Ganymede

Contains: Solar system body or event

Ganymede

My friend Rafael Compassi has noticed that whenever he catches the Galilean satellites the tendency to appear dark central spots in Callisto and Ganymede is frequent. This led us to wonder if these spots could be an inherent consequence of capture, or even some processing defect, since they usually always manifest themselves in these two satellites.

I do not know what conclusion to take, what I noticed in this photo, for example, is that the spot is not uniform, it can be seen that the region near the Dendera crater (NASA right photo) is darker than the regions around it and This was also evident in the photo I took. In the right limbo at 3am there is the Osiris crater which is quite clear, and with a certain effort you can see that in my photo this region is also a bit clearer.

The truth is that at the moment I am working at the limits of resolution for the telescope and the camera that I have because of the seeing that I have had available, seeing this one, that, unlike what many may think, is far from being an Atacama.

In these conditions, anything recorded in something so small can be celebrated as a victory, and brings hope that on a night of really good seeing one can have a pleasant surprise!

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Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
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Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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