When is the best time to observe BH Canum Venaticorum?

BH Canum Venaticorum is best observed from March through May, with peak visibility during April when it transits around midnight in the Northern Hemisphere.

Where is BH Canum Venaticorum located in the sky?

BH Canum Venaticorum lies in the constellation Canes Venatici at right ascension 13h 35m and declination +37° 11′.

What telescope do I need to see BH Canum Venaticorum?

At magnitude 5.0, BH Canum Venaticorum is visible to the naked eye from dark skies, easy in any binoculars.

BH Canum Venaticorum — Star in Canes Venatici

Star Canes Venatici (CVn) Visible

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1Physical Properties

Magnitude 4.98

Range 4.94 - 5.01

Period 2.6 days

Variable Type RS CVn (Chromospherically Active)

Spectral Type F2IV

Star Color Yellow-white (B-V 0.40)

Distance 148 ly

2Position & Identifiers

RA 13h 34m 47.8s

Dec +37° 10' 57.0"

Constellation Canes Venatici (CVn)

HR 5110

HIP 66257

HD 118216

Variable ID BH CVn

SIMBAD

3How easy to spot?

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Equipment	Bortle 3	Bortle 4	Bortle 5
Naked eye Naked eye	Medium	Medium	Hard+
50 mm finder 50mm finder	Easy	Easy	Easy
150 mm telescope 150mm scope	Easy	Easy	Easy

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)

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Size Comparison

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Spectral Classification

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Hertzsprung-Russell Diagram

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Stellar Lifecycle

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Blackbody Spectrum

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Stellar Absorption Spectrum

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Stellar Fusion

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13Stellar Notes

Variable Star

RS 4.94 - 5.01V, 2.6131738d. Probable reflection effect.

Spectroscopic Binary

2.6132d, K 9.5k/s, V0 +6.4k/s, asini 0.341. Eker and Doherty (1987, MNRAS, 228, 869) observed double lines at high | resolution and provide and alternate orbit. A primary temperature of 6750 K is estimated from Fe/C line ratio, while | equivalent widths of CaI and FeI lines from K-type secondary give 4500-5000 K. Implied spectral type of secondary is | K2IV.

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