Comets that merit careful monitoring
(revision 26-10-2008)
| COMET | SUGGESTED FREQUENCY | REASON |
| 2P | 2 or 3 nights per month | possible aphelic activity |
| 17P | 2 nights per week | possible residual activity |
| 29P | nightly | outbursting |
| 44P | 2 or 3 nights per week | outburst at T+275d in 2001. Currently at T+240d. |
| 67P | 2 or 3 nights per week | Rosetta encounter comet. Approaching perihelion. Perihelic outburst expected. |
| 85P | weekly | Deep impact encounter comet. Not recovered yet. |