At magnitude 3.84, Sadachbia is the sixth-brightest in Aquarius, located in the constellation's "Urn". Its name harkens to an older Arabic constellation, and seems to mean "the Lucky Star of the Tents", the Urn perhaps reminding the Arabs of a desert tent. The "Sa" prefix on its name relates obscurely to "luck" in the same way it does with Sadalmelik (α Aqr) and Sadalsuud (β Aqr).
Properties
Sadachbia is an ordinary hot class A0 star with a temperature of 9500 K, much like Vega. Lying 158 light years away, it radiates 62 times more light than the Sun, and is three times the Sun's diameter. Theory and long observation of similar stars in double systems show it to be a hydrogen-fusing main-sequence star with a mass just short of three times solar.
Sadachbia is a spectroscopic binary; its companion orbits every 58 days at a distance at least 0.40 AU. Sadachbia also has a 12th magnitude companion 37" away, but this is merely an optical (line of sight coincidence) double.
Sadachbia was once considered a λ Boo star - an otherwise normal star near class A with unusual deficiencies in heavy elements - but later investigations showed that its chemical composition was more-or-less normal.
[Adapted from STARS by Jim Kaler, Professor Emeritus of Astronomy, University of Illinois]