[vsnet-alert 25911] ZTF21abcnlpj: a large-amplitude CV candidate

[Kenta TAGUCHI]

Using my private scraping system, I've just found ZTF21abcnlpj out as a 
large-amplitude CV candidate from the public ZTF data.
Lasair: https://lasair.roe.ac.uk/object/ZTF21abcnlpj/
ALeRCE: https://alerce.online/object/ZTF21abcnlpj/
MARS: https://mars.lco.global/?objectId=ZTF21abcnlpj

According to ALeRCE, the position is (RA, Dec) =(17:52:01.13, +49:22:46.6).

Last non-detections:
r > 20.1521 on 2021-05-23.4468 (ZTF, 'difference mag' via ALeRCE)
g > 16.364 on 2021-05-25.2194 (ASAS-SN)

First detections by ZTF:
r = 15.152 on 2021-05-27.3673 (ZTF, 'difference mag' via ALeRCE)
g = 14.904 on 2021-05-27.4520 (ZTF, 'difference mag' via ALeRCE)

This is the result of ASAS-SN Sky Patrol: 
https://asas-sn.osu.edu/sky-patrol/coordinate/0cad21a4-f45b-40b4-ba76-c439dd8ffe0d
It looks no past outbursts are recorded.

There is a possible red counterpart in PS1 data: r = 21.47, i = 20.13, y 
= 19.82, and z = 19.96.
It's position is (RA, Dec) =(17:52:01.14, +49:22:46.2).
g magnitude is not recorded in PS1 mean object catalog.

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

Since r is brightened by 6.32 mag and g is by ~ 8 mag (assuming PS1 
limiting g ~ 23 mag),
I think it is a large-amplitude CV candidate.

Best Regards and clear skies,
Kenta
-- 
________________________________________________________________
  田口 健太　(TAGUCHI, Kenta)
  京都大学大学院理学研究科宇宙物理学教室
  (Department of Astronomy, Graduate School of Science, Kyoto University)
kentagch at kusastro.kyoto-u.ac.jp <mailto:kentagch at kusastro.kyoto-u.ac.jp>
  09090536980