[BAA Comets] C/2014 Q2 ion tail development yesterday

[Nick James]

The tail of this comet changes dramatically from day-to-day and 
hour-to-hour. I've rescaled three images from yesterday taken by myself, 
Ian Sharp and Martin Mobberley to show this. You can see the result here:

http://www.nickdjames.com/Comets/2015/2014q2_tail_comparison_20150110.jpg

Can I take this opporunity to ask imagers to include field-of-view/scale 
and orientation info on their images. Without this very basic 
information it is difficult or impossible to compare images taken by 
different systems. It amazes me how many of the top imagers don't do 
this and leave us to guess. You know who you are...

Nick.