Photographic Search for the Minor Planet Sappho [80], AD 7h 15m, D +8° 49’. 30th December 1886, exposure 60 minutes. (titre original)

Roberts, Isaac (1829-1904), “Photographic Search for the Minor Planet Sappho [80], AD 7h 15m, D +8° 49’. 30th December 1886, exposure 60 minutes. (titre original),” Bibliothèque numérique - Observatoire de Paris, consulté le 5 mai 2024, https://bibnum.obspm.fr/ark:/11287/3nPnv.