When is the best time to observe 39 Comae Berenices?

39 Comae Berenices is best observed from March through May, with peak visibility during April when it transits around midnight in the Northern Hemisphere.

Where is 39 Comae Berenices located in the sky?

39 Comae Berenices lies in the constellation Coma Berenices at right ascension 13h 06m and declination +21° 09′.

What telescope do I need to split 39 Comae Berenices?

Splitting 39 Comae Berenices requires an aperture of roughly 150 mm or larger — the components are separated by about 1.8″ at magnitudes near 6.0. Larger apertures and steady seeing help resolve the pair cleanly.

39 Comae Berenices — Double Star in Coma Berenices

Observable Double Star Fair (25/100)

Sep: 1.8", Companion: mag 8.8

Magnitude 6.0^m DoubleStar Coma Berenices (Com) Visible

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Observe

1Physical Properties

Magnitude 5.99

Spectral Type F4V

Star Color Yellow-white (B-V 0.39)

Distance 109 ly

2Position & Identifiers

RA 13h 06m 21.2s

Dec +21° 09' 12.0"

Constellation Coma Berenices (Com)

HR 4946

HIP 63948

HD 113848

SAO 82650

Flamsteed 39 Com

SIMBAD

3How easy to split?

Primary 6.0 mag Companion 8.8 mag Separation 1.8″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	V. hard+	V. hard+	V. hard+
150 mm Newton 150mm Newt.	Hard+	Hard+	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 Mar – May (peak: Apr)

5Multiple Star System

Separation 1.8″

Companion Mag 8.8

Position Angle 315°

Star Colors A: Yellow-white B: Orange

Discoverer COU 11

Separation over time

Measured 1959 → 2022 (63 y)

Separation drift 1.0" → 1.8" (+0.80")

Rate +0.0127" / y

PA drift 321° → 315° (-6°, -0.095°/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.