Gamma Cas
HIP 4427; Gamma Cas; 27 Cas
DoubleStar
Cas
Visible
Level 5
Expert level - Requires steady seeing
Physical Properties
Magnitude
2.47
Range
1.6 - 3.0
Period
29.2 hours
Variable Type
Gamma Cassiopeiae (Eruptive Be Star)
Spectral Type
B0.5IVe
Star Color
Blue-white
(B-V -0.15)
Distance
549 ly
Position & Identifiers
RA
00h 56m 42.5s
Dec
+60° 43' 00.0"
Constellation
Cas
HR
264
HIP
4427
Bayer
Gamma
Flamsteed
27 Cas
Variable ID
Gam Cas
Double Cat
782
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Visibility
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Light Curve
Multiple Star System C: optical
Components
3
Component IDs
AB
Separation
2.1″
Companion Mag
10.9
Companion Sp
F6V
Position Angle
259°
Star Colors
A: Blue-white
B: Yellow
Discoverer
BU 1028
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 2.1″ · PA: 259° · N up, E left
Unresolved · 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 Fusion
Stellar Notes
ADS 782A, Gamma Cas 1.6 - 3.0v. Spectrum and color vary. Expanding circumstellar shell. High-velocity variable | mass loss. Variable hydrogen emission, 0.7d. Variable SiIV, CIV, polarization. Variable X-ray source. H alpha | indicates rotating disk-like envelope.
AB CPM.
IR excess.
Cas-Tau OB1; exciting star of HII region S185; in reflection nebula; two peculiar elephant trunks of very different | colors: IC 59 and IC 63.
First emission-line star discovered, by Angelo Secchi in 1866. IRAS satellite observations confirm IR excess and yield | blackbody temperature of about 6750K.
Survey Image
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