NGC 6826, also known as the "Blinking Planetary Nebula," is a planetary nebula located in the constellation Cygnus. It is approximately 2,500 light-years away from Earth and has a distinct appearance that changes when viewed with different brightness levels, giving it the "blinking" effect. The nebula was discovered by William Herschel in 1787. It features a bright central star surrounded by a glowing shell of gas and dust, which is the remnant of a dying star. NGC 6826 is a popular target for amateur astronomers due to its unique visual characteristics and relatively bright magnitude of around 11.