| Name | Date/time | RA | Dec | Magnitude | Filter | Site Code |
|---|---|---|---|---|---|---|
| C/1998 H1 | 1998 07 20.90486 | 12 19 40.00 | +50 44 26.6 | 17.0 | T | 561 |
| C/1998 H1 | 1998 07 20.90938 | 12 19 40.19 | +50 44 26.9 | 17.1 | T | 561 |
| C/1998 H1 | 1998 07 21.87882 | 12 20 16.45 | +50 44 14.0 | 16.5 | T | 561 |
| C/1998 H1 | 1998 07 21.88333 | 12 20 16.66 | +50 44 14.2 | 16.5 | T | 561 |
| C/1998 H1 | 1998 07 21.88750 | 12 20 16.77 | +50 44 14.3 | 16.4 | T | 561 |
| C/1998 H1 | 1998 07 22.88681 | 12 20 55.56 | +50 44 02.0 | 14.6 | T | 561 |
| C/1998 H1 | 1998 07 22.89618 | 12 20 56.00 | +50 44 02.1 | 15.1 | T | 561 |
| C/1998 H1 | 1998 07 22.90104 | 12 20 56.13 | +50 44 01.7 | 15.9 | T | 561 |
| C/1998 H1 | 1998 07 26.85185 | 12 23 42.86 | +50 43 34.4 | 118 | ||
| C/1998 H1 | 1998 07 26.86580 | 12 23 43.46 | +50 43 34.3 | 17.0 | T | 118 |