M20, Trifid Nebula, UHC-S, 17 Jul 2014 (David Dearden)

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: B85 · M 20 · NGC 6514 · Trifid nebula

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M20, Trifid Nebula, UHC-S, 17 Jul 2014

I synched on Antares, farther from the target than usual, but the goto was right on. Though the sky started out quite clear, there was also a lot of smoke in the air. The night was warm; the camera started at 26 °C but the chiller at 2.5 A pulled it down to 15 °C. The other problem was intermittent light wind gusts, which made the guiding problematic. The subframes definitely got worse when the Moon rose, but M20 is quite low on my horizon so I kept all the subs I could. All things considered, I'm happy with the image.

Date: 17 Jul 2014

Subject: M20, Trifid Nebula

Scope: AT8IN

Filter: Baader UHC-S

Mount: CG-5 (Synta motors, PicGoto Simplificado)

Guiding: 9x50 Finder/Guider + DSI Ic + PHD 2.3.0 (Win 7 ASCOM)

Camera: DSI IIc chiller at 2.50 A, 15 °C

Acquisition: Nebulosity 3.2.0, no dither

Exposure: 37x180 s

Stacking: Neb 3, bad pixel map, bias included, normalize first, trans+rot align, 1.5 SD stack.

Processing: StarTools 1.3.5.279 Crop; Wipe:Color & brightness 75%; Develop 82.80%; HDR:Reveal DSO core; Color:Scientific, 200%; Deconvolute auto mask 2.6 pix; Life:Moderate; Track RNC 2.00%; Magic:Shrink 1 pix; CS6 Astronomy Tools Healing brush; Increase star color; Less crunchy more fuzzy; Astro Frame.

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Status	Advanced success
Started	...
Astrometry.net job	319042
PixInsight job	RYOOVLPTPUWE23WG8XIFY5Y5Y0UC94E9
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	18h02m24s.31
RA (top/left)	18h01m32s.58
RA (top/right)	18h01m39s.33
RA (bottom/right)	18h03m16s.42
RA (bottom/left)	18h03m08s.79

Dec (center)	-22°56′36″.4
Dec (top/left)	-22°43′02″.1
Dec (top/right)	-23°11′19″.5
Dec (bottom/right)	-23°10′13″.4
Dec (bottom/left)	-22°41′54″.10

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M20, Trifid Nebula, UHC-S, 17 Jul 2014

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M20, Trifid Nebula, UHC-S, 17 Jul 2014

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