[vsnet-alert 25357] Re: MASTER OT J172758.09+380021.5 outburst (since Feb. 8)

[Patrick Schmeer pasc1312-aavso@yahoo.de via vsnet-alert]

 The current outburst is expected to be a normal one (as
recent superoutbursts were observed 2020 November 8-14
and 2021 January 8-15).
 
Quote (Taichi Kato, see VSNET message below):
"Currently, the supercycle appears to be ~70 d."
 
Regards,
Patrick
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     Am Dienstag, 9. Februar 2021, 11:40:01 MEZ hat Patrick Schmeer pasc1312-aavso at yahoo.de via vsnet-alert <vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp> Folgendes geschrieben:  
 
  MASTER OT J172758.09+380021.5 (UGSU, EI Psc star?)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=359271
 
Zwicky Transient Facility (ZTF) light curve and data:
https://lasair.roe.ac.uk/object/ZTF18aaiytds/
 
Recent ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S
and Kochanek et al. 2017PASP..129j4502K) light curve and data:
https://asas-sn.osu.edu/sky-patrol/coordinate/366ccedb-a673-4369-8728-7db8a373b623
 
The current outburst was also detected by Maeda-san (and
reported two hours ago, see vsnet-outburst 26607):
http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-outburst/26607
 
Clear skies,
Patrick
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    Am Donnerstag, 12. November 2020, 01:31:02 MEZ hat Taichi Kato <tkato at kusastro.kyoto-u.ac.jp> Folgendes geschrieben:  
 
 MASTER OT J172758.09+380021.5 outburst

  According to the ZTF data, this object is not an ordinary
SU UMa star (see vsnet-alert 23720, 24112).

2018 Mar-Apr. superoutburst: two post-superoutburst rebrightenings
  and a slow fading tail like a WZ Sge star.
2018 July-Aug. superoutburst: deep dip in the middle of
  a superoutburst.
2019 Jan.-Feb: long rebrightening.

  Currently, the supercycle appears to be ~70 d.

  Thorstensen's spectrum did not show enhanced helium lines.
This object probably needs to be studied in detail.
(Could it be a WZ Sge star mimic or EI Psc-type object?)

  YYYYMMDD(UT)  mag  observer
  20201023.1179 17.890zr  (Zwicky Transient Facility Lasair (Masci+ 2019))
  20201028.1181 17.977zr  (Zwicky Transient Facility Lasair (Masci+ 2019))
  20201101.1589 16.600zr  (Zwicky Transient Facility Lasair (Masci+ 2019))
  20201104.0811 18.009zr  (Zwicky Transient Facility Lasair (Masci+ 2019))
  20201111.1389 14.521zr  (Zwicky Transient Facility Lasair (Masci+ 2019))