[vsnet-alert 23827] MGAB-V270 aka ZTF18abihypg rising again

[Denis Denisenko d.v.denisenko@gmail.com via vsnet-alert]

In [vsnet-alert 23770] I have reported an outburst of this AM CVn-type
candidate in Cepheus on Dec. 09.909 UT. However, the star has quickly
faded after that. The follow-up monitoring with Open University's
COAST telescope shows it to be on the rise again.

MGAB-V270
  20191201.9869  <185CV   COAST
  20191209.9093  16.09CV  COAST  Outburst
  20191212.9044  <185CV   COAST
  20191226.8957  <185CV   COAST
  20191228.9028  <185CV   COAST
  20191229.8809  17.01CV  COAST  Rising

The last superoutburst to 15.3m in ZTF data had a precursor (or rather
a normal outburst) 20 days before it. ZTF DR2 light curve:
http://scan.sai.msu.ru/~denis/MGAB-V270-ZTF-DR2-LC.gif

If Dec. 09 outburst was a similar precursor, the star should go into a
superoutburst now. Follow up observations are strongly encouraged!

Note the peculiar shape of the 2018 superoutburst:
http://scan.sai.msu.ru/~denis/MGAB-V270-superoutburst.gif

Denis Denisenko