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
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
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Visibility
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Light Curve
Comparison Stars for 21 Cas (5.7–6.1)
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
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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