Epsilon Per
HIP 18532; Epsilon Per; 45 Per
DoubleStar
Per
Visible
Level 4
Large telescope (10"+) - Requires steady seeing
Physical Properties
Magnitude
2.89
Range
2.89 - 2.91
Period
4.6 hours
Variable Type
Beta Cephei (Pulsating)
Spectral Type
B0III/IV
Star Color
Blue
(B-V -0.18)
Distance
637 ly
Position & Identifiers
RA
03h 57m 51.2s
Dec
+40° 00' 37.0"
Constellation
Per
HR
1220
HIP
18532
Bayer
Epsilon
Flamsteed
45 Per
Variable ID
Eps Per
Double Cat
2888
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Visibility
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Light Curve
Multiple Star System
Components
3
Component IDs
AB
Separation
8.8″
Companion Mag
8.9
Companion Sp
A2V
Position Angle
12°
Star Colors
A: Blue
B: White
Discoverer
STF 471
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 8.8″ · PA: 12° · 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 Fusion
Stellar Notes
Beta C, 2.88 - 3.00V, 0.216:d. Brightest component on visual triple. Photoelectric and spectroscopic resonant periods | found are submultiples of 26.9 hrs or 1.12d.
AB CPM. B, 7.39V, -0.03(B-V), -0.52(U-B), B9.5V, vsini 300:k/s.
Color excess E(B-V) = +0.10.
Cas-Tau OB1; member of Pleiades group.
Survey Image
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