Recently we got to watch G2 as its orbit took it around the black hole at the center of the galaxy. This showed a visual change in direction along with a corresponding redshift to blue shift change on a relatively short timeline. It was really a great event. Binary stars exhibit the same behavior but where are specific instances of this documented ? I have been unable to locate a catalog binary stars and their orbital periods. I'm sure it exists but all my googles dredge up are generic explanations devoid of any specific named pairs. Are there any other objects besides G1/2 at galactic center, and binary stars, that we have been able to a change in direction and change in redshift ?