Comet C/2022 E3 ZTF processed to supress star trails (William Duane)

Contains: Solar system body or event

Comet C/2022 E3 ZTF processed to supress star trails

Comet C/2022 E3 ZTF. This image was guided on the comet head, causing the comet to be in focus, but causing the stars to trail as the comet moved over the 2 hours. The images which were assembled into this picture were taken over a 2 hour period from 2/15/23 9:15pm to 11:26pm.

This picture uses the same captured data as my other C/2022 E3 ZTF image, but it is processed differently to subdue the background star trails, and enhance the comet.

In order to suppress the star trails, Sigma Clip Data Rejection processing was done. Sigma Clip attempts to remove anything which is not present on all of the images stacked to create the picture. Normally it is used to remove things like satellite tracks crossing one of images - since the satellite track will not be on the other images, the Sigma Clip data reduction function will remove it from the final image. Another example are cosmic rays which randomly captured during each of the exposures. Sigma Clip will remove the cosmic ray noise since the cosmic ray hit does not appear on all images which are stacked to create the picture. See my other C/2022 E3 ZTF picture which has the star trails to see some cosmic ray strikes during the exposure.

In this picture, the Sigma Clip function attempts to remove the star trails because over the 2 hours the comet moves relative to the background stars. That means that the stars trails are in different locations on each of the 24 images used to create this picture. As a result, the Sigma Clip does not see them on all images and tries to supress them.

Comet images were captures with an Esprit80mm/flattener using a QHY183C camera running at -30s. 24x300s exposures.
Guiding was on comet's head.

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Status	Basic failed
Started	...
Astrometry.net job	7316178
PixInsight job	n/a
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Comet C/2022 E3 ZTF processed to supress star trails

Comet C/2022 E3 ZTF processed to supress star trails

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Comet C/2022 E3 ZTF processed to supress star trails

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