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21 Cas

Observable Variable Star Good (56/100)

Range: 5.64 - 6.06, Period: 4.5d, Type: EA/DM

HIP 3572; 21 Cas VariableStar Cas Visible Level 2 Small telescope (4") - Monitor brightness changes
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Physical Properties

Magnitude 5.66
Range 5.64 - 6.06
Period 4.467 days
Variable Type Eclipsing Binary (Algol-type)
Spectral Type A2IV
Star Color White (B-V 0.05)

Position & Identifiers

RA 00h 45m 39.0s
Dec +74° 59' 17.0"
Constellation Cas
HR 192
HIP 3572
Flamsteed 21 Cas
Variable ID YZ Cas
Double Cat 624

Visibility

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Light Curve

Comparison Stars

Nearby stable stars for estimating brightness (AAVSO)

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Multiple Star System

Separation 35.8″
Companion Mag 10.6
Position Angle 160°
Star Colors A: White B: Orange
Discoverer H N 122

Eyepiece View

80x Dawes: 1.9″ TFOV: 0.6°
Realistic = true angular size
N E 160° A (5.7) B (10.6)

Sep: 35.8″ · PA: 160° · N up, E left

Resolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 3.1″

Size Comparison

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Stellar Lifecycle

Spectral Classification

Hertzsprung-Russell Diagram

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Blackbody Spectrum

Stellar Absorption Spectrum

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

Stellar Notes

ADS 624A, EA 5.71 - 6.12B, 4.467224d, i 87.95d. Amp. of primary 0.40V, secondary 0.12V.
Physical pair.
4.4672d, K 73.0k/s, V0 +8.1k/s, asini 4.48.
Also classified A2V + F2V.

Survey Image

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