HIP 20417
Observable Double Star
Fair (27/100)
Sep: 1.9", Companion: mag 8.6
HIP 20417
DoubleStar
Tau
Visible
Level 5
Expert level - Requires steady seeing
Physical Properties
Magnitude
5.91
Spectral Type
M0IIIab+A,F
Star Color
Red
(B-V 1.66)
Distance
217.4 ly
Position & Identifiers
RA
04h 22m 22.8s
Dec
+20° 49' 17.0"
Constellation
Tau
HR
1370
HIP
20417
Double Cat
3158
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Visibility
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Multiple Star System
Separation
1.9″
Companion Mag
8.6
Companion Sp
K3II
Position Angle
168°
Star Colors
A: Red
B: Orange
Discoverer
BU 87
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 1.9″ · PA: 168° · N up, E left
Unresolved · 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
0.003".
Survey Image
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