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Ganymede detail RGB

Technical card

Resolution: 3518x3518

Date:April 20, 2019

Time: 03:31

Frames: 50000

FPS: 55.00000

Focal length: 9755

CMI: 6.00

Seeing: 4

Transparency: 7

Locations: Home property, Wattle Flat, NSW, Australia

Data source: Backyard


With very good seeing the detail on Ganymede for each colour was exceptional. For each colour channel I took each of the images into a series of layers in Photoshop. I quality assessed these rejecting the poor images. I then resampled to get a larger image so that they could then be aligned. I have found previously that the image scale is such that the movement of 1 pixel is not quite fine enough to get the images to align well. By resampling this was much easier. I then stacked the images before taking them out to RegiStax for a small wavelet sharpen. When doing the moons, I’ve not done that before, but it occurred to me that after stacking with WinJUPOS I normally do a small further sharpen when doing the planets. The integration of multiple images allows this. I then took them back to Photoshop before aligning each colour to produce the RGB colour composite.

This the largest moon in the solar system and bigger than the planet Mercury, only subtended 1.55 arc seconds today, given that it is something like 700 million kms away! Given my scope’s optical resolution is 0.34 arc secs, this means that there are only ~ 21 optically resolvable areas on the planet. It is really stretching the capability of the equipment and processing to see this level of detail especially through the Earth’s atmosphere.



Niall MacNeill
License: None (All rights reserved)


Ganymede detail RGB, 


            Niall MacNeill