Cygnus, AD 19h 55m, D 37° 45’. Photographed 24th August 1886, exposure 60 minutes, 20’’ Reflector (titre original)

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Roberts, Isaac (1829-1904), “Cygnus, AD 19h 55m, D 37° 45’. Photographed 24th August 1886, exposure 60 minutes, 20’’ Reflector (titre original),” Bibliothèque numérique - Observatoire de Paris, consulté le 4 mai 2024, https://bibnum.obspm.fr/ark:/11287/1P8Xf.