When is the best time to observe 9 Comae Berenices?

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

Where is 9 Comae Berenices located in the sky?

9 Comae Berenices lies in the constellation Coma Berenices at right ascension 12h 19m and declination +28° 09′.

What telescope do I need to split 9 Comae Berenices?

Splitting 9 Comae Berenices requires an aperture of roughly 60 mm or larger — the components are separated by about 545.5″ at magnitudes near 6.3. Larger apertures and steady seeing help resolve the pair cleanly.

9 Comae Berenices — Double Star in Coma Berenices

Magnitude 6.3^m DoubleStar Coma Berenices (Com) Visible

Star Map + List + Plan Star Hop

Observe

1Physical Properties

Magnitude 6.33

Spectral Type F8V s

Star Color Yellow (B-V 0.50)

Distance 130 ly

2Position & Identifiers

RA 12h 19m 29.6s

Dec +28° 09' 25.0"

Constellation Coma Berenices (Com)

HR 4688

HIP 60098

HD 107213

SAO 82244

Flamsteed 9 Com

SIMBAD

3How easy to split?

Primary 6.3 mag Companion 9.0 mag Separation 545.5″

Sign in and configure your equipment and default location to see a personalized row.

Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Easy	Medium+	Medium+
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 Feb – Apr (peak: Mar)

5Multiple Star System

Separation 545.5″

Companion Mag 8.9

Position Angle 224°

Star Colors A: Yellow B: Orange

Discoverer LEP 53

Separation over time

Measured 1901 → 2015 (114 y)

Separation drift 546.4" → 545.5" (-0.90")

Rate -0.0079" / y

PA drift 224° → 224° (+0°, +0.000°/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.