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29 Nov 1998: The image detection thresholds on the O and E plates were around 24 mag arcsec. ... and 24 mag arcsec. Detected images were parameterised to preserve coordinate, intensity and general shape information.

30 Nov 1998: that magnitude that gives 1 detected photon/s) are: CCD U B V R I Z #1 23.8 25.6 25.7 25.6 24.9 #2 23.8

15 Nov 1998: If a question cannot be answered immediately, due to the complexity of the enquiry for instance, further assistance will be provided with 24 hours of the enquiry being logged.

1 Mar 1998: Exposure Time (mag) (mag/sq arcsec) U 24.75 26.6 700s B 25.75 27.6 600s V 25.25 27.1 600s R 25.00 26.8 775s I ... 24.25 26.1 850s Z 22.50 24.3 600s Maximum practical exposure times assuming gain of unity and taking into account the sky brightness in the

1 Mar 1998: shows. Table 1. Comparison of RIDOS with other Optical Surveys Survey Limiting Mag Sky Area Resolution Availability (R) (sq deg) arcsec (to community) ----------------------------------------------------------------------- RIDOS 24.5 100-200 1 from

30 Nov 1998: 10 27 382 428 0.17 12.7 51P6 09 49 28.5 44 53 43 336 339 0.24 11.7 51P7 09 49 32.1 49 59 40 664 ... 787 0.13 13.7 51P8 09 50 23.2 46 39 22 319 349 0.38 14.0 51P9 09 50 38.6 45 24 33 283 257 0.32

30 Nov 1998: 24.6 48 39 43 824 877 0.11 17.2 52P4 10 24 02.8 45 01 10 566 612 0.18 20.8 52P5 10 24 12.8 46 ... 18 15 4169 4461 0.25 80.0 52P6 10 24 29.4 48 32 38 2652 2988 0.20 50.4 52P7 10 25 25.2 47 20 06 168

30 Nov 1998: 53P1 10 01 04.41 46 40 51.9 34.0 32.6 0.20 24.5 53P2 10 01 51.97 46 19 57.6 20.6 21.2 ... 0.26 13.6 53P107 10 15 33.70 46 24 17.6 14.6 33.3 0.24 12.2.

30 Nov 1998: 54P1 10 38 51.56 46 49 17.2 26.9 25.8 0.24 21.4 54P2 10 39 01.57 46 31 55.0 26.5 26.9 ... 33.0 0.21 17.5 54P5 10 40 13.89 46 30 55.6 46.7 50.0 0.38 53.5 54P6 10 40 24.58 46 32

30 Nov 1998: 48 19.2 45 10 28 95 113 0.30 9.6 67P24 05 48 26.7 43 46 30 329 317 0.24 23.0 67P25 05 48 29.8 ... 4 45 56 43 58 83 0.43 6.2 67P46 05 51 53.7 45 24 54 428 424 0.45 43.3 67P47 05 51 55.0 43 32