90 Tau
HIP 21589; 90 Tau
DoubleStar
Tau
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
4.27
Spectral Type
A6V
Star Color
White
(B-V 0.12)
Distance
135.9 ly
Position & Identifiers
RA
04h 38m 09.5s
Dec
+12° 30' 39.0"
Constellation
Tau
HR
1473
HIP
21589
Flamsteed
90 Tau
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Visibility
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Multiple Star System
Components
3
Component IDs
AC
Separation
52.6″
Companion Mag
13.3
Companion Sp
K4V
Position Angle
314°
Star Colors
A: White
B: Orange
Discoverer
BUP 66
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 52.6″ · 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
In Taurus cluster; Mel 25 #104; the Hyades.
Survey Image
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