MGAB-V298 (AM CVn:) bright outburst Likely superoutburst. YYYYMMDD(UT) mag observer 20221120.3517 21.643zr (ZTF Alert DC mag (Masci+ 2019)) 20221121.7591 <171C (Masayuki Moriyama) 20221126.8861 <157C (Masayuki Moriyama) 20221201.3930 21.746zr (ZTF Alert DC mag (Masci+ 2019)) 20221218.7800 165C (Masayuki Moriyama)