QU Normae

QU Normae, also known as HR 6131, is a blue supergiant star in the constellation Norma. It is also a variable star, thought to be an α Cyg variable.
The apparent magnitude of QU Normae varies somewhat irregularly between 5.27 and 5.41. The General Catalogue of Variable Stars quotes a period of 4.818 days, but other research only shows likely periods longer than 10 days.
File:QUNorLightCurve.png|thumb|left|A light curve for QU Normae, plotted from Hipparcos data
QU Normae has a spectral type B1.5 Ia, a luminous supergiant that has swollen and cooled off the main sequence. Surface abundances suggest that it has not yet passed through a red supergiant phase. Around 5,000 light-years distant, it shines with a luminosity approximately 417,000 times that of the Sun and has a diameter around 110 times that of the Sun.