Chi Centauri

Lore & Background

Chi Centauri has a stellar classification of B2 V, presenting as a young B-type main-sequence star. At an age of around 12 million years, it has 7.1 times the mass of the Sun and 3.5 times the Sun's radius. The star radiates 2,090 times the luminosity of the Sun from its photosphere at an effective temperature of 20,800 K. It is classified as a Beta Cephei type variable star, and its brightness varies by 0.02 magnitudes with a period of 50.40 minutes. Based on parallax measurements, it is located at a distance of approximately 500 light years from Earth, and it is drifting further away with a line of sight velocity component of +12 km/s.

Reader's Guide

Chi Centauri is significant as a Beta Cephei variable, a class of pulsating stars that provide insights into stellar structure and evolution. Its membership in the Upper Centaurus–Lupus sub-group of the Scorpius–Centaurus OB association places it among the nearest co-moving association of massive stars to the Sun, making it a valuable object for studying the formation and dynamics of young stellar groups. The star's rapid 50.40-minute period and small 0.02-magnitude brightness variation are characteristic of its class, and its well-determined physical parameters—mass, radius, luminosity, and temperature—allow for detailed modeling of B-type main-sequence stars. Its proper motion membership in the association confirms its shared origin with other massive stars in the region, contributing to the understanding of star formation in the local Milky Way.

Did You Know?

• It is a proper motion member of the Upper Centaurus–Lupus sub-group in the Scorpius–Centaurus OB association.
• Its effective temperature is 20,800 K, and it radiates 2,090 times the Sun's luminosity.