Question

Over half of stars are in binary systems, only some of which can be resolved with telescopes. αcrux (Crux), one of the brightest stars in the southern sky and a multiple star system, is observed to have 0.01as. parallax motion. Two stars are visible and separated by 4 as. (a) How far away are the αcrux stars (What is b)? Express your answer in parsecs. Convert into ly and into m. (b) Using the diagram above, how far apart are the stars? (What is a)? Answer in m and AU. Is it closer or farther away than Pluto?

Answer 1

Tried to solve without diagram.

It is farther way from pluto.