EE Cep observing campaign 2020-2021

American Association of Variable Star Observers (AAVSO)
Mon, 02/24/2020 - 20:19

AAVSO Alert Notice 700 announces an observing campaign underway on the long period eclipsing binary EE Cep. Please see the notice for details and observing instructions.

Many thanks, and Good observing,

Elizabeth O. Waagen, AAVSO HQ

Royal Astronomical Society of Canada (RASC)

Is this one for photometry only, or can they use visual observations as well? I did visual for the last one. Please advise.

American Association of Variable Star Observers (AAVSO)
Visual observations are welcome

Hi Patrick,

Yes, visual observations are welcome. I should have said so in the Alert Notice. Photometry is needed for Kobicki's analysis, but visual obsevations are welcome to supplement the photometry and to provide the light curve when photometry is not available. Thank you in advance!

Good observing,


Campaign 2020/21

Thank you very much for observing the eclipse of EE Cephei 2020. The observations will be used for publication and for my PhD thesis. All observers who took part in the campaign will be included in a publication.


However, I am asking you to continue monitoring the brightness of the EE Cephei star (once a week is enough). This will allow us to prepare for the phenomenon that will take place around ϕ = 0.2 of the orbital phase, 20th of May 2021 (JD 2459354). In the previous epochs at this point of the orbital period, an increase of the near-infrared Ic flux was observed (Pieńkowski et al. 2020).


I hope that our joint work will allow us to guess what is really happening in the EE Cep system.


At this point, data from all over the world are still being sent to me, and I will start standardizing them in about a month or two. Maybe I will contact some of you.

Best regards

Dariusz Kubicki