Theta Cas
HIP 5542; Theta Cas; 33 Cas
DoubleStar
Cas
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
4.33
Variable Type
Delta Scuti (Pulsating)
Spectral Type
A7V
Star Color
Yellow-white
(B-V 0.17)
Distance
233.0 ly
Position & Identifiers
RA
01h 11m 06.2s
Dec
+55° 08' 59.0"
Constellation
Cas
HR
343
HIP
5542
Bayer
Theta
Flamsteed
33 Cas
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Visibility
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Multiple Star System
Separation
126.4″
Companion Mag
11.3
Position Angle
143°
Star Colors
A: Yellow-white
Discoverer
STT 553
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 126.4″ · PA: 143° · 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
Delta Sct?
Unresolved by speckle interferometry.
Hyades moving group.
Marfak. Name shared with HR 321.
Survey Image
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