The video "Crab Nebula computed Expansion 1950 - 2100" is based on 386 real images with a total integration time of 32 hours, recorded in the years 2008 - 2017.
A correlation algorithm programmed by myself has computed the movement of each single pixel (2073600) over time. For subpixel accuracy the correlation algorithm worked on enlarged images (50 MPixel each). The average accuracy of the proper motions of the stars is 0.009 arcseconds / year, this compares to the width of a hair at a distance of 2 km.
Based on these computed images some simple sciencitic calculations were done:
- the year and location of the supernova explosion
- the distance and actual size of the Crab Nebula.