| Invention or discovery | Date | Inventor or discoverer |
|---|---|---|
| NGC 1240 | September 12, 1784 | William Herschel |
| NGC 616 | August 14, 1863 | Heinrich Louis d'Arrest |
| NGC 2597 | January 13, 1864 | Albert Marth |
| NGC 2378 | February 8, 1878 | Édouard Stephan |
| Invention or discovery | Date | Inventor or discoverer |
|---|---|---|
| NGC 1240 | September 12, 1784 | William Herschel |
| NGC 616 | August 14, 1863 | Heinrich Louis d'Arrest |
| NGC 2597 | January 13, 1864 | Albert Marth |
| NGC 2378 | February 8, 1878 | Édouard Stephan |