[vsnet-alert 24173] (fwd) Re: ER UMa: negative superhump state?

Taichi Kato tkato at kusastro.kyoto-u.ac.jp
Tue Apr 14 10:39:24 JST 2020

(fwd) Re: ER UMa: negative superhump state?

From: Graeme Coates <graeme at chromosphere.co.uk>
Date: Tue, 14 Apr 2020 02:34:16 +0100

I observed ER UMa over a period of approx 3.5 hrs (in fairly poor
conditions) between 20:00UT and 23:30UT - my data indicates it is around
mag 13.4V with an amplitude of approx 0.13 magnitudes.

Data is in BAA VSS and AAVSO for further analysis.


On Sat, 11 Apr 2020 at 07:03, Taichi Kato <tkato at kusastro.kyoto-u.ac.jp>

> ER UMa: negative superhump state?
>    In this season, ER UMa shows only three normal
> outbursts between superoutbursts.  It may be
> exhibiting negative superhumps.  The object is
> currently in superoutburst.

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