Thuban
HIP 68756; Alpha Dra; 11 Dra
HIP 68756; Alpha Dra; 11 Dra
Star
Dra
Visible
Level 1
Naked eye / Binoculars
Physical Properties
Magnitude
3.65
Variable Type
Alpha2 CVn (Magnetic Rotating)
Spectral Type
A0IV
Star Color
Blue-white
(B-V -0.05)
Distance
303.0 ly
Position & Identifiers
RA
14h 04m 23.3s
Dec
+64° 22' 33.0"
Constellation
Dra
HR
5291
HIP
68756
Bayer
Alpha
Flamsteed
11 Dra
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Visibility
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Multiple Star System
Separation
0.0″
Position Angle
251°
Star Colors
A: Blue-white
Discoverer
NOI 4
Eyepiece View
15x
Dawes: 1.9″
TFOV: 3.3°
Realistic = true angular size
Sep: 0.0″ · PA: 251° · N up, E left
Unresolved · 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
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Stellar Notes
Alpha CV?, 3.64 - 3.67V.
51.420d, K 46.9k/s, V0 -13.0k/s, asini 30.7.
High Si and Cr abundance.
THUBAN; Adib; Dragon's Tail. Former Pole Star, about 2700 B.C.
Survey Image
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