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Thuban

HIP 68756; Alpha Dra; 11 Dra

HIP 68756; Alpha Dra; 11 Dra Star Dra Visible Level 1 Naked eye / Binoculars
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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

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
N E 251° A (3.6) B (5.7)

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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