40 Per
HIP 17313; 40 Per
DoubleStar
Per
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
4.97
Spectral Type
B0.5V
Star Color
Blue-white
(B-V -0.01)
Position & Identifiers
RA
03h 42m 22.5s
Dec
+33° 57' 54.0"
Constellation
Per
HR
1123
HIP
17313
Flamsteed
40 Per
Double Cat
2699
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Visibility
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Multiple Star System
Separation
19.9″
Companion Mag
10.0
Position Angle
239°
Star Colors
A: Blue-white
Discoverer
STF 431
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 19.9″ · PA: 239° · 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
Reddened star. Color excess E(B-V) = +0.24.
Per OB2.
Survey Image
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