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  #21  
Old 03-10-2019, 08:55 AM
topheart
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Wow Greg!
The combo image is wonderful!
Cheers,
Tim
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  #22  
Old 03-10-2019, 01:06 PM
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Thanks for your observation.

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Wow Greg!
The combo image is wonderful!
Cheers,
Tim
Thanks Tim. The CDK data is quite detailed.

Greg.
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  #23  
Old 03-10-2019, 05:55 PM
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Yep, the revised version is lovely- subtle & diaphanous- well done!
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  #24  
Old 03-10-2019, 06:46 PM
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Echoing others - the new version is splendid

Wondering if any stars get elongated and some detail blurred in multi-year astro images
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  #25  
Old 04-10-2019, 08:58 AM
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Yep, the revised version is lovely- subtle & diaphanous- well done!
Thanks Andy. Its hard to beat aperture in good seeing conditions.

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Echoing others - the new version is splendid

Wondering if any stars get elongated and some detail blurred in multi-year astro images
Thanks Suavi.

Good point. I haven't found it to be an issue. The new higher accuracy PI integration tools sound worthwhile and worth investigating. I find CCDStack to sometimes not do the best job and sometimes it refuses to align images.

If there are subtle changes like you pack out the camera to handle tilt later but not in the original that possibly may affect it. Registar though I think would be hard to fool.
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  #26  
Old 04-10-2019, 02:19 PM
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Thanks Suavi.

Good point. I haven't found it to be an issue. The new higher accuracy PI integration tools sound worthwhile and worth investigating. I find CCDStack to sometimes not do the best job and sometimes it refuses to align images.

If there are subtle changes like you pack out the camera to handle tilt later but not in the original that possibly may affect it. Registar though I think would be hard to fool.
I was thinking more in terms of apparent star movement relative to us and gas expansion.
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  #27  
Old 06-10-2019, 08:48 AM
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I was thinking more in terms of apparent star movement relative to us and gas expansion.
I see. I have combined new and old sets
before and did not notice any issues there.
Greg
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  #28  
Old 06-10-2019, 10:09 AM
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I see. I have combined new and old sets
before and did not notice any issues there.
Greg
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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  #29  
Old 07-10-2019, 07:45 PM
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It's a nice composition Greg with lovely colour. Little refractor like stars too.
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  #30  
Old 07-10-2019, 08:51 PM
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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.
The distances are so vast that even if the relative speeds are large the angular shift would be tiny.

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It's a nice composition Greg with lovely colour. Little refractor like stars too.
Cheers Paul. When the tilt is dialled in the stars do become quite pinpoint which is great for an astrograph.

Greg.
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