[vsnet-alert 26014] ZTF21abilubd: a large-amplitude CV candidate

[Kenta TAGUCHI]

Using my private scraping system,

I've just found ZTF21abilubd out as a large-amplitude (> 6 mag in r) CV 
candidate from the public ZTF data.


Lasair: https://lasair.roe.ac.uk/object/ZTF21abilubd/ 
<https://lasair.roe.ac.uk/object/ZTF21abilubd/>

ALeRCE: https://alerce.online/object/ZTF21abilubd/ 
<https://alerce.online/object/ZTF21abilubd/>

MARS: https://mars.lco.global/?objectId=ZTF21abilubd 
<https://mars.lco.global/?objectId=ZTF21abilubd>


According to ALeRCE, the position is (RA, Dec) = (18:32:30.39, +18:41:22.6)


Last non-detections by ZTF:

g > 19.685 on 2021-06-27.288 (ZTF, 'difference mag' via ALeRCE)

r > 19.7916 on 2021-06-28.384 (ZTF, 'difference mag' via ALeRCE)


First detections by ZTF:

r = 15.563 on 2021-06-29.333 (ZTF, 'difference mag' via ALeRCE)

g = 15.078 on 2021-06-30.290 (ZTF, 'difference mag' via ALeRCE)


The result of ASAS-SN Sky Patrol: 
https://asas-sn.osu.edu/sky-patrol/coordinate/bfa6750f-b87f-48d1-a7f0-2fbeb706169d 
<https://asas-sn.osu.edu/sky-patrol/coordinate/bfa6750f-b87f-48d1-a7f0-2fbeb706169d>

It looks a nearby star is contaminated, but two possible past outbursts 
may have been recorded in 2015, 2018.


There is a possible counterpart in PS1 data: r = 21.83, i = 21.60, y = 
15.96, z = 15.80

It's position is (RA, Dec) = (18:32:30.39, +18:41:22.5)

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 
<https://www.minorplanetcenter.net/cgi-bin/checkmp.cgi>).

-- 
________________________________________________________________
  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