Dear friends,

Using my private system scraping MARS ( https://mars.lco.global ), I've just found ZTF21aceijig out as a CV candidate from the public ZTF data. It's amplitude is > ~ 6.0 mag (assuming the limiting mag of PS1-g is 21.6). (I'm sorry if someone has already discovered and reported it elsewhere.)

Lasair: https://lasair.roe.ac.uk/object/ZTF21aceijig ALeRCE: https://lasair.roe.ac.uk/object/ZTF21aceijig MARS: https://mars.lco.global/?objectId=ZTF21aceijig

According to ALeRCE, the position is (RA, Dec) = (01:49:59.397, +54:39:27.24)

Last non-detections by ZTF: g > 19.6426 on 2021-09-23.40 (ZTF, 'difference mag' via ALeRCE) r > 19.9288 on 2021-09-23.44 (ZTF, 'difference mag' via ALeRCE)

Last non-detection by ASAS-SN: g > 17.124 on 2021-09-27.5628629

First detections by ZTF: g = 15.694 +/- 0.036 on 2021-09-28.33 (ZTF, 'difference mag' via ALeRCE) r = 15.865 +/- 0.032 on 2021-09-28.41 (ZTF, 'difference mag' via ALeRCE)

The result of ASAS-SN Sky Patrol: https://asas-sn.osu.edu/sky-patrol/coordinate/2f155ab7-61ac-4b06-9fb7-68d40f... There are no possible counterparts recorded in the PS1 mean object catalog.

No known minor planets are found by the Minor Planet Checker ( https://www.minorplanetcenter.net/cgi-bin/checkmp.cgi ).

Best Regards and Clear Skies, Kenta