70 Tau
HIP 20661; 70 Tau
DoubleStar
Tau
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
6.46
Spectral Type
F7V
Star Color
Yellow
(B-V 0.49)
Distance
85.8 ly
Position & Identifiers
RA
04h 25m 37.3s
Dec
+15° 56' 27.0"
Constellation
Tau
HR
1391
HIP
20661
Flamsteed
70 Tau
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Visibility
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Multiple Star System
Components
3
Component IDs
AP
Separation
129.5″
Companion Mag
13.4
Position Angle
339°
Star Colors
A: Yellow
Discoverer
BUP 57
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 129.5″ · PA: 339° · 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
AP 7.2 dF5, 7.2, 13.15y, a = 0.133"; occultation binary. Component B, 12.4v at 126". Speckle interferometric sep. of | AP 0.093" 1980.94; 0.094" 1983.93.
Open cluster Mel 25 #57; the Hyades.
Survey Image
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