Kippax, John Robert, 1849- [from old catalog] · New York and London, G. P. Putnam's sons · leaf 142
It is alwaysa naked-eye object, and its variations are readily recog-nisable. It is an easy double in a two-inch instrument,and a triple star in a three-inch. It was discovered tobe a variable star by Goodricke in 1784, and belongs tothat type in which, the mutually eclipsing bodies are un-equal… … Mount Wilson Solar Observatory Plate VII. Ring Nebula in Lyra
Stars · Constellations · Planets
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