Timing for Anuket (Sah) collapse. - NOT perihelion

This is an extension of the changes noted in this post:

http://marcoparigi.blogspot.com.au/2016/06/more-on-rockfall-area.html

And

http://marcoparigi.blogspot.com.au/2016/06/rockfall-in-anuket-sah-region.html

These changes were thought more likely to have occurred during the time of greatest activity, in mid to late 2015, but the evidence points to a far later collapse.

Image of region in January 2015 

Image in December 2014 for verification of ridge shape:

Image in February (18th) 2016 below: Main rockfall not happened.

Following image shows the Sah area on the February 21st 2016 but angle is not ideal:

Image on March 1st 2016 clearly shows rockfall. 

The conclusion from these images is that the rockfall happened no earlier than 18th of February 2016, and no later than the 1st of March 2016.  OSIRIS WAC and NAC images could narrow this down considerably.

Image Credits

FOR NAVCAM
Copyright ESA/Rosetta/NAVCAM – CC BY-SA IGO 3.0
To view a copy of this licence please visit:
http://creativecommons.org/licenses/by-sa/3.0/igo/
FOR OSIRIS
Credits: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DyASP/IDA/
All lines and dotted annotations by Marco Parigi