Zeta Aquarii [SEP] constellation
Zeta Aquarii
Zeta Aquarii (ζ Aquarii, ζ Aqr) is the Bayer designation for a triple star system; the central star of the "water jar" asterism in the equatorial constellation of Aquarius. The combined apparent visual magnitude of this system is 3.65, which is readily visible to the naked eye. Parallax measurements yield a distance estimate of around from Earth.
Etymology.
In the catalogue of stars in the "Calendarium of Al Achsasi Al Mouakket", this star was designated "Achr al Achbiya" (
has a 26-year orbital period and a semimajor axis of 0.11″. The secondary's mass is .
Zeta Aquarii is currently a northern hemisphere object. In 2004 it was directly above the celestial equator, and before that it was located south of it.
External links.
- Double Stars to Follow, Part IV: Zeta Aquarii and Mu Cygni. by Martin Gaskell, Prairie Astronomy Club Home Page.
- "This Month's Double Stars" by Richard Jaworski.
- Image ζ Aquarii