| Name | Date/time | RA | Dec | Magnitude | Filter | Site Code |
|---|---|---|---|---|---|---|
| C/1998 W3 | 1999 04 09.45127 | 06 11 52.33 | +45 19 45.5 | 402 | ||
| C/1998 W3 | 1999 09 13.03010 | 07 09 31.05 | +55 42 47.9 | 557 | ||
| C/1998 W3 | 1999 09 13.03242 | 07 09 31.05 | +55 42 48.3 | 557 | ||
| C/1998 W3 | 1999 09 13.03475 | 07 09 31.01 | +55 42 49.6 | 557 | ||
| C/1998 W3 | 1999 09 13.03708 | 07 09 31.02 | +55 42 51.3 | 557 | ||
| C/1998 W3 | 1999 10 20.82289 | 06 55 16.30 | +62 33 03.1 | 17.7 | T | 402 |
| C/1998 W3 | 1999 10 20.82416 | 06 55 15.98 | +62 33 04.5 | 402 | ||
| C/1998 W3 | 1999 10 20.82668 | 06 55 15.77 | +62 33 05.8 | 402 | ||
| C/1998 W3 | 1999 11 16.72431 | 06 10 07.20 | +67 25 40.1 | 18.0 | T | 360 |
| C/1998 W3 | 1999 11 16.72830 | 06 10 06.68 | +67 25 41.8 | 360 | ||
| C/1998 W3 | 1999 11 16.73212 | 06 10 06.09 | +67 25 44.2 | 360 | ||
| C/1998 W3 | 1999 12 28.23886 | 04 06 11.68 | +69 02 20.7 | 19.4 | T | 704 |
| C/1998 W3 | 1999 12 28.25535 | 04 06 09.23 | +69 02 17.1 | 19.8 | T | 704 |
| C/1998 W3 | 1999 12 28.27032 | 04 06 06.89 | +69 02 12.3 | 19.8 | T | 704 |
| C/1998 W3 | 2000 01 25.45792 | 03 10 02.72 | +65 48 38.3 | 19.0 | T | 402 |
| C/1998 W3 | 2000 01 25.46022 | 03 10 02.54 | +65 48 36.8 | 402 | ||
| C/1998 W3 | 2000 01 25.46252 | 03 10 02.46 | +65 48 35.9 | 402 | ||
| C/1998 W3 | 2000 03 10.76840 | 02 49 53.10 | +60 57 32.1 | 19.5 | T | 461 |
| C/1998 W3 | 2000 03 10.77271 | 02 49 53.16 | +60 57 31.1 | 461 | ||
| C/1998 W3 | 2000 03 10.77668 | 02 49 53.19 | +60 57 30.5 | 461 |