NGC 5985, 5982, 5981, Draco Triplet, OSC, 31 May-1 Jun 2016 (David Dearden)

Celestial hemisphere: Northern · Constellation: Draco (Dra) · Contains: NGC 5981 · NGC 5982 · NGC 5985

NGC 5985, 5982, 5981, Draco Triplet, OSC, 31 May-1 Jun 2016

Very nice conditions; much better than when I tried two weeks ago and got such poor results I did not post them. I'm also using the Fringe Killer filter rather than the UHC-S. I'm not sure whether it's the darker sky, the filter, or both, but this image turned out WAY better than the attempt 2 weeks ago. Autofocus was still a bit iffy so I shut it off. I had a lot of differential flexure again. Probably the only solution will eventually be to get an off-axis guider setup, but for now I'll just live with it. I especially like the face-on spiral of this group. It almost looks 3-dimensional.

Date: 31 May-1 June 2016

Subject: NGC 5985, 5982, 5981, Draco Triplet

Scope: AT8IN + HPS Coma Corrector

Filter: Baader Planetarium Fringe Killer (UV-IR cut)

Mount: EQ-6 (EQMOD)+PEC

Guiding: Orion ST-80 + Antares 0.5x focal reducer + DSI Ic + PHD 2.6.1.1 (Win 7 ASCOM)

Camera: DSI IIc, no chiller CCD 11 °C

Acquisition: Sequence Generator Pro 2.5.1.14 with Nebulosity 4.0.4 ASCOM camera driver

Exposure: 35x600 s

Stacking: Neb 4, bad pixel map, bias included, 33 flats, match histograms, trans+rot align, Deep Sky Stacker 1.5σ κ-σ stack.

Processing: StarTools 1.4.316: Crop; Wipe; Develop: 80.53%; HDR:Equalize; Color:Scientific, 148% saturation; Deconvolute: 2.5 pix; Track: Smoothness 87%, 6.2 pix; Magic, shrink 1 pix. Photoshop CS6 + Astronomy Tools: Deep space noise reduction; Levels; Levels with layer mask; lncrease star color; Less crunchy more fuzzy with layer mask to preserve dust lane sharpness; Astroframe.

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Status	Advanced success
Started	...
Astrometry.net job	1106002
PixInsight job	9Y2RVC4YAWMWJN4JZW1J4PEU99QK62P1
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	15h38m35s.10
RA (top/left)	15h40m16s.94
RA (top/right)	15h36m59s.30
RA (bottom/right)	15h36m52s.96
RA (bottom/left)	15h40m09s.65

Dec (center)	+59°20′19″.1
Dec (top/left)	+59°29′27″.0
Dec (top/right)	+59°30′24″.8
Dec (bottom/right)	+59°11′01″.5
Dec (bottom/left)	+59°10′06″.4

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NGC 5985, 5982, 5981, Draco Triplet, OSC, 31 May-1 Jun 2016

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NGC 5985, 5982, 5981, Draco Triplet, OSC, 31 May-1 Jun 2016

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