When is the best time to observe 12 Capricorni?

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

Where is 12 Capricorni located in the sky?

12 Capricorni lies in the constellation Capricornus at right ascension 20h 30m and declination -18° 35′.

What telescope do I need to split 12 Capricorni?

Splitting 12 Capricorni requires an aperture of roughly 60 mm or larger — the components are separated by about 22.0″ at magnitudes near 5.9. Larger apertures and steady seeing help resolve the pair cleanly.

12 Capricorni — Double Star in Capricornus

Observable Double Star Excellent (62/100)

Sep: 22.0", Companion: mag 6.7

Magnitude 5.9^m DoubleStar Capricornus (Cap) Visible

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Observe

1Physical Properties

Magnitude 5.94

Spectral Type A3Vn

Star Color White (B-V 0.08)

2Position & Identifiers

RA 20h 29m 53.9s

Dec -18° 34' 60.0"

Constellation Capricornus (Cap)

HR 7830

HIP 101123

HD 195094

SAO 163626

Flamsteed 12 Cap

Double Cat 13902

SIMBAD

3How easy to split?

Primary 5.9 mag Companion 6.7 mag Separation 22.0″

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

Set a location in User Settings to see visibility data.

Best season Jun – Aug (peak: Jul)

5Multiple Star System

Separation 22.0″

Companion Mag 6.7

Companion Sp A7V

Position Angle 238°

Star Colors A: White B: Yellow-white

Discoverer SHJ 324

Notes

CPM with HR 7829.

Separation over time

Measured 1777 → 2019 (242 y)

Separation drift 25.0" → 22.0" (-3.00")

Rate -0.0124" / y

PA drift 243° → 238° (-5°, -0.021°/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.