Alderamin

Cepheus · α Cep · HR 8162

HIP105199
Visual magnitude2.45
Right ascension (J2000)319.645°
Declination (J2000)62.5856°
WDS J21186+6235
IAU adoption2016/07/20

Name origin

Applied to α Cep since medieval times. The derivation understood since Renaissance times was from al-dhira (al-)yamin, "the Right Forearm," an assumed sci-A descriptive term for α Cep. But this is apparently erroneous. Firstly, in the Almagest, α Cep is described on the right "shoulder" (Arabic al-katif or al-mankib) of Cepheus, whereas no right "forearm" (al-dhira<) is described for the figure. Secondly, in Arabic, "right forearm" is spelled correctly as al-dhira al-yumna, which (in contrast to al-yamin) lacks assonance in the last syllable to Alderamin. Therefore, it is more likely that Alderamin is derived from the various medieval Western abbreviations of muqaddam al-dhira<ain, "the Preceding One of the Two Cubits, or Forearms," which was a sci-A name (based on ind-A) for α Gem. This would have been wrongly transferred to α Cep in medieval times.

Alternative names

  • No alternative names yet.