Orbits for five southern visual binaries

Abstract

First orbits have been calculated for the visual binaries WDS 00090–5400, 01061–4643, 05248–5219 and 08447–5443 (Alzner & Argyle [CITE]; Argyle & Alzner [CITE]). The current period for the orbit of (Wierzbinski [CITE]) is too short to represent recent observations. The period has been lengthened to 450 years (Alzner & Argyle [CITE]). For 00090–5400 the period is 221 years with a moderate eccentricity; 01061–4643 is currently near periastron but is underobserved; 05248–5219 has passed periastron but there have been no observations since 1993. The visual component of WDS 08447–5443 (= δ Vel), which is not the same as the eclipsing component recently discovered by Otero ([CITE]), has an unexpectedly short period.