Egress Pause !
We were probably all considering the eclipse would soon reach the fourth contact and the campaign is over ! But after a steep brightning at 0.01 mag / day for about 30 days the system has decided a pause ! Now for a week the slope is even at zero mag/day in average...
A couple of observers have also noted an unusual variance/variability of the brightness of epsilon during the rise. That variability is now more obvious within that pause. I have first suspected the sky condition, as usual, but it was unclear it was the reason, other stars of my survey (a dozen) were not showing at all the same variability. Recently I decided to change my process, instead of making one or two long series of 40 shots I made shorter series of 10~15 every 20~30 minutes during about two hours or more whether the sky condition permits.
After analysis of the data my conclusion is the system should have a short period oscillation of about 0.04 mag amplitude. This period seems stable for a least 6 days at 0.0462 ( 1 h 6.5 min) This oscillation has nothing to do with the OOE which the period is much longer (~63 days)
That short period oscillation was probably the cause of the variability seen during the past weeks. The first conclusion is our shots should cover a period of one hour, at least, to get a result not compromized by the undersampling of that variance / oscillation.
The study of the OOE and this possible short period oscillation after the eclipse is also an interesting subject I plan to cover.
Keep observing !
Clear Skies !