Jupiter / Io / Europa / Callisto (July 1, 2020) (rdk_CA)

Contains: Solar system body or event

Jupiter / Io / Europa / Callisto (July 1, 2020)

Acquisition type: Lucky imaging

My second attempt at Jupiter this summer, with the planet only 27 degrees above the horizon. I was dissatisfied with my previous effort last week, so I made some modifications to my setup which greatly improved the image quality. With the small pixel size of the IMX178 sensor (2.4 micron) I decided to not to use a Barlow lens. Imaging at f/10 versus f/20 allowed me to run at a much lower gain setting for the same 20 ms exposure time per frame. (For this QHY camera, I was able to reduce the gain to 8 at f/10 versus 22 at f/20.) This greatly reduced the noise in the individual frames. Based on some rough estimates, I was likely over-sampled in my previous images anyway.

I also noticed that the camera-side adapter on my flip mirror only had one locking screw (allowing for some camera tilt) and added quite a bit of length to the image path. I replaced this with a much more compact attachment with two locking screws, which was much more secure. Given Jupiter's low position in the sky, I spent some extra time getting the ADC well tuned. Of course, good seeing helps a lot -- it was about as good as it usually gets for my location.

For final processing, I acquired 12 videos, 90 seconds each (42,000 frames) and stacked the best 25% (10,500 frames.) The moons Io, Europa, and Callisto were also nearby on this evening. I imaged these using a longer exposure (100 ms) and added them into the image as a separate layer.

Apparent Size: 47.3 arcsec

Altitude: 27 degrees above horizon

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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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Unknown

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Astrometry.net job	n/a
PixInsight job	n/a
PixInsight queue size	n/a
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Jupiter / Io / Europa / Callisto (July 1, 2020)

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Image Index:

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Jupiter / Io / Europa / Callisto (July 1, 2020)

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