↩ 🔵 🔵 🔵 ❪✺_❫ Astronomical Subs ○ ❪∂❫ Astronomy Math ○ ❪∂_❫ Physical Subs ○ ❪∂_❫ High-Energy Astrophysics Subs ○ ❪∂₌❫ Astronomical Formulations ○ Absolute Magnitude ○◂ Apparent Magnitude ○◂ Primary Mass (M₁) ○◂ Secondary Mass (M₂) ○◂