[vsnet-alert 25859] ASASSN-20eq: 2020 superoutburst with rebrightenings

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

Following [vsnet-alert 25852]. Taichi Kato wrote:

>    According to the ZTF data, this object showed
> multiple rebrightenings and fading tail without superoutburst.
> Very strange behavior.  Extreme case of an AM CVn-type object?

Position: 17 35 00.45 +25 36 54.8

ZTF Lasair data (Masci et al., 2019):
https://lasair.roe.ac.uk/object/ZTF20aazcyda/

ATLAS forced photometry server (Tonry et al., 2018) has additional points
in the early part of 2020 outburst that show the fading in the middle of
outburst typical for AM CVn-type dwarf novae:
http://scan.sai.msu.ru/~denis/ASASSN-20eq-2020-SO-ATLAS.gif

Selected photometry from ATLAS database (Tonry et al., 2018):

ASASSN-20eq
  20200508.5841  19.9o  ATLAS
  20200510.5525  15.82o ATLAS  Start of outburst
  20200510.5702  15.82o ATLAS
  20200512.4454  16.10o ATLAS
  20200512.4579  16.14o ATLAS
  20200514.4745  17.22o ATLAS
  20200514.4878  17.38o ATLAS
  20200516.4820  19.52o ATLAS  Dip in the middle
  20200516.5502  19.69o ATLAS
  20200518.5211  16.13c ATLAS  Return to maximum
  20200518.5416  16.10c ATLAS
  20200520.3757  16.75o ATLAS
  20200520.4554  16.79o ATLAS
  20200522.5442  18.84c ATLAS
  20200522.5534  18.74c ATLAS

Definitely a superoutburst.

Denis Denisenko

P.S. Dear colleagues! When announcing the interesting behavior, outburst or
a call for observations of known variables, please report the coordinates
of the objects. That will save others from unnecessary search in Vizier or
VSX. Thank you for your time and understanding.