Alpha1 Capricorni is a binary star system dominated by a highly luminous star in the constellation of Capricornus, north of the ecliptic. It has the traditional star names Prima Giedi and Algiedi Prima. The Bayer designation Alpha1 Capricorni is Latinized from α1 Capricorni, and abbreviated Alpha1 Cap or α1 Cap. The system is separated from the brighter Alpha2 Capricorni by 0.11° of the sky, a gap resolvable with the naked eye, similar to Mizar and Alcor. Both are not to be confused with much fainter 3 Capricorni nor somewhat fainter Nu Capricorni which are 3 to 6 times the angular distance apart than separate the two Alpha stars, respectively.