HIP 20904
HIP 20904
DoubleStar
Tau
Visible
Level 2
Small telescope (4") - Requires steady seeing
Physical Properties
Magnitude
6.40
Spectral Type
F7V
Star Color
Yellow
(B-V 0.52)
Distance
203.8 ly
Position & Identifiers
RA
04h 28m 51.9s
Dec
+30° 21' 41.0"
Constellation
Tau
HR
1406
HIP
20904
Double Cat
3243
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Visibility
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Multiple Star System
Components
4
Component IDs
AB
Separation
14.9″
Companion Mag
8.0
Position Angle
36°
Star Colors
A: Yellow
B: Orange
Discoverer
STF 548
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 14.9″ · PA: 36° · 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
AB binary; C, 11.32V at 121" optical. Fourth component 13.3v at 17" from C.
Survey Image
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