Sigma Cas
Observable Double Star
Excellent (60/100)
Sep: 3.1", Companion: mag 7.2
HIP 118243; Sigma Cas; 8 Cas
DoubleStar
Cas
Visible
Level 4
Large telescope (10"+) - Requires steady seeing
Physical Properties
Magnitude
4.88
Spectral Type
B1V
Star Color
Blue-white
(B-V -0.07)
Distance
543.6 ly
Position & Identifiers
RA
23h 59m 00.5s
Dec
+55° 45' 18.0"
Constellation
Cas
HR
9071
HIP
118243
Bayer
Sigma
Flamsteed
8 Cas
Double Cat
17140
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Visibility
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Multiple Star System
Components
3
Component IDs
AB
Separation
3.1″
Companion Mag
7.2
Position Angle
326°
Star Colors
A: Blue-white
B: Yellow-white
Discoverer
STF3049
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 3.1″ · PA: 326° · 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
AB binary, 5.0v B2III, 7.1v B3V.
ADS 17140B.
Probable foreground star of a sparse group with HR 9045, 9052 and several fainter stars.
Combined spectrum.
Survey Image
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