2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/12787We have identified the ROSAT all-sky survey source RX J1953.1+2115 with a newly discovered dwarf novae (named S 10943 Vulpeculae) with a recurrence time of 83.6 days. With the expected period of ~2.8 hrs (based on the measured superhump period of 2.871 hrs) S 10943 Vul would be the SU Ursae Majoris star with the second largest superhump (and orbital) period known (together with TU Men).to appear in Inf. Bull. Var. Stars 4622 (1998); also available from http://www.obs.aip.de/~jcg/publis.htmlAstrophysicstext