The 4-sd approximation in light years (ly) to the distance of the . binary star system of larger Procyan A and smaller Procyon B, in the . Northern Sky, is 11.46 ly. 1 light second (ls) =299792.58 km. 1 ly =(1 ls )X (1 year in seconds) =(299792.458) X (365,256363 X 24 + 60 X 60) km #=9.4609# trillion km, nearly. So, Procyon distance is 9.4609 X 11.46 trillion km =108.4 trillion km, nearly. Here, 1 trillion = 10^12.