NSV 4168 superoutburst YYYYMMDD(UT) mag observer 20200208.7253 <145c (Yutaka Maeda) 20200220.6705 129cG (Yutaka Maeda) 20200222.7074 132cG (Yutaka Maeda) 20200223.6510 133cG (Yutaka Maeda)