IC4592 The Blue Horsehead with IC4601 (Jim Lindelien)

Celestial hemisphere: Southern · Constellation: Scorpius (Sco) · Contains: 10 ome02 Sco · 12.23 · 13.31 · 14 nu. Sco · 14.88 · 15.53 · 266 Aline · 4 psi Oph · 40 Harmonia · 7 chi Oph · 713 Luscinia · 80 Sappho · 9 ome01 Sco · B40 · B41 · B43 · IC 4592 · IC 4601 · Jabbah · LBN 1113 · LBN 1114 · LBN 1115 · LBN 1119 · LDN 1717 · LDN 1719 · LDN 1721 · LDN 1752 · Ophiucus · The star νSco · The star χOph · And 6 more.

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IC4592 The Blue Horsehead with IC4601

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IC4592 The Blue Horsehead with IC4601

IC4592 The Blue Horsehead reflection nebula in Scorpius in LRGB.

This is something of a bad luck object in that each night I try to image it, really bad weather or at least wind, dust and haze roll in.

Anyhow, this image is the accumulated data from a March session in Costa Rica (with a travel mount), and another session in May in the US on my main mount.

Not knowing quite how to get the best result given the dim dust and bright stars, I "threw the kitchen sink" at it via a number of camera gains and exposure times, and stacked them all together. No real plan here, I just stacked raws not too affected by weather.

64x30sec gain 0

64x30sec gain 240

15x240sec gain 132

17x120sec gain 240

29x240sec gain 240

Camera 1x1; cooling -10C; FWHM 3.2px. Applied bias, darks, flats from library.

Rather than reduce the glorious star field, I elected instead to enhance the visibility of the nebulosity.

I used StarNet++ to pull out a starless luminance layer, enhanced the structural details of the nebulosity, then blended this back into the OSC's RGB image via PixelMath (max operator).

Drizzle integrated at 2x for post processing then cropped to 16:9 aspect ratio and downscaled to standard UHD resolution.

The main mount ran unguided at King rate; and the compact 30mm f/4 ZWO guidescope with an ASI290MM Mini handled the travel mount.

Observing sites and SQM data:

Finca Alma de la Selva, UNESCO Savegre Biosphere Reserve, Costa Rica (SQM ~21.5)

Pahrump, NV USA (SQM 20.57)

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Objects of the South - negative declination only
The OSC Club (One Shot Camera)
Cooled Color Cams
WO Star 71

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Status	Advanced success
Started	...
Astrometry.net job	3599220
PixInsight job	WFQ6HUB6ZKARZK0BP6DD9FW5IWFB5X7N
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	16h18m39s.97
RA (top/left)	16h06m11s.27
RA (top/right)	16h30m49s.80
RA (bottom/right)	16h30m55s.15
RA (bottom/left)	16h06m46s.80

Dec (center)	-19°39′18″.6
Dec (top/left)	-21°10′19″.2
Dec (top/right)	-21°19′04″.5
Dec (bottom/right)	-18°04′57″.5
Dec (bottom/left)	-17°56′33″.7

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IC4592 The Blue Horsehead with IC4601

IC4592 The Blue Horsehead with IC4601

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IC4592 The Blue Horsehead with IC4601

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