Alpha Cephei

Also known as Alderamin, 1RXS J211837.1+623513, α Cephei, α Cep, GJ 826, HIP 105199, HIC 105199, ROT 3108

star in the constellation of Cepheus

Key facts

Constellation: Cepheus
Right ascension: 21 18 34.7723
Declination: +62 ° 35 ′ 08.069 ″
Evolutionary stage: Subgiant
Spectral type: A8Vn or A7IV-V
U b color index: +0.12
B v color index: +0.21
Variable type: δ Sct + γ Dor

via Wikipedia infobox

Wikidata facts

Distance from Earth: 48.8
Radius: 2.3
Mass: 1.74
Image: Cepheus constellation map-fr.png

Show 15 more facts

catalog code: TYC 4252-1870-1
spectral class: A5
stellar rotational velocity: 190
apparent magnitude: 2.428267
effective temperature: 7300
right ascension: 319.644884697
declination: 62.585574464
parallax: 66.84
radial velocity: -5.5
metallicity: 0.36
surface gravity: 1600
absolute magnitude: 1.57
right ascension component of proper motion: 151
declination component of proper motion: 49
age estimated by a dating method: 0.82

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Article

Alpha Cephei is a second magnitude star in the northern constellation of Cepheus. It has the official name Alderamin, pronounced /ælˈdɛrəmɪn/; Alpha Cephei is its Bayer designation, which is Latinized from α Cephei and abbreviated Alpha Cep or α Cep. The star is relatively close to Earth at 49 light years (ly) and drifting closer with a heliocentric radial velocity of about −16 km/s.

Nomenclature