Io / Ganymede / Callisto (25 September 2023) (rdk_CA)

Contains: Solar system body or event

Io / Ganymede / Callisto (25 September 2023)

Acquisition type: Lucky imaging

Io / Ganymede / Callisto (25 September 2023)

Acquisition type: Lucky imaging

This image shows an unusual configuration of three of Jupiter's moons in late September 2023. Ganymede and Callisto are easily visible to the left of Jupiter. In addition, looking closely, you can also see Io hidden near the bottom of the Southern Equatorial Belt. It shadow grazes the cloud-tops of Jupiter (just barely visible at right side). Also visible is the South Polar Red Spot.

For this image, I acquired the data with my ZWO ASI 585 camera (gain: 309, exposure time: 16.1 ms). It was possible to obtain four 90 s captures (about 5000 frames each) of Jupiter before Io's shadow started to disappear at Jupiter's eastern limb. (I should have woken up earlier to catch it sooner!) I stacked the best 30% of approximately 20000 frames I captured during this time using AutoStakkert! 3, and then performed sharpening in Registax (with final adjustments using Photoshop).

Overall, the seeing conditions were reasonable for this image. The air was not quite steady enough to resolve much detail on Ganymede and Callisto, but after post-processing and WinJuPos de-rotation, it was possible to reveal fair amount of structure in the cloud belts of Jupiter and the darkened poles of Io are clearly visible.

Wishing all of you clear skies!

Please note: The following tables are updated every 24 hours.

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	Distinct awarded users	Total awarded images
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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
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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
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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.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
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.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

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PixInsight job	n/a
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Io / Ganymede / Callisto (25 September 2023)

Io / Ganymede / Callisto (25 September 2023)

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Io / Ganymede / Callisto (25 September 2023)

Io / Ganymede / Callisto (25 September 2023)

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