Matrichakra

Matrichakra is a variable star in the constellation Corona Borealis. Its apparent magnitude varies regularly between apparent magnitude 4.57 and 4.69, and it is around 167 light-years distant. It is visible to the naked eye. Matrichakra is a yellow giant star of spectral type G3.5III that is around 2.4 times as massive as the Sun and has swollen to 7.4 times its radius. It has a surface temperature of 5180 K. For most of its existence, it was a blue-white main sequence star of spectral type B before it ran out of hydrogen fuel in its core. Its luminosity and spectrum suggest it has just crossed the Hertzsprung gap, having finished burning core hydrogen and now begun burning hydrogen in its shell. However, one recent paper gives a 64% chance that it has begun fusing core helium and is on the horizontal branch. It is a strong source of X-rays due to its hot corona.