[vsnet-alert 24555] BC UMa likely superoutburst!

Mon Aug 17 16:48:59 JST 2020

BC Ursae Majoris  (UGWZ)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=37185

Patrick Wiggins reports that BC UMa is very bright (tonight)
in CCD images that were taken by him on my request (in the
course of our CV monitoring programme). The outburst is
also noticeable in an image taken the night before.
Observations (observer Wiggins, measurer Schmeer):
UMABC 20200805.234 <170CR  (P. Wiggins and P. Schmeer)
UMABC 20200816.228  127:CR (P. Wiggins and P. Schmeer)
UMABC 20200817.222  128CR  (P. Wiggins and P. Schmeer)

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/light_curves/3aca5f40-d46d-4734-b411-3ea0c7837549

In the ZTF light curve (via LASAIR) a brightening from
gmag. 18.2 on 2020 June 9 to gmag. 17.8 on July 13 can
be seen: https://lasair.roe.ac.uk/object/ZTF18aalprzj/

Time-resolved photometry is encouraged.

Clear skies,
Patrick