[vsnet-alert 25172] DDE 39 light curve (likely SU UMa star)

[Taichi Kato]

DDE 39 = 1RXS J040253.8+435553 light curve (likely SU UMa star)

Subject: [vsnet-outburst 26351] 1RXS J040253.8+435553 outburst

From: Jeremy Shears
Sent: 30 December 2020 14:08
To: baavss-alert at groups.io <baavss-alert at groups.io>; cvnet-outburst at groups.=
io <cvnet-outburst at groups.io>; vsnet-outburst at ooruri.kusastro.kyoto-u.ac.jp=
 <vsnet-outburst at ooruri.kusastro.kyoto-u.ac.jp>
Subject: 1RXS J040253.8+435553 outburst

I managed 2.5 hours of photometry on 1RXS J040253.8+435553 last night. Cond=
itions were poor with bright moonlight and lying snow, then clouded out.

This showed a smooth hump of amplitude ~0.4 mag , ave mag ~15.5C (see: http=
s://britastro.org/observations/observation.php?id=3D20201230_135723_c330db3=
0b1fe23c3). Not long enough to confirm/refute as a superhump, but the tenta=
tive period using CLEANest on Peranso ver 3 was ~0.089 d (~2.1 h).

Further observations encouraged.

Jeremy

===

ASAS-SN data:
https://asas-sn.osu.edu/light_curves/2ccb30a0-ba2e-4ef9-aeed-dd16ccc4b184

   The 2018 Jan. outburst also appears to be a superoutburst.

Recent data:

  YYYYMMDD(UT)   mag  observer
  20201226.3090 <16.204g  (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017))
  20201226.3103 <16.279g  (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017))
  20201226.3115 <16.370g  (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017))
  20201228.1606 17.667zr  (Zwicky Transient Facility Lasair (Masci+ 2019))
  20201229.823  157C  (Jeremy Shears)
  20201230.2586 15.571g  (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017))
  20201230.801  153C  (Jeremy Shears)