Quote:
Originally Posted by Slawomir
Thank you for confirming that Greg.
I did a quick calculation for the Helix, and it would take about 40 years to have the nebula expand by one pixel when imaging at 1 arcsec per pixel. It would be even less movement for the most of the objects located further away. So we should be able to integrate data collected even a few decades apart without any noticeable effect on the sharpness of the image, maybe with an exception for the few really fast moving stars.
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The distances are so vast that even if the relative speeds are large the angular shift would be tiny.
Quote:
Originally Posted by Paul Haese
It's a nice composition Greg with lovely colour. Little refractor like stars too.
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Cheers Paul. When the tilt is dialled in the stars do become quite pinpoint which is great for an astrograph.
Greg.