Saturn 21 Apr 2023 - 24 min WinJ Composite (Seb Lukas)

Contains: Solar system body or event

Saturn 21 Apr 2023 - 24 min WinJ Composite

Acquisition type: Lucky imaging

Saturn 21 Apr 2023 - 24 min WinJ Composite

Acquisition type: Lucky imaging

First Saturn capture of 2023.

Taken around 6am local time on Sat 22 Apr. My usual courtyard location away from direct street lighting.. good to be back in that spot finally. Conditions are getting wintery in Canberra now with temperature dropping below 4 °C before sunrise.

Saturn's angular diameter is still very small with opposition four months away. The disk will grow by another 3" which should reveal more detail in the cloud bands. The ring system has tilted away from Earth revealing southern hemisphere that has not seen much sunlight for the past 14 years. It's amazing to see how strikingly blue it has become.

This view combines just over 4,000 frames derotated in WinJUPOS; 24 minute recording interval between 19:45 and 20:09 UTC. I've started the session one hour earlier but seeing was only fair with the planet below 40° altitude. Also noticed significant atmospheric dispersion with no ADC in imaging train. There was a double moon transit of Enceladus and Tethys, the latter casting a shadow on the southern edge of the planet at 19:00 UTC. I had a closer look and unfortunately there's too much noise in the raw data to resolve it.

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

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
Noctilucent clouds
Landscape

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.

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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Saturn 21 Apr 2023 - 24 min WinJ Composite

Saturn 21 Apr 2023 - 24 min WinJ Composite

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Saturn 21 Apr 2023 - 24 min WinJ Composite

Saturn 21 Apr 2023 - 24 min WinJ Composite

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