This is the main reference [AS 501 = V0627 Cas] AS 501: A new type of symbiotic star with a highly evolved cool component Kolotilov, E. A.; Munari, U.; Yudin, B. F.; Tatarnikov, A. M. Astronomy Reports, Volume 40, Issue 6, November 1996, pp.812-822 abstract viewable at this url http://vsnet.maik.rssi.ru/cgi-bin/search.pl?type=abstract&name=asteng&number=6 &year=96&page=812 (can't find AS 501 or V0627 Cas in Munari et al's catalogue) At 466 days that means Hipparcos is only going to cover 3 cycles at best, which is pushing it a bit (confirmation wise) considering the sparsity and distribution of Hipparcos data. Cheers John