Mu Cep
HIP 107259; Mu Cep
DoubleStar
Cep
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
4.08
Range
3.4 - 5.1
Period
835.000 days
Variable Type
Semi-Regular Variable (Supergiant)
Spectral Type
M2-Ia
Star Color
Red
(B-V 2.35)
Distance
1087.2 ly
Position & Identifiers
RA
21h 43m 30.4s
Dec
+58° 46' 48.0"
Constellation
Cep
HR
8316
HIP
107259
Bayer
Mu
Variable ID
Mu Cep
Double Cat
15271
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Visibility
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Light Curve
Multiple Star System
Components
3
Component IDs
AB
Separation
19.5″
Companion Mag
12.3
Companion Sp
K2II
Position Angle
263°
Star Colors
A: Red
B: Orange
Discoverer
BU 690
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 19.5″ · PA: 263° · 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 15271A, SRc 3.43 - 5.1v, 730d; also a cycle of 4400d. Mean magnitude varies 13.5y. Correspondence between | polarization and light.
Large infrared excess.
Cep OB2.
Ultraviolet FeII emission. STRATOSCOPE II observations indicate infrared H2O bands.
Herschel's "Garnet Star". Both Bayer (1603) and Argelander (1843) showed Mu Cep in the position of 14 Cep = HR | 8406. Heis (1872), however, in cataloguing the stars in Argelander's Atlas, misidentified Mu as the star | currently known as the variable Mu Cep (HR 8316). A third star, 13 Cep (HR 8371), was identified in BAC and | numerous subsequent old catalogues as Mu Cep. See HR 8371, HR 8406.
Survey Image
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