When is the best time to observe CC Gruis?

CC Gruis is best observed from July through September, with peak visibility during August when it transits around midnight in the Northern Hemisphere.

Where is CC Gruis located in the sky?

CC Gruis lies in the constellation Grus at right ascension 22h 39m and declination -52° 42′.

What telescope do I need to split CC Gruis?

Splitting CC Gruis requires an aperture of roughly 60 mm or larger — the components are separated by about 32.7″ at magnitudes near 6.7. The companion is about 4.8 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

CC Gruis — Double Star in Grus

DoubleStar Grus (Gru) Visible

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Observe

1Physical Properties

Magnitude 6.65

Range 6.62 - 6.68

Period 3.0 hours

Variable Type Delta Scuti (Pulsating)

Spectral Type F1III

Star Color Yellow-white (B-V 0.35)

2Position & Identifiers

RA 22h 39m 08.4s

Dec -52° 41' 32.0"

Constellation Grus (Gru)

HR 8611

HIP 111833

HD 214441

Variable ID CC Gru

SIMBAD

3How easy to split?

Primary 6.7 mag Companion 11.5 mag Separation 32.7″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Hard	V. hard+	V. hard+
150 mm Newton 150mm Newt.	Medium+	Medium	Hard+
Celestron C8 (203 mm SCT) C8 203mm	Medium+	Medium+	Medium

Easy Medium Hard Very hard Impossible

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

4Visibility

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Best season Jul – Sep (peak: Aug)

5Light Curve

6Multiple Star System

Separation 32.7″

Companion Mag 11.5

Position Angle 118°

Star Colors A: Yellow-white B: Orange

Discoverer HJ 5349

Separation over time

Measured 1834 → 2015 (181 y)

Separation drift 30.0" → 32.7" (+2.70")

Rate +0.0149" / y

PA drift 117° → 118° (+1°, +0.006°/y)

Slow change over generations — observable in lifetime comparisons.

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.