A baya, Jean Texereau ya ɗauki hoto Janus a ranar 29 ga Oktoba 1966 ba tare da gane shi ba. A ranar 18 ga Disamba, Richard Walker ya lura da wani abu a cikin wannan kewayon kamar Janus, amma wanda ba za a iya daidaita matsayinsa da abubuwan da aka gani a baya ba. Shekaru goma sha biyu bayan haka, a watan Oktoba 1978, Stephen M. Larson da John W. Fountain sun fahimci cewa abubuwan da aka gani a 1966 sun fi dacewa da abubuwa biyu daban-daban (Janus da Epimethe) suna raba wurare masu kama da juna, Walker yanzu ana yaba shi da gano Epimethe. Voyager 1 ya tabbatar da wannan tsari na sararin samaniya a 1980.
Audouin Dollfus