Psi Sagittarii

Psi Sagittarii (ψ Sgr, ψ Sagitarii) is a binary star in the constellation Sagittarius. The star system is 330 light years from Earth. The two stars are separated by 0.15 arcseconds on the sky, which puts them approximately 15 astronomical units apart. The star system has a combined apparent magnitude of +4.86. The orbital period of the system is 18.8 years.

The two components have similar luminosities, with apparent magnitudes of +5.6 and +5.7. Stellar classification is somewhat uncertain. The stars have been classified as either a type A8 dwarf with a type G8 or K0 giant companion, or else a type F2 dwarf with an F7 giant companion.




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