M65, M66, NGC 3628, The Leo Trio (Worst Coma Ever!), 3 Apr 2013 (David Dearden)

Celestial hemisphere: Northern · Constellation: Leo (Leo) · Contains: M 65 · M 66 · NGC 3623 · NGC 3627 · NGC 3628

M65, M66, NGC 3628, The Leo Trio (Worst Coma Ever!), 3 Apr 2013, David Dearden

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M65, M66, NGC 3628, The Leo Trio (Worst Coma Ever!), 3 Apr 2013

The Leo Trio is an easy find with the Telrad, especially when using a focal reducer; all 3 galaxies are visible with 1 s exposures in the imaging scope. I have the extender on with the focal reducer to make it 0.5x, and this is clearly too much: I see severe coma and vignetting (like the worst I have ever seen; I've tried to clean it up in software, but still...). I'll need to shoot this again without the extender. Some very light wind gusts. CCD at 5.5 °C (6 V 1.5 A).

Amazing! I just found that my image picked up the Type II supernova SN2013am in M65. It's in the center of the disk, on the left side of M65 (bottom left galaxy) in this image and is barely visible, but it is there.

Date: 3 Apr 2013

Subject: M65, M66, NGC 3628, the Leo Trio

Scope: AT8IN + Antares 0.5x focal reducer with additional 1 cm spacer on the front of the camera

Filter: None

Mount: CG-5 (Synta motors)

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

Camera: DSI IIc (chiller, T = 5 °C)

Acquisition: Nebulosity 3.1.4, no dither

Exposure: 52x300 s

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

Processing: StarTools 1.3 Crop, Develop, Wipe:Gradient & Color cast, Develop, Contrast, HDR:Reveal Core, Deconvolute: 3 pix, Track, Repair:Redistribute Core=Avg, Life:Isolate, Magic:Shrink & Tighten (multiple cycles), Life:Moderate with 500% saturation. CS6 Astronomy Tools increase star color, Smudge tool to fix remaining coma, AstroFrame.

Final
Original
B

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Astrometry.net job	6606242
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M65, M66, NGC 3628, The Leo Trio (Worst Coma Ever!), 3 Apr 2013

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