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Het sterrenbeeld Cepheus met onderaan rechts Alderamin (α Cephei)
Sterrenbeeld Cepheus
Bayer-aanduiding α Cep
Rechte klimming 21u18m34,8s
(Epoche 2000)
+62° 35' 8"
Schijnbare magnitude +2,44
Spectraalklasse A7IV[1]
Afstand* (lj) 49,046 lj (P=66,50 mas)[1]
Veranderlijk ja, pulserend Delta Scuti type, amplitude 0,06 magnitude
Meervoudig viervoudig, scheiding 206,8", magnitudeverschil 9,1
afstanden aangegeven als "parallax xxx = yyy lj" zijn herleid uit de in de bron aangegeven parallax

Adleramin (alpha Cephei) is de helderste ster in het sterrenbeeld Cepheus.

De ster staat ook bekend als Alderamin. Rond het jaar 7530 (n.C.) zal deze ster poolster voor de noordelijke hemelpool zijn.

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