

Companion Sp B8V

Position Angle 171°

Star Colors A: Blue-white B: Blue-white

Discoverer STF2594

Notes

CPM with HR 7594.

Separation over time

Measured 1780 → 2019 (239 y)

Separation drift 29.5" → 36.3" (+6.80")

Rate +0.0285" / y

PA drift 172° → 171° (-1°, -0.004°/y)

Apparent motion is significant on a human timescale — worth revisiting in a decade.

Measured from the WDS observational archive. No orbital solution has been derived — most likely the period is too long to fit an orbit to the available measurement arc.