Delta Per
HIP 17358; Delta Per; 39 Per
DoubleStar
Per
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
3.01
Variable Type
Alpha2 CVn (Magnetic Rotating)
Spectral Type
B5III
Star Color
Blue-white
(B-V -0.13)
Distance
512.6 ly
Position & Identifiers
RA
03h 42m 55.5s
Dec
+47° 47' 15.0"
Constellation
Per
HR
1122
HIP
17358
Bayer
Delta
Flamsteed
39 Per
Variable ID
Del Per
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Visibility
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Multiple Star System
Separation
104.0″
Companion Mag
11.4
Companion Sp
SB
Position Angle
314°
Star Colors
A: Blue-white
B: Yellow-white
Discoverer
BUP 46
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 104.0″ · PA: 314° · 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
Alpha CV? 2.98 - 3.03V, about 1d. Strong variable emission at 1650A, CaII?
Color excess E(B-V) = +0.04.
Per OB3.
C1 neutral carbon continuum shows discontinuities in UV. Lyman alpha observed from COPERNICUS.
Survey Image
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