Orbits of Visual Double Stars from P. Couteau's Catalogue Determined with Gaia DR2 and Gaia EDR3 Data

Abstract

The orbits of ten stars discovered by P. Couteau have been determined for the first time: COU 99, 357, 610, 850, 1346, 1531, 1642, 1752, 1845, and 2459. For two of them (COU 850 and 1752) an arc of more than half a revolution is covered by observations; the orbits of the remaining stars have been determined from short arcs ($5^{\circ}{-}50^{\circ}$). The orbits of COU 99, 610, 1346, 1531, and 1845 have been computed using the sums of the component masses estimated from photometric data and trigonometric parallaxes in the Gaia, Hipparcos, and Tycho catalogues. In addition, the orbits of COU 66, 169, 773, 1006, and 1897 have been improved.