Shedir
HIP 3179; Alpha Cas; 18 Cas
HIP 3179; Alpha Cas; 18 Cas
DoubleStar
Cas
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
2.23
Spectral Type
K0- IIIa
Star Color
Red
(B-V 1.17)
Distance
228.2 ly
Position & Identifiers
RA
00h 40m 30.5s
Dec
+56° 32' 14.0"
Constellation
Cas
HR
168
HIP
3179
Bayer
Alpha
Flamsteed
18 Cas
Variable ID
Alp Cas
Double Cat
561
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Visibility
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Multiple Star System
Components
4
Component IDs
AD
Separation
24.8″
Companion Mag
14.0
Position Angle
280°
Star Colors
A: Red
Discoverer
BU 1349
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 24.8″ · PA: 280° · 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
Cst 2.20 - 2.27V.
D is 8.5v K2IV-V, vsini <54k/s. All components probably optical.
SHEDIR; Schedar; Schedir.
Survey Image
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