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The 19th century
1,725 inventions and discoveries
| Invention or discovery | Date | Inventor or discoverer | Type |
|---|---|---|---|
| NGC 2761 | March 29, 1865 | Albert Marth | radio galaxy |
| NGC 2934 | April 2, 1865 | Albert Marth | lenticular galaxy |
| NGC 3349-2 | April 3, 1865 | Albert Marth | radio galaxy |
| NGC 4493-1 | April 3, 1865 | Albert Marth | galaxy |
| NGC 3186-1 | April 6, 1865 | Albert Marth | Seyfert 1 galaxy |
| NGC 4320 | April 15, 1865 | Heinrich Louis d'Arrest | spiral galaxy |
| NGC 4306 | April 16, 1865 | Heinrich Louis d'Arrest | lenticular galaxy |
| NGC 4523 | April 19, 1865 | Heinrich Louis d'Arrest | spiral galaxy |
| NGC 2277 | April 20, 1865 | Heinrich Louis d'Arrest | galaxy |
| NGC 2284 | April 20, 1865 | Heinrich Louis d'Arrest | galaxy |
| NGC 2285 | April 20, 1865 | Heinrich Louis d'Arrest | galaxy |
| NGC 4408 | April 21, 1865 | Heinrich Louis d'Arrest | lenticular galaxy |
| NGC 4426 | April 21, 1865 | Heinrich Louis d'Arrest | multiple star |
| NGC 4585 | April 21, 1865 | Heinrich Louis d'Arrest | spiral galaxy |
| NGC 4445 | April 24, 1865 | Heinrich Louis d'Arrest | spiral galaxy |
| NGC 4084 | April 26, 1865 | Heinrich Louis d'Arrest | elliptical galaxy |
| NGC 3943 | April 27, 1865 | Heinrich Louis d'Arrest | spiral galaxy |
| NGC 3820 | April 29, 1865 | Heinrich Louis d'Arrest | spiral galaxy |
| NGC 528 | August 22, 1865 | Heinrich Louis d'Arrest | lenticular galaxy |
| NGC 789 | August 24, 1865 | Heinrich Louis d'Arrest | spiral galaxy |
| NGC 688 | September 16, 1865 | Heinrich Louis d'Arrest | barred spiral galaxy |
| NGC 753 | September 16, 1865 | Heinrich Louis d'Arrest | spiral galaxy |
| NGC 843 | September 16, 1865 | Heinrich Louis d'Arrest | asterism |
| NGC 861 | September 18, 1865 | Heinrich Louis d'Arrest | spiral galaxy |
| NGC 656 | September 20, 1865 | Heinrich Louis d'Arrest | lenticular galaxy |
| NGC 590 | September 22, 1865 | Heinrich Louis d'Arrest | spiral galaxy |
| NGC 829 | September 23, 1865 | Heinrich Louis d'Arrest | radio galaxy |
| NGC 830 | September 23, 1865 | Heinrich Louis d'Arrest | lenticular galaxy |
| NGC 786 | September 26, 1865 | Heinrich Louis d'Arrest | spiral galaxy |
| NGC 867 | September 26, 1865 | William Herschel | lenticular galaxy |
| NGC 940 | September 26, 1865 | Heinrich Louis d'Arrest | lenticular galaxy |
| NGC 953 | September 26, 1865 | Heinrich Louis d'Arrest | elliptical galaxy |
| NGC 1050 | September 27, 1865 | Heinrich Louis d'Arrest | spiral galaxy |
| NGC 1285 | October 28, 1865 | Heinrich Louis d'Arrest | spiral galaxy |
| NGC 1303 | October 28, 1865 | Heinrich Louis d'Arrest | lenticular galaxy |
| NGC 1420 | October 28, 1865 | Heinrich Louis d'Arrest | star system |
| NGC 4148 | February 7, 1866 | Heinrich Louis d'Arrest | lenticular galaxy |
| NGC 2794 | March 15, 1866 | Heinrich Louis d'Arrest | spiral galaxy |
| NGC 2797 | March 15, 1866 | Heinrich Louis d'Arrest | intermediate spiral galaxy |
| NGC 3719 | March 15, 1866 | Heinrich Louis d'Arrest | radio galaxy |
| NGC 3720 | March 15, 1866 | Heinrich Louis d'Arrest | spiral galaxy |
| NGC 3716 | April 6, 1866 | Heinrich Louis d'Arrest | lenticular galaxy |
| NGC 3558 | April 15, 1866 | Heinrich Louis d'Arrest | elliptical galaxy |
| 87 Sylvia | May 16, 1866 | N. R. Pogson | asteroid |
| NGC 2591 | August 12, 1866 | Heinrich Louis d'Arrest | spiral galaxy |
| NGC 3759 | August 19, 1866 | Heinrich Louis d'Arrest | lenticular galaxy |
| NGC 3809 | August 20, 1866 | Heinrich Louis d'Arrest | lenticular galaxy |
| NGC 4510 | September 9, 1866 | Heinrich Louis d'Arrest | elliptical galaxy |
| NGC 3538 | September 15, 1866 | Heinrich Louis d'Arrest | galaxy |
| NGC 4481 | October 7, 1866 | Heinrich Louis d'Arrest | spiral galaxy |
| NGC 591 | October 10, 1866 | Lewis A. Swift | lenticular galaxy |
| NGC 778 | November 5, 1866 | Édouard Stephan | lenticular galaxy |
| NGC 769 | November 9, 1866 | Édouard Stephan | spiral galaxy |
| NGC 2410 | February 5, 1867 | Édouard Stephan | spiral galaxy |
| NGC 414 | October 22, 1867 | Herman Schultz | lenticular galaxy |
| NGC 1211 | October 31, 1867 | Édouard Stephan | lenticular galaxy |
| NGC 548 | November 2, 1867 | George Mary Searle | elliptical galaxy |
| NGC 565 | November 2, 1867 | George Mary Searle | spiral galaxy |
| Abydos graffiti | 1868 | Théodule Devéria | graffiti |
| NGC 4247 | February 25, 1868 | George Mary Searle | radio galaxy |