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The star Gamma Virginis. It is a binary, consisting of a pair of F-type dwarfs each of magnitude 3.5, which orbit each other in a period of 169 years. Together they appear to the naked eye as a star of magnitude 2.7. Porrima lies 38 l.y. away.
From: Porrima in A Dictionary of Astronomy »
Subjects: Astronomy and Astrophysics.
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