| Name | Date/time | RA | Dec | Magnitude | Filter | Site Code |
|---|---|---|---|---|---|---|
| C/1999 Y1 | 2002 10 09.44016 | 17 09 41.53 | -66 25 35.6 | 15.3 | N | 474 |
| C/1999 Y1 | 2002 10 09.44965 | 17 09 41.73 | -66 25 32.3 | 15.4 | N | 474 |
| C/1999 Y1 | 2003 01 29.38049 | 18 21 19.44 | -63 40 51.5 | 17.9 | N | 809 |
| C/1999 Y1 | 2003 01 29.38153 | 18 21 19.45 | -63 40 51.4 | 18.0 | N | 809 |
| C/1999 Y1 | 2003 01 29.38258 | 18 21 19.50 | -63 40 51.5 | 17.9 | N | 809 |
| C/1999 Y1 | 2003 01 29.38439 | 18 21 19.58 | -63 40 52.0 | 18.2 | N | 809 |
| C/1999 Y1 | 2003 01 29.38542 | 18 21 19.62 | -63 40 52.2 | 18.3 | N | 809 |
| C/1999 Y1 | 2003 01 29.38646 | 18 21 19.66 | -63 40 52.3 | 18.4 | N | 809 |
| C/1999 Y1 | 2003 05 04.18193 | 17 37 48.89 | -71 25 21.7 | 18.8 | T | 859 |
| C/1999 Y1 | 2003 05 04.19399 | 17 37 46.94 | -71 25 24.4 | 18.8 | T | 859 |
| C/1999 Y1 | 2003 05 04.20365 | 17 37 46.09 | -71 25 26.6 | 18.9 | T | 859 |
| C/1999 Y1 | 2003 05 11.15330 | 17 23 17.53 | -71 44 20.3 | 19.5 | T | 859 |
| C/1999 Y1 | 2003 05 11.16513 | 17 23 15.80 | -71 44 18.2 | 21.8 | T | 859 |
| C/1999 Y1 | 2003 07 19.93713 | 15 16 01.72 | -66 53 17.6 | 18.6 | N | 859 |
| C/1999 Y1 | 2003 07 19.94767 | 15 16 00.78 | -66 53 14.2 | 18.5 | N | 859 |