LDN 557 (RGB) (Linda)

Celestial hemisphere: Southern · Constellation: Serpens (Ser) · Contains: HD172029 · HD172048 · HD172135 · HD172234 · HD172366 · LDN 557 · LDN 558 · LDN 563 · PGC 202681

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LDN 557 (RGB)

Link: https://lindasastronomyadventures.space/?p=11658

Powered byPixInsight

LDN 557 (RGB)

Link: https://lindasastronomyadventures.space/?p=11658

My Summer of Darkness continues with LDN 557.

I wasn't able to find any reference data on this one. The one thing that stands out is how apparently arbitrary these catalog designations can be. The "boundaries" for LDN 557 don't really seem have any bearing on where the dark area ends. And a good chunk of LDN 559 is in the image though there isn't much dark nebula within that annotation circle. Maybe one day I'll understand how these designations are created but that day is not today.

Processing:
RGB:
channel combination
dynamic crop
DBE
blurXterminator
SPCC
GHS (GHS, linear, GHS)
starXterminator
noiseXterminator
Curves (contrast)
Convolution (there was a bit of walking noise -- need to increase my dither on this scope a bit and since thee stars essentially mask all the detail in the background it was safe to apply a mild blur)
GAME for mask with HT to reduce the two bright star halos
pixel math in stars (screen)

stars
unsharp mask (very mild sharpening)

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DSOC Ceravolo

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Status	Advanced success
Started	...
Astrometry.net job	8305654
PixInsight job	B53S5PLRGURWERXC2369SA5RF8QMK7ZT
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	18h38m49s.218
RA (top/left)	18h40m40s.504
RA (top/right)	18h36m55s.831
RA (bottom/right)	18h36m58s.870
RA (bottom/left)	18h40m42s.616

Dec (center)	-01°47′09″.29
Dec (top/left)	-01°24′41″.46
Dec (top/right)	-01°25′21″.80
Dec (bottom/right)	-02°09′34″.00
Dec (bottom/left)	-02°08′56″.15

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LDN 557 (RGB)

LDN 557 (RGB)

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LDN 557 (RGB)

LDN 557 (RGB)

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