Those are binary (double) stars and the movement in their orbits have
been well known for at least 150 years.

Saul Levy


On Sun, 04 Feb 2007 23:26:06 GMT, HW@....(Henri Wilson) wrote:

In article ,
Henri Wilson HW@....... wrote:

I was really wondering about well separated binary pairs...why they weren't
seen to be changing places more frequently...but again 'distance' probably
provides the answer.
I know some such binaries are recorded, but generally, those in resolvable
orbits will be moving very slowly around their orbits.

However, for very heavy stars, the orbit period at say 0.01 LY radius could
conceivably be less than one hundred years....and movement should be
observable.