Initially I find planets/moons relatively easy to find, they are bright sprites that appear to move relative to the the background stars when travelling at many times c. The problem I have is that once you get close enough and the object is loaded it often disappears due to the loaded object being small and dark. Even worse, once objects are loaded it seems that if you fly far away the initial bright sprite does not return. This makes it near impossible to find the other four moons from a five moon system, for example, as they remain incredibly small and dark indefinitely as long as you stay in-system. This isn't realistic, as due to their proximity they should be some of the brightest objects in the sky. My suggestion would be to have the brightness of objects turned right up upon loading until they are fairly close so they remain easily visible once the initial sprite disappears, and to have that bright sprite effect return when you get far enough away so that you can reacquire objects easily. Object loading could could benefit from happening bit earlier also, I often see a small bright sprite turn into a much larger planet as I close in which is quite immersion breaking.