IC1805 & IC1848 (pier6)

Mike,

Another nice image. This setup only requires a 2 panel mosaic to fit both in which is amazing. I do like the colours you have, makes a nice change from the usual 'Hubble palette' like ones, mine included!

Cheers,

Ray

This is a great image Mike as always with you, and so I congratulate you on it!

The heart and soul nebula taken on p6 is of interest to me as well but I'm having some difficulties with the stacking of frames. I always use BPP or the new weighted version but no matter how hard I try it just comes out very poorly. I just wondered if you could explain to me how you have stacked these files please. I am not very confident when it comes to manually stacking and my automated version tends to work well nearly every time we but something strange is going on here.


First of all it was really hard getting things to calibrate properly and then I discovered that pier 6 seems to have a new camera and therefore new flat frames and dark frames, hence why they would not align together properly. Anyway I stacked it all together,  but no matter what I did I could not get an image out of the final master light frame. Every time I extracted the background it just made the image incredibly messy and impossible to process further. It is a real shame because there is some very good quality data in there. It could be that I have done something wrong but I'm not really sure how or what... There were also quite a few light subs that were unusable but even with those removed I just could not get any further with it. Having processed quite a few images from pier 6 in the past I was surprised at what happened.

Anyway I hope this helps Mike and if you get a few moments perhaps you can point me in the right direction. I am not a technical person in any way shape or form so hopefully it is a simple solution. No rush or pressure.




Thanks so much.
Simon

Mike, 

I hope you don't mind my butting in here, I'm sure you have some useful input which you can add. I have a bit of time right now so I thought I'd assist straight away. 

Simon,

From my review of the data I ended up using 24 Ha, 35 O3 and 27 s2. A few of the Ha subs I used contain a bright artefact near the top right, but appeared to be eliminated during integration. It appeared in 3 frames before moving out of the frame. I'm used to seeing the effect of geosynchronous satellites, but whatever it was is pretty large.  
Some frames suffered from the gain not being set correctly and I eliminated those just in case they caused problems. Nine of the S2 frames were shifted, the mount slewed to a slightly different position, but I included those. 

Sorry for that wordy explanation, which is not really relevant I know. 

Date and time stamps of the ones I included. 

Ha
20200815:  021557 - 033924
20200816 thru 20200817: 231551 - 010948

I selected 20200815 030126 for the alignment reference frame. 

O3
20200812 thru 20200813 : 231753 - 003400
20200818 thru 20200819 : 234231 - 005823
20200819 thru 20200820 : 233915 - 003443

S2
20200815: 035209 - 043205
20200817:  014157 - 031332
20200818: 023819 - 035437

I hope that helps. If you decide to use those, there should be 24, 35 and 27 subs respectively. 

I did not use any flat frames, they appeared to make matters worse, and I used the -5 degrees darks as the older ones suffer from major light leak problems. That may well have been your issue. I ignored the warnings about incompatibility between the light frames and the master dark when running the script due to the temperature difference. 


Cheers, Ray 

Mike I see you changed the colour scheme since I last viewed it. Very nice. 

As always Ray, you are incredibly helpful and I am grateful to you for this. I'm not available at the moment to look at this, I am not around to do so, but I will endeavour to get onto this in the next few days. It is interesting because I found the -10 darks to not be very good as you have said, but it could be there is an issue with the flats, so I will look at that also. Either way you have provided me with the best lights and I will see where I get to. Thanks so much again. Simon   : )