M 4 with a photobomb by a spider (Chris Jensen)

Celestial hemisphere: Southern · Constellation: Scorpius (Sco) · Contains: HD147491 · HD147592 · HD147649 · HD147743 · M 4 · NGC 6121

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M 4 with a photobomb by a spider

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M 4 with a photobomb by a spider

M4 with a spider photo bomb. M4 is approximately 7,200 light-years away, making it the closest globular cluster to the Solar System. It has an estimated age of 12.2 billion years. This is 4.5 hours of data shot on 9th May.
The stacked images showed a faint line right through the centre of the image and an arch of light in the red channel. I didn't pick up on the faint line until I completed preprocessing and saw it in each channel. Going back to blink each sub again, and sure enough, the very faint line was in every sub. The arch is in the red channel only.
Checking my scope, I found a daddy long legs spider has built a web inside the scope with part of it right on the mirror. The line is part of the web that is in focus, and the arch is part of the web a little bit off the mirror.

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Southern Hemisphere Astro
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Star Clusters

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Status	Advanced success
Started	...
Astrometry.net job	7692634
PixInsight job	PRJ3S4BVHUB52CAXZ6X6W456HQQ3R8DX
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	16h23m39s.214
RA (top/left)	16h21m16s.738
RA (top/right)	16h23m36s.512
RA (bottom/right)	16h26m02s.246
RA (bottom/left)	16h23m41s.664

Dec (center)	-26°31′23″.28
Dec (top/left)	-26°13′18″.44
Dec (top/right)	-27°08′04″.74
Dec (bottom/right)	-26°49′23″.24
Dec (bottom/left)	-25°54′45″.20

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M 4 with a photobomb by a spider

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