Blinking planetary
NGC 6826
Properties
Position & Identifiers
Visibility
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Eyepiece View
Blinking planetary · 0.4′ · N up, E left
Filter Response Guide
Central Star
Surface Brightness & Observing Difficulty
Survey Image
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About Blinking planetary
Description
The Blinking Planetary (NGC 6826) is a planetary nebula in Cygnus, about 2,200 light-years away. It gets its name from a remarkable visual effect: when you stare directly at it, the bright central star dominates and the nebula seems to vanish, but with averted vision the nebula reappears.
Observing Tips
Easy to find in Cygnus. In a 4-inch telescope at medium power, try alternating between direct and averted vision to see the "blinking" effect. The nebula is about 25 arcseconds across with a bright central star. Best in summer and autumn.
History
Discovered by William Herschel on September 6, 1793. The blinking effect was noted by observers and gives this planetary nebula one of the most descriptive common names in astronomy.
Fun Facts
Hubble images revealed two red FLIER (Fast Low-Ionization Emission Region) structures on opposite sides of the nebula, jets of material moving at supersonic speeds away from the central star.