Tau Tau
Observable Double Star
Good (53/100)
Sep: 62.5", Companion: mag 7.0
HIP 21881; Tau Tau; 94 Tau
DoubleStar
Tau
Visible
Level 2
Small telescope (4") - Requires steady seeing
Physical Properties
Magnitude
4.28
Spectral Type
B3V
Star Color
Blue-white
(B-V -0.13)
Distance
191.9 ly
Position & Identifiers
RA
04h 42m 14.7s
Dec
+22° 57' 25.0"
Constellation
Tau
HR
1497
HIP
21881
Bayer
Tau
Flamsteed
94 Tau
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Visibility
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Multiple Star System
Components
5
Separation
62.5″
Companion Mag
7.0
Position Angle
214°
Star Colors
A: Blue-white
Discoverer
S 455
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 62.5″ · PA: 214° · 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 CPM, 4.3, 8.9v sep. 0.1", 28y? C, 7.3A1V at 63" vsini 100k/s, physical. D. W. Dunham gives 4.9, 5.6v sep. 0.1" and | 4.9, 6.4 sep. 0.0005".
2.9565d, K 53.6k/s, V0 +12.3k/s, msin3i 2.96, asini 2.18. Resolved by speckle interferometry 1983.93, | sep. 0.26".
Cas-Tau OB1.
Survey Image
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