SS Cygni

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SS Cygni is a variable star in the northern constellation Cygnus (the Swan). It was discovered in 1896 by Louisa D. Wells, a computer working under Edward Pickering at Harvard College Observatory. It is the prototype of the subclass of dwarf novae that show only normal eruptions.

Excerpt from the Wikipedia article “SS Cygni”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: PopePompus, CC BY-SA 4.0, via Wikimedia Commons.