[vsnet-alert 24445] DDE 19 outburst

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

This dwarf nova in Cepheus is in outburst according to ZTF Lasair (Masci et
al., 2019) and ASAS-SN data (Shappee et al., 2014 Kochanek et al., 2017).

DDE 19
  20200715.3536  18.08r  ZTF
  20200716.2941  16.36g  ASAS-SN
  20200716.2953  16.59g  ASAS-SN
  20200717.5381  15.47g  ASAS-SN
  20200717.5408  15.50g  ASAS-SN
  20200718.4145  15.08r  ZTF
  20200718.4768  15.11g  ZTF
  20200719.4261  15.16g  ASAS-SN
  20200719.4287  15.10g  ASAS-SN

Position: 00 38 37.40 +79 21 37.5

ZTF light curve: https://lasair.roe.ac.uk/object/ZTF18abwfkvl/
ASAS-SN light curve over last 100 days:
https://asas-sn.osu.edu/light_curves/8441ad3f-aaab-48c4-8f0f-67d22346c007

Looks like a starting superoutburst.

Eight superhump maxima were observed by Bill Stein during three nights in
2011. According to Kato et al., 2013 (PASJ Vol. 65, 1, 23) period of
superhumps is just below the period gap: 0.09121 d (2.19 hr).

Denis Denisenko
http://scan.sai.msu.ru/~denis/VarDDE.html