| 168P/Hergenrother | |
| Discoverer: | Carl W. Hergenrother |
| Discovery Date: | November 22, 1998 |
| Designations: | P/1998 W2 P/2005 N2 |
| Epoch: | March 6, 2006 |
| Semimajor: | 3.632 AU |
| Perihelion: | 1.426 AU |
| Aphelion: | 5.839 AU |
| Eccentricity: | 0.6075 |
| Period: | 6.923 a |
| Inclination: | 21.8934° |
| Last P: | August 5, 2019 October 1, 2012 November 2, 2005 |
| Next P: | 2026-May-18 |
| Earth Moid: | 0.4abbr=unitNaNabbr=unit |
168P/Hergenrother is a periodic comet in the Solar System. The comet originally named P/1998 W2 returned in 2005 and got the temporary name P/2005 N2. The comet was last observed in January 2020, and may have continued fragmenting after the 2012 outburst.
The comet came to perihelion on October 1, 2012, and was expected to reach about apparent magnitude 15.2, but due to an outburst the comet reached apparent magnitude 8. As a result of the outburst of gas and dust, the comet was briefly more than 500 times brighter than it would have been without the outburst. On October 19, 2012, images by the Virtual Telescope Project showed a dust cloud trailing the nucleus. Images by the 2m (07feet) Faulkes Telescope North on October 26, 2012, confirm a fragmentation event. The secondary fragment was about magnitude 17. Further observations by the 8.1m (26.6feet) Gemini telescope show that the comet fragmented into at least four parts.
168P came to perihelion on August 5, 2019, when it was 76 degrees from the Sun. It then made a closest approach to Earth on 6 November 6, 2019, when it was 1abbr=unitNaNabbr=unit from Earth with a solar elongation of about 110 degrees. It was not recovered until January 3, 2020, when it was 141 degrees from the Sun, but only two observations on a single night were reported.