The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.
Aquila is a constellation on the celestial equator.
A constellation is a group of stars that are considered to form imaginary outlines or meaningful patterns on the celestial sphere, typically representing animals, mythological people or gods, mythological creatures, or manufactured devices.
A Flamsteed designation is a combination of a number and constellation name that uniquely identifies most naked eye stars in the modern constellations visible from southern England.
A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.