I have had a request for spectra of this star from Prof Subo Dong of the ASSASN team. This star was not thought to be variable but has brightened by suddenly by ~3 mag to ~ mag 12. I plan to try tonight but I have thin high cloud currently.
https://wis-tns.weizmann.ac.il/object/2018jsc
http://www.cbat.eps.harvard.edu/unconf/followups/J03005508+1802290.html
An image here
http://meineko.sakura.ne.jp/ccd/TCP_J03005508+1802290.jpg
Robin
An ALPY 600 spectrum in poor conditions (thin cloud) shows a blue continuum, weak H beta and gamma in absorption and no detectable H alpha
LISA spectrum, 4500 sec integration, very similar to Robin's above.
According to a recent email to the CBA group by Tonny Vanmunster reporting observation of superhumps, it is a probably an AM CVn type dwarf nova.
David