Sirius B ......planetary camera and stacking...
Posted 23 February 2014 - 02:06 AM
I tried capturing a few hundred frames of avi's with my planetary ASI 120 colour camera but do not know how best to stack them to bring out the B star.
I use Autostakkert2 or Registax for stacking...can someone give me some tips on how to use these on Sirius?
Posted 23 February 2014 - 02:28 AM
No secret about my method of capture processing of these images. The first stage involves the capture of an AVI movie (30-40 seconds) in a similar way for planetary imaging . For very narrow or unbalanced double stars it is preferable to use long focals of at least 4000 mm ( f/30 or higher, my typical f/45 ). Second stage: processing of the movie. A simple automatic alignment does not produce this result, but an image of confusion which still serve as luminance. Proceeds a second image obtained by extracting individual frames that align manually with excellent RegiStax. This operation is slower and requires a lot of patience: it is not easy to determine what is the optimal alignment in a picture that is very often deformed by seeing. The brain is able to recognize this point better than any algorithm that makes a difference and is perfected with practice. The image obtained is added with the automatic image alignment. At this apply various wavelets, denoise, etc.. If these procedures are been made correctly, you will get an image similar to this one.
Quote can be found here: http://www.astrobin.com/75887/#c31224
Here's some of his work:
Sirius B: http://www.astrobin.com/60905/0/
Rigel B: http://www.astrobin.com/75887/0/
He even discovered an Arcturus B using this method.
Arcturus B: http://www.astrobin.com/73195/C/
Hope this helps.
Posted 23 February 2014 - 02:50 AM
I suspect that Sirius would be a more difficult task, probably not possible with my AT72ED. Being an astrophotographer (mainly) I often turn my camera toward double stars and globular clusters when the moon is too bright or if the skies are too hazy to try any other subjects.
Posted 23 February 2014 - 05:47 AM
Not sure about "extracting individual frames that align manually".....sounds very tricky.
Posted 04 March 2014 - 05:27 AM
North is approximately downwards, the primary focus of C11 is slightly pulled out at about f/11.5, camera ASI120MC. The stack of 4700 images using AutoStakkert.
Posted 04 March 2014 - 05:39 PM
Can easily see B here
Posted 04 March 2014 - 07:10 PM