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Thuban

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Thuban
Thuban
Sterrenbeeld Draak (Draco)
Bayer-aanduiding α Dra
Overige aanduidingen 11 Dra (Flamsteed)
HR 5291
HD 123299
SAO 16273
Waarnemingsgegevens
Rechte klimming 14u04m04s
Declinatie
(Epoche 2000)
+64° 22' 33"
Schijnbare magnitude 3,65
Details
Spectraalklasse A0III
Afstand* (lj) 303,119 lj (P=10,76 mas)
Veranderlijk ja, rotatievariabele, alpha Canes Venatici type, amplitude 0,03 magnitude
Meervoudig spectroscopisch binair
afstanden aangegeven als "parallax xxx = yyy lj" zijn herleid uit de in de bron aangegeven parallax
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Astronomie

Thuban (alpha Draconis) is een ster in het sterrenbeeld Draak (Draco).

De ster staat ook bekend als Adib en Staart van de Draak.

Door de precessie van de aardas stond rond 2700 v.Chr. de noordelijke hemelpool in de buurt van deze ster en was Thuban dus de poolster. De pool staat tegenwoordig in de buurt van de ster Polaris.

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Thuban
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