QS Aquilae is a triple or quadruple star system consisting of an

eclipsing binary A binary star or binary star system is a Star system, system of two stars that are gravity, gravitationally bound to and in orbit around each other. Binary stars in the night sky that are seen as a single object to the naked eye are often resolved ...

in a 2.5 day orbit around which a third star orbits in 77 years. There is some indication that there is a fourth component with a period of roughly 18 years. Located in the constellation Aquila, its visual

magnitude Magnitude may refer to: Mathematics *Euclidean vector, a quantity defined by both its magnitude and its direction *Magnitude (mathematics), the relative size of an object *Norm (mathematics), a term for the size or length of a vector *Order of ...

varies from 5.93 to 6.06, making it barely visible to the naked eye. The star's variability was discovered photometrically by

Paul Guthnick Paul Guthnick (January 12, 1879 – September 6, 1947) was a German astronomer. Born in Hitdorf am Rhein, he studied at the University of Bonn receiving his doctorate in 1901 under Friedrich Küstner. He worked from 1901 at the Royal Observat ...

and Richard Prager in 1930. It was given its

variable star designation In astronomy, a variable-star designation is a unique identifier given to variable stars. It extends the Bayer designation format, with an identifying label (as described below) preceding the Latin genitive of the name of the constellation in whic ...

in 1934.

References

Aquila (constellation) 185936 Spectroscopic binaries Algol variables Eclipsing binaries Aquilae, QS 7846 B-type main-sequence stars 096840 Durchmusterung objects {{var-star-stub