Photoelectric and CCD observations of classical novae and related objects. V723 Cas JD hel.24... V B U R Observatory- Device- Observer 51105.515 12.73 13.21 - 12.230 Cr-CCD7-Sh 51108.458 12.55 13.11 - 12.110 Cr-CCD7-Sh 51119.18 12.73 13.18 - 12.300 Cr-CCD7-Sh 51121.4335 12.749 13.158 11.960 - Cr-L-Me 51121.4411 12.806 12.973 12.074 - Cr-L-Me 51124.2317 12.867 13.114 12.142 - Cr-L-Me 51124.2383 12.842 13.129 12.138 - Cr-L-Me 51130.2024 12.763 12.956 12.068 - Mo-ShV-G 51130.2186 12.870 13.072 12.057 - Mo-ShV-G 51130.2311 12.826 13.073 12.113 - Mo-ShV-G 51130.2471 12.799 13.023 12.129 - Mo-ShV-G 51130.2591 12.868 13.012 12.039 - Mo-ShV-G 51133.2063 12.883 13.109 12.203 - Mo-ShV-Sh,G n=2 51134.2289 12.878 13.142 12.227 - Mo-ShV-Sh,G n=2 V4334 Sgr 51007.3626 11.452 13.159 13.914 - Cr-ShV-Q 51007.3765 11.436 13.324 - - Cr-ShV-Q 51008.3772 11.423 13.160 - - Cr-ShV-Q 51008.3862 11.419 13.236 14.32 - Cr-ShV-Q 51009.3862 11.343 13.170 - - Cr-ShV-Q 51013.3363 11.466 13.152 14.298 - Cr-ShV-Q 51013.3492 11.479 13.198 14.085 - Cr-ShV-Q 51013.3590 11.471 13.174 14.154 - Cr-ShV-Q 51014.3502 11.441 13.147 - - Cr-ShV-Q 51014.3620 11.453 13.136 - - Cr-ShV-Q 51014.3704 11.469 13.120 - - Cr-ShV-Q 51015.3302 11.659 13.579 - - Cr-ShV-Q 51017.3377 11.504 13.238 - - Cr-ShV-Q 51017.3474 11.638 13.507 - - Cr-ShV-Q 51018.2986 11.582 13.254 - - Cr-ShV-Q 51018.3102 11.605 13.367 14.581 - Cr-ShV-Q 51018.3239 11.620 13.323 14.504 - Cr-ShV-Q 51018.3373 11.614 13.406 14.504 - Cr-ShV-Q 51018.3516 11.595 13.367 14.408 - Cr-ShV-Q 51019.2940 11.626 13.336 - - Cr-ShV-Q 51020.3688 11.496 13.53 - 9.526 Cr-CCD7-G 51022.3100 11.579 - - 9.554 Cr-CCD7-G 51025.3417 11.747 13.78 - 9.688 Cr-CCD7-G 51028.3172 11.835 14.0 - 9.790 Cr-CCD7-G 51029.3049 11.903 13.74 - 9.814 Cr-CCD7-G N Oph 1998 Comparison star Henden 8, check star Henden 16. 51013.3534 14.75 - - 14.43 Cr-CCD7-G,Sh 51013.3568 14.79 - - 14.43 Cr-CCD7-G,Sh 51015.2951 15.08 - - 14.86 Cr-CCD7-G,Sh 51015.2980 15.09 - - 14.80 Cr-CCD7-G,Sh 51016.2921 - - - 14.79 Cr-CCD7-G,Sh 51016.2968 15.11 - - 14.79 Cr-CCD7-G,Sh 51019.3047 15.30 - - 15.04 Cr-CCD7-G,Sh 51021.3726 15.61 - - 15.21 Cr-CCD7-G,Sh 51024.2920 16.07 - - 15.47 Cr-CCD7-G,Sh (I=15.29) This rapid decay suggest that the star undergoes DQ Her type minimum. Observatory: Cr - Crimean station of SAI, 125-cm, 60-cm and 38-cm reflectors; Mo - Sternberg Institute, Moscow, 70-cm reflector; Device: CCD7 - CCD ST-7 with filters; L - UBV photometer by V.M.Lyuty; ShV - UBV photometer by S.Yu.Shugarov and I.M.Volkov; Observers: G - V.P.Goranskij, Me - N.V.Metlova, Q - A.V.Kusakin, Sh -S.Yu.Shugarov. Vitaly Goranskij, Sternberg Astronomical Institute, Moscow, Russia.