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- Date: 1998
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The APM Sky Catalogues: Brief Details of the Catalogues
https://people.ast.cam.ac.uk/~mike/apmcat/details.html29 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. -
INT WFC User Notes - 4 EEV CCDs
https://people.ast.cam.ac.uk/~mike/casu/WFCsur/wfc_notes_apr98.html30 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 -
https://people.ast.cam.ac.uk/~rgm/wfcsur/jsc_ridos.txt
https://people.ast.cam.ac.uk/~rgm/wfcsur/jsc_ridos.txt1 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 -
https://people.ast.cam.ac.uk/~rgm/wfcsur/int_ao.txt
https://people.ast.cam.ac.uk/~rgm/wfcsur/int_ao.txt1 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 -
Appendix C- Technical support & warranty
https://people.ast.cam.ac.uk/~rgm/cirsi/cirsi_pixel_ir_docs_19981101/appc.htm15 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.
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