When is the best time to observe 107 Aquarii?

107 Aquarii is best observed from August through October, with peak visibility during September when it transits around midnight in the Northern Hemisphere.

Where is 107 Aquarii located in the sky?

107 Aquarii lies in the constellation Aquarius at right ascension 23h 46m and declination -18° 41′.

What telescope do I need to split 107 Aquarii?

Splitting 107 Aquarii requires an aperture of roughly 80 mm or larger — the components are separated by about 7.4″ at magnitudes near 5.3. Larger apertures and steady seeing help resolve the pair cleanly.

107 Aquarii — Double Star in Aquarius

Observable Double Star Excellent (63/100)

Sep: 7.4", Companion: mag 6.5

Magnitude 5.3^m DoubleStar Aquarius (Aqr) Visible

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Observe

1Physical Properties

Magnitude 5.29

Spectral Type F2III+F2V giant

Star Color Yellow-white (B-V 0.28)

Distance 272 ly

2Position & Identifiers

RA 23h 46m 00.9s

Dec -18° 40' 41.0"

Constellation Aquarius (Aqr)

HR 9002

HIP 117218

HD 223024

SAO 165867

Flamsteed 107 Aqr

Double Cat 16979

SIMBAD

3How easy to split?

Primary 5.3 mag Companion 6.5 mag Separation 7.4″

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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 Aug – Oct (peak: Sep)

5Multiple Star System

Separation 7.4″

Companion Mag 6.5

Companion Sp F2V

Position Angle 135°

Star Colors A: Yellow-white B: Yellow-white

Discoverer H 2 24

Notes

11813y, a = 14.21". Companion F2III or F2V, sources discordant; vsini 96k/s.

Separation over time

Measured 1800 → 2023 (223 y)

Separation drift 3.3" → 7.4" (+4.10")

Rate +0.0184" / y

PA drift 154° → 135° (-19°, -0.085°/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.