C/2020 F3 (NEOWISE) mit 135mm KB (HR_Maurer)

Celestial hemisphere: Northern · Constellation: Lynx (Lyn) · Contains: Solar system body or event

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C/2020 F3 (NEOWISE) mit 135mm KB

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C/2020 F3 (NEOWISE) mit 135mm KB

Finally i got it done (or it got me). This is a stack of the darkest 150 6s-subframes of the comet, taken around midnight on July 13/14.

Clearly visible in the dust tail are ray-like features, so-called "synchrones", pointing straight away from the nucleus. They are caused by lines of simultaneous released particles, dispersed by light pressure via size/mass ratio. Such lines form, when the dust ejection from the nucleus is not uniform, due to the nucleus' spin.

Image processing was a pain, not only because of the - originally 248 - many subframes, but also because of limited storage. I had to juggle the intermediate data back and forth, and carefully drain the recycle bin regularly. Next time i'll go for less but longer exposures.

Thanks to Tommy Nawratil for the hint!

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Final
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B

Description: new Postpricessing

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Samyang 135 f/2
Suburban Astrophotography
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Status	Advanced success
Started	...
Astrometry.net job	3681935
PixInsight job	UKAY2PXKLKZ517NI1IKXQN5C4B83QOM9
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	07h07m38s.6
RA (top/left)	07h51m28s.5
RA (top/right)	06h39m12s.7
RA (bottom/right)	06h26m10s.2
RA (bottom/left)	07h30m18s.8

Dec (center)	+49°18′35″
Dec (top/left)	+50°02′30″
Dec (top/right)	+54°52′36″
Dec (bottom/right)	+47°34′52″
Dec (bottom/left)	+43°17′55″

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C/2020 F3 (NEOWISE) mit 135mm KB

C/2020 F3 (NEOWISE) mit 135mm KB

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C/2020 F3 (NEOWISE) mit 135mm KB

C/2020 F3 (NEOWISE) mit 135mm KB

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