IAU CPS Satellite Optical Brightness Recommendation: Rationale

Abstract In this Note, we discuss the rationale behind the IAU CPS’s recommendation on satellite brightness for objects in low Earth orbit (LEO). Specifically, we clarify the reasoning behind the chosen altitude dependence and the limitations of this choice. We further discuss some approaches toward brightness limits for objects beyond LEO. This Note is intended for both astronomers and satellite operators in the spirit of furthering mutual cooperation.