title: Psi Sagittarii
text: # Psi Sagittarii
  
  Psi Sagittarii, which is Latinized from ψ Sagittarii, is a triple star system in the zodiac constellation of Sagittarius. The star system is located at a distance of 298 light years from the Earth based on parallax, but is drifting closer with a heliocentric radial velocity of −12 km/s. The system is faintly visible to the naked eye has a combined apparent visual magnitude of +4.86.
  
  The inner pair of this triple star system, components Ba and Bb, have an orbital period of 10.78 days and an eccentricity of 0.47. The pair consist of an A-type giant and a less evolved A-type main-sequence star with stellar classifications of A9 III + A3 V, respectively. These in turn share an orbit with the primary, component A, having a period of 20 years and an eccentricity of 0.51. The last is an orange-hued K-type giant with a class of K2 III.
  
  ## Name and etymology
  
  According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, this star was titled as Al Kiladah. This star, together with τ Sgr, ν Sgr, ω Sgr, 60 Sgr and ζ Sgr were Al Udḥiyy, the Ostrich's Nest.
  
  