Sun, 09/13/2020 - 23:48
AAVSO Alert Notice 720 announces an observing campaign on the cataclysmic variable SS Cyg. Please see the notice for details and observing instructions.
To stay informed about this campaign, particularly about the date of its ending, subscribe to this forum thread (option 1 under Subscribe below) - see feedback from the PI, comments and questions from observers, and notes from AAVSO HQ. Add a post yourself - join in the discussion about this interesting target!
Many thanks, and Good observing,
Elizabeth O. Waagen, AAVSO HQ
This star is easy to do with the AAVSO's network of robotic telescopes, but no one at this time has submitted a proposal to monitor SS Cyg. The network is available to all AAVSO members, so this might be an opportunity to try it out. See
and note the "proposal section", giving you a link and information on how to fill out the form.
Dr. Mariko Kimura is asking for V and R band photometry of SS Cyg. Finding the V band magnitudes for the comp stars is possible from the Field Photometry report of VSP. But where does one look up the R band data for the comp stars?
Thanks. Elizabeth. ;-)
When requesting a chart, check off the box for R at the very bottom of the chart request form. The R mags (as well as the V) will be shown in the photometry table of the chart that is created.
Hi, I'm Mariko Kimura and the PI of this campaign.
Thanks to the AAVSO and VSNET campaigns, I found that the X-ray irradiation of the secondary star may be weak by the Rc-band data. However, I do not confirm this by the V-band data. The data may be not enough or the orbital profile becomes complex for some reasons. The X-ray flux is gradually increasing still now and I continue to perform multi-wavelength observations of this target. The current mean V-band magnitude is ~10.8.
I just checked V band data for SS Cyg and see strong variations up to 0.6 within a very few minutes for some observers. Example: Data from last night from observer PSD show values between 10.4 and 10.9 within a period of only 7 minutes. But the incertainty for every data point is given below 0.05. This would mean that the variation has significance. Is this truly the case?
I think those variations are real. I observed SS Cyg in the normal quiescent state in the past and similar variations were detected. This behavior may be typical in U Gem-type dwarf novae. These variations probably come from the bright spot at the outer disk rim or the visinity of the white dwarf.
I am behind on analyzing my data but I have variations in B and V of 0.5 mag over a 10 min period from 9/2/2020.
An outburst started today. 1.5 hours ago I saw SS Cygni at mag. 9.4.
Just began a series of images for SS Cyg, which confirm a mag ~9.3.
Last night I spent more than 6 hours on it, just began reducing the images, Data will be uploaded in an hour or two.
As you know, SS Cyg is now in outburst. Maybe this time is not the case, but sometimes this source shows precursor outbursts. The precursor outburst is always a long outburst. The mechanism of this precursor is still unknown, so the observations at the rising part to the light maximum is important.
SS Cyg - +8.60 mag, 19.42 UT, 22.09 2020 Binocular DO 10x50 Silver, Smardzowice,Poland
Should we keep imaging? I have clear skies coming so can jump on this for a few hours this week before I start on V392 Per.
Sorry for my slow response. I was checking the optical and X-ray recent activity of SS Cyg. This source started fading at both wavelengths. I don't know how this source behaves in near future, but I will continue monitoring until the X-ray flux returns back to the normal one and then stop observations. Thanks a lot for your cooperation. If the X-ray state has changed, I'll let you know.