IC 443, Jellyfish Nebula, 13 Mar 2013 (David Dearden)

Celestial hemisphere: Northern · Constellation: Gemini (Gem) · Contains: 7 Gem) · Gem A · IC 443 · Praepes (η Gem · Tejat Prior · The star Propus

IC 443, Jellyfish Nebula, 13 Mar 2013, David Dearden

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IC 443, Jellyfish Nebula, 13 Mar 2013

Despite high clouds that made Propus hard to see, I found the Jellyfish Nebula easily tonight by sighting the Telrad on Propus. I'm trying 300 s subframes; perhaps I should have gone longer. Once again got a late start due to competing activities tonight. It's a warmer evening, and the CCD is at 14 °C. This is a difficult object for me because it is relatively dim and Propus is bright. I threw out a lot of subframes where clouds brightened the background and wrecked the contrast. Given the less-than-optimal conditions, I’m reasonably happy with the overall result.

Date: 13 Mar 2013

Subject: IC 443, Jellyfish Nebula

Scope: ST80+Antares 0.5x telereducer

Filter: Baader UHC-S

Mount: CG-5 (Synta motors)

Guiding: 9x50 Finder/Guider + DSI Ic + PHD 1.14.01

Camera: DSI IIc (no chiller, T = 14 °C)

Acquisition: Nebulosity 3.1.4, no dither

Exposure: 24x300 s

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

Processing: StarTools 1.3 Develop, Contrast, HDR:Equalize, Sharp, Deconvolute, Wipe:Gradient, Develop, Track, Magic:Shrink (2x), Magic:Tighten, Life:Isolate. CS6 Astronomy Tools increase star color, layer masking to debloom the star, levels (darken), AstroFrame.

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Status	Basic success
Started	...
Astrometry.net job	6652989
PixInsight job	n/a
PixInsight queue size	n/a
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