[vsnet-alert 4184] RX J0909.8+1849 is a new eclipsing dwarf nova !!

["Tonny Vanmunster" <Tonny.Vanmunster@advalvas.be>]

Hi colleagues,

I started observing RX J0909.8+1849 at CBA Belgium Observatory, using the 0.35-m f/6.3 telescope with unfiltered ST-7 CCD, at about 20h08m UT. I turned on my "real-time" light curve facility, allowing me to follow the evolution of the light curve of this object as closely as possible. My first excitement came when I noticed the development of hump-like features (with a small amplitude). I'm not sure yet if these are real superhumps.

This however was just the beginning of the "show". A little later, the variable started a fast fading - entering a deep eclipse - to recover about 28 minutes afterwards. You could call it a UG+E detection in "real-time".

Here are some first details :

Eclipse depth : 2.5 magnitudes
Eclipse duration (estimate looking at light curve) : 28 minutes
Mid-eclipse (estimate looking at light curve) : 2000 Feb 11.8845 UT

I'll continue monitoring this object for the rest of the night (evidently).

What an exciting hobby !

Best regards,
Tonny

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