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Ptolemy discovered M 7 in Scorpius about 130 BC. He published the observation in his work Almagest. Halley re-discovered the open cluster in 1678.
| D | N | NI | Y | I | T | Observer | Name | Con | Type | S | Author | Title |
| 1 | N | 6475 | -130? | E | v | Halley 1678 Lacaille 15.6.1752 |
M 7, Ptolemy's Cluster | SCO | II2r | 4 | Ptolemy | Almagest |