| Name | Date/time | RA | Dec | Magnitude | Filter | Site Code |
|---|---|---|---|---|---|---|
| C/1998 J1 | 1998 05 21.38914 | 05 26 17.43 | +02 29 23.9 | 7.5 | N | 426 |
| C/1998 J1 | 1998 05 21.39554 | 05 26 20.02 | +02 28 38.0 | 7.4 | N | 426 |
| C/1998 J1 | 1998 05 22.34381 | 05 32 47.71 | +00 34 59.9 | 10.2 | N | 422 |
| C/1998 J1 | 1998 05 22.34455 | 05 32 47.98 | +00 34 54.8 | 10.2 | N | 422 |
| C/1998 J1 | 1998 05 22.34529 | 05 32 48.30 | +00 34 49.4 | 10.2 | N | 422 |
| C/1998 J1 | 1998 05 22.34603 | 05 32 48.60 | +00 34 44.1 | 10.1 | N | 422 |
| C/1998 J1 | 1998 05 22.34677 | 05 32 48.90 | +00 34 39.1 | 10.0 | N | 422 |
| C/1998 J1 | 1998 05 22.35947 | 05 32 53.95 | +00 33 09.1 | 10.0 | N | 422 |
| C/1998 J1 | 1998 05 22.36023 | 05 32 54.28 | +00 33 03.5 | 10.0 | N | 422 |
| C/1998 J1 | 1998 05 22.36099 | 05 32 54.60 | +00 32 57.8 | 10.1 | N | 422 |
| C/1998 J1 | 1998 05 23.34639 | 05 39 22.71 | -01 21 44.5 | 10.9 | N | 422 |
| C/1998 J1 | 1998 05 23.34713 | 05 39 23.00 | -01 21 49.6 | 11.0 | N | 422 |
| C/1998 J1 | 1998 05 23.34786 | 05 39 23.30 | -01 21 54.6 | 11.1 | N | 422 |
| C/1998 J1 | 1998 05 23.34859 | 05 39 23.57 | -01 21 59.4 | 10.9 | N | 422 |
| C/1998 J1 | 1998 05 23.34932 | 05 39 23.84 | -01 22 04.4 | 10.9 | N | 422 |
| C/1998 J1 | 1998 05 23.35564 | 05 39 26.29 | -01 22 47.9 | 422 | ||
| C/1998 J1 | 1998 05 23.36046 | 05 39 28.14 | -01 23 21.0 | 422 | ||
| C/1998 J1 | 1998 05 23.36843 | 05 39 31.26 | -01 24 16.0 | 8.6 | N | 426 |
| C/1998 J1 | 1998 05 23.37517 | 05 39 33.88 | -01 25 02.3 | 9.0 | N | 426 |
| C/1998 J1 | 1998 05 23.38078 | 05 39 36.03 | -01 25 41.3 | 8.8 | N | 426 |