[vsnet-alert 21475] DDE 51 outburst

[Denis Denisenko]

Dwarf nova in Lacerta DDE 51 is detected in outburst for the first
time in three months of regular monitoring with the Open University's
Autonomous Robotic Telescope (0.35-m COAST).

DDE 51
  20170922.0862  <190CV   ART
  20170928.1251  16.52CV  ART  Outburst!

Reference star: 155 (V=15.461)
AAVSO chart: https://www.aavso.org/apps/vsp/chart/X21004CKE.png

Position (J2000.0): 22 38 22.5 +42 35 57
VSX entry: https://www.aavso.org/vsx/index.php?view=detail.top&oid=474733
Range: 15.7: - <19.4 V

PanSTARRS Catalog gives the following mean magnitudes for the variable:
g=18.79(0.22) r=20.27(0.04) i=19.77(0.05) z=19.69(0.04) y=19.30(0.07)

g magnitude is apparently affected by some outburst(s) in PanSTARRS data.

There is another star 3" to the SE of DDE 51 with PanSTARRS magnitudes:
g=20.19(0.02) r=19.46(0.01) i=19.14(0.01) z=19.01(0.02) y=18.92 (0.01)

Animation of Blue Palomar plates (outburst in 1952, quiescence in 1995):
http://scan.sai.msu.ru/~denis/DDE51-POSS-Blue-anim.gif

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