| Invention or discovery | Date | Inventor or discoverer |
|---|---|---|
| C/2001 Q4 | August 24, 2001 | Near-Earth Asteroid Tracking |
| C/2006 M4 | June 20, 2006 | Michael Mattiazzo |
| C/2021 O3 (PanSTARRS) | July 26, 2021 | Pan-STARRS |
| C/2021 T4 | October 7, 2021 | Mount Lemmon Survey |
| Invention or discovery | Date | Inventor or discoverer |
|---|---|---|
| C/2001 Q4 | August 24, 2001 | Near-Earth Asteroid Tracking |
| C/2006 M4 | June 20, 2006 | Michael Mattiazzo |
| C/2021 O3 (PanSTARRS) | July 26, 2021 | Pan-STARRS |
| C/2021 T4 | October 7, 2021 | Mount Lemmon Survey |