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Cysat was the second person to see M 42 through a telescope in 1611. The discoverer is Peiresc, who saw the nebula in Orion a year earlier.
| D | N | NI | Y | I | T | Discoverer | Name | Con | Type | S | Author | Title |
| N | 1976 | 1611 | Rr | v | Peiresc 24.11.1610 | M 42, Orion Nebula | ORI | EN+RN | 2 | Cysat, J. | Mathematica astronomica De Loco (1619) |