30 Tau
HIP 17771; 30 Tau
DoubleStar
Tau
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
5.07
Spectral Type
B3V+F5V
Star Color
Blue-white
(B-V -0.13)
Distance
296.5 ly
Position & Identifiers
RA
03h 48m 16.3s
Dec
+11° 08' 36.0"
Constellation
Tau
HR
1174
HIP
17771
Flamsteed
30 Tau
Double Cat
2778
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Visibility
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Multiple Star System
Separation
9.2″
Companion Mag
9.8
Companion Sp
F5V
Position Angle
60°
Star Colors
A: Blue-white
B: Yellow-white
Discoverer
STF 452
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 9.2″ · PA: 60° · 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
Binary.
Cas-Tau OB1.
Comp. B +17.2k/s; F5V or F3Vp.
Survey Image
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