Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: Audouin Dollfus ya gano Janus a ranar 15 ga Disamba 1966 kuma ya ba da sunan na wucin gadi S/1966 S 2. A baya, Jean Texereau ya ɗauki hoto Janus a ranar 29 ga Oktoba 1966 ba tare da sanin shi ba. A ranar 18 ga Disamba, Richard Walker ya lura da wani abu a cikin hanyar da Janus yake, amma wanda ba a iya daidaita matsayinsa da abubuwan da aka gani a baya ba. Shekaru goma sha biyu bayan haka, a cikin Oktoba 1978, Stephen M. Larson da John W. Fountain sun fahimci cewa an bayyana abubuwan da aka lura da su a shekarar 1966 ta hanyar abubuwa biyu daban-daban (Janus da Epimetheus) suna raba irin wannan zirga-zirga, Walker yanzu ana yaba shi da gano Epimetheus. Voyager 1 ya tabbatar da wannan tsari a shekara ta 1980. (Duba co-orbital moon don cikakken bayani game da tsarin su na musamman.)  Tambaya: Wanene ya gano Janus a ranar 15 ga Disamba, 1966?
Audouin Dollfus