Wonderful image Nik! No sign of McNeil's, but V1647 showing up nicely! Can I use it in a talk?

Thanks Nick. PM sent.

Stunning image Nick S.  Regarding McNeil's nebula, it looks like the red smudge is the faintly illuminated northern lobe.  As far as I can see V1647 is still invisible even in this deep image. (South up...well it was taken from Chile!). Do you have some idea of the limiting magnitude you are reaching?
Mike.

Thanks Mike. I've done a quick check using Maxim DL and the limiting magnitude seems to be about 19. I've got a more-knowledgeable friend checking this for me so the value might be revised.

A good friend of mine, Eric Watkins, used Astrometrica to carry out a detailed photometric analysis of the three 600-second sub-exposures that make up the Luminance component of the image. His conclusion is that the stacked file has reached magnitude 23 and possibly 24, so way deeper than my naïve estimate of mag 19! 

Thanks Nick, that's really useful feedback.  A lovely image and a useful magnitude limit placed on V1647 Ori at the same time.

McNeil's nebula is only visible when V1647 is 'bright' (mag. 15 ish)...so it won't be back again any time soon! (That's my theory anyway...).

Thanks, Mike