| Name | Date/time | RA | Dec | Magnitude | Filter | Site Code |
|---|---|---|---|---|---|---|
| C/1991 Y1 | 1991 12 28.38878 | 21 01 15.80 | +17 17 15.0 | 411 | ||
| C/1991 Y1 | 1991 12 28.78368 | 21 02 45.13 | +17 07 06.4 | 589 | ||
| C/1991 Y1 | 1991 12 29.37604 | 21 05 00.00 | +16 51 33.9 | 897 | ||
| C/1991 Y1 | 1991 12 29.37795 | 21 05 00.36 | +16 51 36.0 | 897 | ||
| C/1991 Y1 | 1991 12 29.40799 | 21 05 07.18 | +16 50 40.0 | 897 | ||
| C/1991 Y1 | 1991 12 30.36486 | 21 08 49.15 | +16 24 58.0 | 10.5 | T | 411 |
| C/1991 Y1 | 1991 12 30.36584 | 21 08 49.38 | +16 24 56.1 | 411 | ||
| C/1991 Y1 | 1991 12 30.36763 | 21 08 49.81 | +16 24 53.2 | 411 | ||
| C/1991 Y1 | 1991 12 30.36862 | 21 08 50.04 | +16 24 52.1 | 411 | ||
| C/1991 Y1 | 1991 12 30.37150 | 21 08 50.67 | +16 24 46.3 | 411 | ||
| C/1991 Y1 | 1991 12 30.37226 | 21 08 50.86 | +16 24 45.2 | 411 | ||
| C/1991 Y1 | 1991 12 30.37300 | 21 08 51.06 | +16 24 43.6 | 411 | ||
| C/1991 Y1 | 1991 12 30.37464 | 21 08 51.42 | +16 24 40.6 | 411 | ||
| C/1991 Y1 | 1991 12 30.37538 | 21 08 51.60 | +16 24 39.1 | 411 | ||
| C/1991 Y1 | 1991 12 30.37612 | 21 08 51.74 | +16 24 39.2 | 411 | ||
| C/1991 Y1 | 1991 12 30.41075 | 21 08 59.75 | +16 23 41.7 | 364 | ||
| C/1991 Y1 | 1991 12 30.41389 | 21 09 00.53 | +16 23 36.3 | 364 | ||
| C/1991 Y1 | 1991 12 31.36730 | 21 12 45.58 | +15 56 52.1 | 411 | ||
| C/1991 Y1 | 1991 12 31.36787 | 21 12 45.74 | +15 56 52.0 | 411 | ||
| C/1991 Y1 | 1991 12 31.36844 | 21 12 45.80 | +15 56 50.3 | 411 |