V827 Cep: likely SU UMa with a fainter counterpart
I found a likely superoutburst in the ATLAS data. The amplitude looks too small and the true counterpart is likely a fainter one near the USNO object.
20180611.5803 19.220c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180613.5623 18.838o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180613.5716 18.555o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180613.5819 18.780o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180613.5928 18.679o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180615.5517 16.381c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180615.5615 16.407c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180615.5715 16.408c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180615.5821 16.381c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180617.5371 16.434o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180617.5477 16.470o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180617.5589 16.442o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180617.5701 16.476o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180619.5601 16.599o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180619.5698 16.468o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180621.5233 16.791o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180621.5348 16.727o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180621.5454 16.600o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180621.5572 16.681o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180623.5324 16.919o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180623.5422 16.889o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180623.5527 16.983o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180623.5637 16.939o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180625.5490 17.118o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180625.5600 17.011o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180625.5703 17.020o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180625.5809 17.133o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180627.2902 17.282o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180627.5884 17.325o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180627.5994 17.425o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180627.6110 17.284o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180627.6224 17.561o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180629.4774 18.266o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180629.4880 18.518o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180701.5259 18.639o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180701.5291 18.814o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180701.5380 18.757o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20180701.5473 18.675o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505))