November 11

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2000 20Sigma LIB 20Sigma LIB

Use 20 Sigma for any year on this day.

Name: 20Sigma LIB Brachium
Birthday from Jack’s initial research: Nov 10
Magnitude: 3.3, variable
Spectrum/Star type: Red giant
Distance in Light Years: 290
Diameter compared to Sun: 110
Luminosity compared to Sun: 1900
Date best observed: Jun 22
Additional information: Latin for “Arm”, referring to the Scorpion. This star was once known as gamma sco. A semi-regular variable, it changes from magnitude 3.2 to 3.4 over 20 days. It will become like the famous star Mira some day, dimming to invisibility for long periods. In Upton’s Star Atlas of 1896, Sigma, Tau, and Upsilon LIB were still shown to be in the Scorpion!

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