When is the best time to observe Kappa Cancri?

Kappa Cancri is best observed from January through March, with peak visibility during February when it transits around midnight in the Northern Hemisphere.

Where is Kappa Cancri located in the sky?

Kappa Cancri lies in the constellation Cancer at right ascension 09h 08m and declination +10° 40′.

What telescope do I need to see Kappa Cancri?

At magnitude 5.2, Kappa Cancri is visible to the naked eye from dark skies, easy in any binoculars.

Kappa Cancri — Star in Cancer

Star Cancer (Cnc) Visible

Star Map + List + Plan Star Hop

Observe

1Physical Properties

Magnitude 5.24

Range 5.22 - 5.27

Period 5.0 days

Variable Type ACV:

Spectral Type B8IIIpMn

Star Color Blue-white (B-V -0.11)

2Position & Identifiers

RA 09h 07m 44.8s

Dec +10° 40' 05.0"

Constellation Cancer (Cnc)

HR 3623

HIP 44798

HD 78316

Bayer Kappa

Flamsteed 76 Cnc

Variable ID Kap Cnc

SIMBAD

3How easy to spot?

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Equipment	Bortle 3	Bortle 4	Bortle 5
Naked eye Naked eye	Medium	Hard+	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 Jan – Mar (peak: Feb)

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5

Size Comparison

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Spectral Classification

8

Hertzsprung-Russell Diagram

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Stellar Lifecycle

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Blackbody Spectrum

11

Stellar Absorption Spectrum

Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.

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Stellar Fusion

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13Stellar Notes

Variable Star

Alpha CV 5.22 - 5.27V, 5.0035d.

Double Star

Triple SB system. Combined mag., colors.

Spectroscopic Binary

6.3933d, K 67.4k/s, V0 +24.5k/s, asini 5.88. 5.8 - 7.8v, sep. 0.0003" and 6.0, sep. 0.3".

Spectral

Spectrum shows phosphorus. Magnesium deficient relative to oxygen. Gallium II lines strong. Normal SiII, weak MgII. | Lambda Boo type. HgMn star. It has been suggested that a nearby supernova explosion could have produced reactions | to account for abundance anomalies.