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Contains:  M 106, NGC 4258, NGC 4248
Getting plate-solving status, please wait...
M106, OSC (UHC-S), 1-2 Apr 2016, 





    
        

            David Dearden
M106, OSC (UHC-S), 1-2 Apr 2016

M106, OSC (UHC-S), 1-2 Apr 2016

Technical card

Resolution: 800x652

Dates:April 2, 2016

Frames: 29x600"

Integration: 4.8 hours

Avg. Moon age: 23.99 days

Avg. Moon phase: 30.88%

Astrometry.net job: 1024742

RA center: 184.632 degrees

DEC center: 47.308 degrees

Pixel scale: 2.124 arcsec/pixel

Orientation: 92.275 degrees

Field radius: 0.304 degrees

Locations: Mapleton Lateral Observatory, Mapleton, Utah, United States

Description

I still can't get Sequence Generator Pro plate solving to work! I'm frustrated by this, but my gotos have been good enough, even after meridian flipping, that I've been able to find the target in my guider camera and re-center manually. I suspect the problem is probably is related to the non-square pixels of my cheap imaging camera, but I'll keep investigating because I really want to solve this. Anyway, I didn't get M106 framed quite right, but this is still a much better image than last year's effort, which came out way too yellow. This image suffered from some differential flexure. This was also my first attempt to use EQMOD AutoPEC. It seemed to help during the time I was watching, but I did have some strange RA oscillations toward the end of the run after I’d gone to bed.

Postscript: I think I just solved my plate solving problem! Suspecting the non-square pixels as the cause of the problem, I used the pixel size in microns from my camera and put in 8.3/8.6 = 0.965 as the PlateSolve2 aspect ratio parameter. Bingo! Plate solve succeeded on the 1st region. I look forward to trying this out tonight. I think I had actually tried this before, but I think I had it inverted and used 8.6/8.3.

Date: 1-2 Apr 2016
Subject: M106
Scope: AT8IN
Filter: Baader Planetarium UHC-S
Mount: EQ-6 (EQMOD) + AutoPEC
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 9.5 °C
Acquisition: Sequence Generator Pro 2.4.3.25 with Nebulosity 4.0.4 ASCOM camera driver
Exposure: 29x300 s
Stacking: Neb 4, bad pixel map, bias included, 33 flats, match histograms, trans+rot align, Deep Sky Stacker 1.5σ κ-σ stack without drizzle.
Processing: StarTools 1.4.305: Crop; Wipe; Develop: 82.93%; HDR:Optimize; Color:Scientific, 249% saturation; Deconvolute: 2.8 pix; Track: Smoothness 75%, 4.5 pix; Magic, shrink 1 pix. Photoshop CS6 + Astronomy Tools: Deep space noise reduction; Increase star color; layer-masked local contrast enhance; layer masked less crunchy more fuzzy; Astroframe.

Comments

Author

dvdearden
David Dearden
License: None (All rights reserved)
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M106, OSC (UHC-S), 1-2 Apr 2016, 





    
        

            David Dearden