"Christmas Star" Conjunction 2020 (ken_and_sara)

Contains: Solar system body or event

"Christmas Star" Conjunction 2020

Acquisition type: Lucky imaging

"Christmas Star" Conjunction 2020

Acquisition type: Lucky imaging

After a practice image session the night before, it was obvious that atmospheric dispersion was going to be a major problem. Although I recently got my hands on the ZWO ADC unit, I did not want to risk lack of experience with that gadget on a once-in-a-lifetime event. And so I shot monochrome through red green and blue filters.

Imaged using a 2.5x Powermate.

Notes: since I had a manual filter wheel, I should have paid more attention to which filter was in place during acquisition. Otherwise you end up with a lot of monochrome videos without other clues about which filter was in use. It just took a bit of sorting out, when logical file names would have been easier.

I was a bit surprised to see slight vignetting with this setup - it occurred to me later that I was shooting with the 1.25" filters instead of the larger 36mm filters that I'm used to.

I noticed a number of people have made the mistake of framing the field star HIP 99314 which happened to be in line with Jupiter's other moons, perhaps thinking this star was the fourth moon of Jupiter. In fact Ganymede was in front of Jupiter (you can *just* make it out in my photo as a dark spot) and so only three moons were out of transit as shown.

All in all, a difficult shoot with a small time window to acquire it - fortunately the weather was clear here in San Diego and the seeing was much better than the night before.

SDAA AISIG Group

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	Distinct awarded users	Total awarded images
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	Image of the day	Top pick	Top pick nominations	Total submitted
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	Image of the day	Top pick	Top pick nominations	Total submitted
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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.
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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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"Christmas Star" Conjunction 2020

"Christmas Star" Conjunction 2020

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