Estimates magnitude CCD-C (AUDE) SN2000dn 20001101.987 171CR BRU SN2000dr 20001102.014 174CR BRU SN2000cx 20001114.890 174CR ROY Observer:Laurent BRUNETTO (BRU);Observatory 139 (Antibes)France; LX200 254mm F/D=6.4;Camera HI-SIS22;software:Prism . comparison with stars of seq USNO Odd Trondal Observer Rene Roy (ROY):Observatory 627 Blauvac (France);TN 256mm F/D=4.7 Kaff400:software PRISM and Qmips32; 2000cx,comparison stars U148,158,145 Jean Marie Llapasset Obs 635 Perpignan (France) http://perso.wanadoo.fr/jm.llapasset/ http://aude.geoman.net/observation/SN/sn.html