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Alpha¹ Capricorni: Wikis


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α¹ Capricorni A/B
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Capricornus
Right ascension 20h17m38.9s
Declination −12°30′30″
Apparent magnitude (V) +4.30/+8.5
Distance 690 ± 140 ly
(211 ± 43 pc)
Spectral type G3Ib
Other designations
Prima Giedi, Algiedi Prima, 5 Capricorni, HR 7747, HD 192876, BD−12°5683, FK5 1527, HIP 100027, SAO 163422, GC 28189, ADS 13632, CCDM J20176-1231
For other star systems with this Bayer designation, see Alpha Capricorni.

Alpha¹ Capricorni (α¹ Cap / α¹ Capricorni) is a binary star in the constellation Capricornus. It also has the traditional star name Prima Giedi or Algiedi Prima, and shares the name Algedi with α² Capricorni. It is approximately 690 light years from Earth.

The primary component, α¹ Capricorni A, is a yellow G-type supergiant with an apparent magnitude of +4.30. Its companion, α¹ Capricorni B, is an eighth magnitude star, separated by 0.65 arcseconds from the primary.


Kaler, Jim (2005). "Algedi". Retrieved July 27, 2005.



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