Marshall,
Changes in the appearance of the Crab Nebula are well known and not a new finding. There are some really cool Hubble Space Telescope animations showing ripples and waves propagating away from the pulsar region. The animation presented here was just for curiosity sake- I wondered if two images taken 9 years apart would show changes. As you point out there was alot of uncontrolled variables as these images were not captured specifically for this project. Nonetheless I do think that at least some of differences showing up are real ( I do think there is a suggestion of expansion at least). In addition the proper motion of the pair of stars in the lower left was a neat bonus as well!?
Thanks for the tip on using PIPP to create animations. I¡¯ll definitely look into that.?
Myron
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On Feb 22, 2025, at 7:37?AM, Karl via groups.io <kjatway@...> wrote:
?
Its always interesting when you can see changes in objects so many lys away .?
Karl
Dear RAC,? CAS, and friends,
A number of people had trouble viewing the animation I sent out showing changes in the Crab Nebula over 9 years. Heres another version saved as MP4 format. hopefully this will work better. I have a friend working on this video
also and im sure his final version will be very nice. Ill send that out when its ready. Note the high proper motion stars in the lower left of the image as they jump back and forth.
One image was obtained in 2016 and the other just a few weeks ago. Two different telescopes (Meade 12" LX-200 for 2016 image and a 10" R-C for 2025 image) and two different cameras ( ATIK 314E CCD for 2016 and QHY 294M Pro
for 2025 image). Not the best way to do it but 9 years is a long time! I have? thousands of MSRO images archived going back to 2015 as we save all the data. It might be interesting to create other animations using the old images- who knows what might show
up!
Myron Wasiuta- Mark Slade Remote Observatory
Myron Wasiuta