This SU UMa type dwarf nova in Perseus is in outburst on the latest image from Open University's COAST telescope installed on Teide, Tenerife. COAST Mark III is 0.42-m f/6.8 CDK17 Dall-Kirkham with FLI ProLine KAF-09000 CCD. MASTER OT J042609.34+354144.8 20211122.3276 16.38r ZTF Lasair 20211212.9034 16.12CV COAST 20211213.4163 16.30o ATLAS (Tonry et al.) 20211221.5314 16.15o ATLAS 20211223.5042 15.84o ATLAS 20211225.3864 16.28o ATLAS 20211226.3844 16.50o ATLAS last observartion before outburst 20211227.9386 15.93CV COAST 20220103.0572 13.29CV COAST Outburst! ZTF Lasair real-time data https://lasair.roe.ac.uk/object/ZTF17aabuvss/ has not been updated since 2021 Nov. 22 (MJD=59540). The light curve from Zwicky Transient Facility (Masci et al., 2019) Data Release 8: http://scan.sai.msu.ru/~denis/J0426+3541-ZTF-DR8-LC.gif Light curve from ATLAS forced photometry server (Tonry et al., 2018): http://scan.sai.msu.ru/~denis/J0426+3541-ATLAS-LC.gif Note the long-term variations of the quiescent level. Fourth body in the system? Third body is apparently too far away (16.6" at 186 pc is about 3000 AU, or 100x Sun-Neptune distance) to cause perturbations on a few years time scale. Denis Denisenko