Revolution of a Binary Star. This figure shows seven observations of the mutual revolution of two stars, one a brown dwarf and one an ultra-cool L dwarf. At center one of the stars is drawn as a red dot surrounded by a blue ellipse. The positions of the companion star at seven different dates are shown as red dots along the blue ellipse. A white arrow points from each red dot on the ellipse to an actual image of the system. Moving clockwise from lower left around the ellipse the observation dates for the individual images are,
{}