ATOJ277.8818+42.0389 = SDSS J183131.63+420220.2: ER UMa + Z Cam + AM CVn star The object is currently in superoutburst. Time-resolved photometry is encouraged! YYYYMMDD(UT) mag observer 20230416.5063 17.429c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230416.5090 17.372c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230416.5125 17.388c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230416.5377 17.471c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230418.5797 17.419c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230418.5797 17.420c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230418.5829 17.443c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230418.5829 17.451c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230418.6051 17.408c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230418.6051 17.410c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230418.6232 17.391c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230420.4230 16.973zg (ZTF Alert DC mag (Masci+ 2019)) 20230420.4746 17.352zr (ZTF Alert DC mag (Masci+ 2019)) 20230422.4469 17.063zg (ZTF Alert DC mag (Masci+ 2019)) 20230422.5163 17.192c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230422.5190 17.177c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230422.5222 17.166c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230422.5338 17.138c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230424.4703 17.780zg (ZTF Alert DC mag (Masci+ 2019)) 20230424.5161 17.908c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230424.5189 17.852c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230424.5220 17.842c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230424.5319 17.880c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230424.6286 17.594c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.5161 17.495c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.5184 17.507c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.5216 17.502c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.5273 17.581c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230426.4308 17.156zg (ZTF Alert DC mag (Masci+ 2019)) 20230426.4682 17.559zr (ZTF Alert DC mag (Masci+ 2019)) 20230426.5082 17.266c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230426.5100 17.370c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230426.5132 17.317c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230426.5204 17.235c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230426.6302 17.807c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230502.4908 18.398o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230502.5273 18.764o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230503.4260 17.421zr (ZTF Alert DC mag (Masci+ 2019)) 20230504.3179 17.112o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230504.3300 17.058o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230504.3318 17.073o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230504.3395 17.340o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230505.5031 17.350o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230505.5058 17.229o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230505.5103 17.268o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230505.5158 17.287o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230506.5970 17.258o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230506.6002 17.351o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230506.6153 17.240o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230506.6192 17.283o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230508.4337 17.312o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230508.4677 17.293o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230508.4833 17.343o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230508.4945 17.276o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230508.5163 17.340o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230508.5181 17.329o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230508.5262 17.389o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230508.5316 17.341o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230511.4679 17.046zg (ZTF Alert DC mag (Masci+ 2019)) 20230512.5983 17.516o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230512.6033 17.459o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230512.6063 17.518o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230512.6158 17.530o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230513.5383 17.401o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230513.5428 17.391o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230513.5714 17.365o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230513.5969 17.472o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.3608 17.029zg (ZTF Alert DC mag (Masci+ 2019)) 20230514.4129 17.501zr (ZTF Alert DC mag (Masci+ 2019)) 20230514.4855 17.215c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.4926 17.203c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.4960 17.247c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.5121 17.213c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230516.3095 18.119o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230516.3132 18.294o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230516.3220 18.172o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230516.3378 18.030o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230517.4047 18.079zr (ZTF Alert DC mag (Masci+ 2019)) 20230518.5521 17.582o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230518.5553 17.615o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230518.5619 17.637o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230518.5718 17.701o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230519.4528 18.134zr (ZTF Alert DC mag (Masci+ 2019)) 20230521.3666 19.024zg (ZTF Alert DC mag (Masci+ 2019)) 20230521.4234 19.500zr (ZTF Alert DC mag (Masci+ 2019)) 20230522.4786 18.957o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230522.4804 18.917o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230522.5040 18.598o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230522.5067 18.760o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230522.5072 18.661o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230522.5095 18.697o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230522.5135 18.621o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230522.5342 18.828o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230524.4516 17.181o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230524.4538 17.205o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230524.4916 17.171o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230524.5201 17.063o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230526.4481 17.222o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230526.4763 17.247o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230526.4798 17.294o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230526.4849 17.294o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230527.4943 17.285o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230527.4961 17.285o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230527.4992 17.293o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230527.5266 17.336o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230528.4264 17.333o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230528.4502 17.354o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230528.4532 17.448o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230528.4781 17.279o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230530.4162 17.295o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230601.4238 17.356o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230601.4527 17.399o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230601.4555 17.460o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230601.4605 17.373o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230605.4302 18.071o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230605.4406 17.848o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230605.4455 17.969o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230605.4516 18.171o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230607.4648 18.438o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230607.4865 18.475o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230607.4919 18.434o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230607.4948 18.364o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230609.4511 18.753o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230609.4588 18.706o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230609.4854 18.884o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230611.4227 17.482c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230611.4280 17.322c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230611.4318 17.349c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230611.4417 17.266c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230615.4441 17.050c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230615.4464 16.987c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230615.4491 16.956c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230615.4787 17.013c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230616.4380 17.077c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230616.4410 16.997c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230616.4461 17.080c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230616.4678 17.035c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230617.4240 17.103c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230617.4268 17.060c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230617.4334 17.114c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230617.4432 17.038c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230619.4344 17.093c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230619.4371 17.109c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230619.4421 17.072c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230619.4528 17.109c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230621.4317 17.084c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230621.4331 17.108c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230621.4358 17.125c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230621.4449 17.166c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230622.3975 17.152c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230622.4227 17.325c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230622.4262 17.102c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230622.4517 17.166c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230628.4653 17.490o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230628.4689 17.418o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230628.4835 17.421o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230628.4895 17.485o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230629.4615 17.457o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230629.4642 17.325o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230629.5011 17.445o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230629.5129 17.382o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230701.4337 17.494o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230701.4630 17.279o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230701.4658 17.386o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230701.4713 17.351o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230704.4266 18.011o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230704.4293 18.110o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230704.4660 18.139o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230704.4688 18.077o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230704.4725 18.354o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230704.4730 18.183o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230704.4784 18.173o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230704.4990 18.098o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230705.4245 17.420o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230705.4273 17.486o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230705.4323 17.548o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230705.4674 17.622o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230705.4678 17.478o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230705.4706 17.632o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230705.4994 17.685o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230705.5298 17.651o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230706.4264 18.281o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230706.4609 18.284o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230706.4636 18.268o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230706.4677 18.327o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230706.4688 18.407o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230706.4711 18.375o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230706.5066 18.337o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230706.5120 18.723o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230707.4324 17.762o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230707.4669 17.683o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230707.4699 17.663o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230707.4750 17.823o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230709.4205 18.620o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230709.4237 18.364o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230709.4305 18.429o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230709.4406 18.532o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230711.4735 17.148o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230711.4768 17.083o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230711.4843 17.117o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230711.4973 17.145o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230712.4441 16.914c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230712.4477 16.919c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230712.4539 16.885c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021))