Caldwell 15, also known as the Blinking Planetary Nebula or NGC 6826, is a planetary nebula in the constellation Cygnus, discovered by William Herschel in 1793. It lies roughly 2,000 to 3,300 light-years from Earth and takes its popular name from an optical effect in which its faint outer shell seems to appear and disappear as an observer shifts their gaze between direct and averted vision.
Facts
Classification
Constellation CatalogueNew General Catalogue (NGC) 1 Discovery Year In the Other Atlases
In Constellation
Also in Divinity Atlas: the constellation this subject lies in.
Sources
1. Wikipedia (space and spaceflight articles)
Wikimedia Foundation
2. Wikidata: Caldwell 15
Wikidata Q725474, class allow-list match (w-wdresolver-0926)View the Source NGC 6826 (Wikipedia)
Caldwell 15, Wikipedia - lead section, catalogue classification
NGC 6826 (also known as Caldwell 15) is a planetary nebula located in the constellation Cygnus.
NGC 6826, Wikipedia - lead section, constellation
NGC 6826 (also known as Caldwell 15) is a planetary nebula located in the constellation Cygnus.
View the SourceCaldwell 15 (Wikipedia)
In Group: Planetary Nebulae, Lead sentenceQuote, In Group: Planetary Nebulae, Lead sentence
NGC 6826 (also known as Caldwell 15) is a planetary nebula located in the constellation Cygnus.
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