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Delta Per

HIP 17358; Delta Per; 39 Per DoubleStar Per Visible Level 3 Medium telescope (6-8") - Requires steady seeing
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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

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
N E 314° A (3.0) B (11.4)

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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