🔵 Tiansi – γ Cas
Eruptive Be star in #Cassiopeia, mag 2.4.
🌡️ 26,500 K | 18.7 M☉ | 10.9 R☉ | 549 ly
Name Tiān Sì (“Heavenly Quadriga”), a 2,000-year-old Chinese asterism.
A high-mass X-ray system; X-rays likely from the Be star + disk.
#Tiansi #IAUStarNames