[vsnet-alert 24112] MASTER OT J172758.09+380021.5: EI Psc-type candidate, frequent superoutbursts, currently in outburst

[Taichi Kato]

MASTER OT J172758.09+380021.5: EI Psc-type candidate, frequent superoutbursts, currently in outburst

   In [vsnet-alert 23720] by Kojiguchi-san,

> According to ZTF data and Gaia data, this object has the absolute magnitude
> in quiescence of 9.3 mag, the Gaia color of 0.36 mag, superoutburst amplitudes
> of 4 -- 5 mag and recurrent time of 100 d. In addition, this object shows the
> type A rebrightening or temporarily fading.

   According to the ZTF data, this object showed a superoutburst
with two rebrightenings in 2018 March-April.  Furthermore,
There was a superoutburst associated with type A rebrightening
or temporarily fading in 2018 July (superoutburst mentioned
in vsnet-alert 23720).  These two superoutbursts were only
four months apart!  This phenomenon may be analogous to
TCP J21040470+4631129 (Tampo et al., PASJ submitted).

   MASTER OT J172758.09+380021.5 have apparently shown many
superoutbursts and normal outbursts in ZTF data since then.
The object is currently in outburst.  Probably all outbursts
of this object deserve time-resolved photometry.

  YYYYMMDD(UT)   mag  observer
  20200317.7391 <146c  (Yutaka Maeda)
  20200318.7654 <152c  (Yutaka Maeda)
  20200319.7084 <158c  (Yutaka Maeda)
  20200320.7007 <157c  (Yutaka Maeda)
  20200322.7897 <132c  (Yutaka Maeda)
  20200328.4879 14.479zg  (Zwicky Transient Facility Lasair (Masci+ 2019))
  20200328.5132 14.624zr  (Zwicky Transient Facility Lasair (Masci+ 2019))