Hemisphere:  Northern  ·  Constellation: Canes Venatici (CVn)  ·  Contains:  IC 4263  ·  IC 4278  ·  M 51  ·  NGC 5169  ·  NGC 5194  ·  NGC 5195  ·  NGC 5198  ·  Whirlpool galaxy
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A Lonely M51, 



    
        

            Linda
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Getting plate-solving status, please wait...
A Lonely M51, 



    
        

            Linda
Powered byPixInsight

Imaging telescopes or lenses: Stellarvue SV80-3SV

Imaging cameras: ZWO ASI1600MM Pro

Mounts: Sky-Watcher EQ6R-Pro  ·  Losmandy GM811G

Guiding telescopes or lenses: Stellarvue SV80-3SV

Guiding cameras: ZWO ASI178MM

Software: Pleaides Astrophoto PixInsight 1.8 Ripley  ·  PHD2  ·  Sequence Generator Pro

Filters: Astrodon Gen 2 Series I Luminance  ·  Astrodon Gen 2 Series I Green  ·  Astrodon Gen 2 Series I Blue  ·  Astrodon Gen 2 Series I Red

Accessory: Pegasus Astro Pocket Powerbox  ·  OAG  ·  ZWO Filterwheel EFW 7x 36mm  ·  Moonlite NiteCrawler WR30  ·  Dew-Not DN004 Dew Heater Strap  ·  Losmandy Lightweight Tripod  ·  Goal Zero Yeti 400


Dates:June 22, 2019June 23, 2019July 9, 2019

Frames:
Astrodon Gen 2 Series I Blue: 33x60" (33') (gain: 76.00) -20C bin 1x1
Astrodon Gen 2 Series I Blue: 16x60" (16') (gain: 76.00) -20C
Astrodon Gen 2 Series I Green: 50x60" (50') (gain: 76.00) -20C bin 1x1
Astrodon Gen 2 Series I Luminance: 212x20" (1h 10' 40") (gain: 76.00) -20C bin 1x1
Astrodon Gen 2 Series I Red: 47x60" (47') (gain: 76.00) -20C bin 1x1

Integration: 3h 36' 40"

Darks: 50

Flats: 25

Flat darks: 50

Avg. Moon age: 15.81 days

Avg. Moon phase: 64.84%


RA center: 13h29m53s.173

DEC center: +47°0905.18

Pixel scale: 1.621 arcsec/pixel

Orientation: 90.011 degrees

Field radius: 0.667 degrees

More info:Open 


Resolution: 2409x1728

Locations: Home, Broadlands, VA, United States

Data source: Backyard

Description

This is the first cut of an attempt at M51. M51 is a bit small for my 80mm F/6 refractor but is one of the few targets accessible at home this time of year, at least until fairly late in the short early summer nights.

It is only a total of three hours of data and poor blue has only 16 minutes. I'm hoping to supplement all channels on the next clear night but especially blue.

My goal was to preserve as much detail as I could while getting rid of as much noise as I could. I may have crossed the line on this but with more data I can hopefully be a bit gentler with it. The image is fairly heavily cropped

Processing steps:

Luminance:

Mure Denise

DBE

MLT (noise reduction)

HT

Each RBG:

Mure Denoise

then Channel Combination

RBG:

DBE

PCC

MLT (chrominance & luminance)

ArchsinhStretch

LRBG Combination

TGVDenoise

LHE

SCNR

Curves (contrast & saturation)

Dark Structure Enhance

Comments

Revisions

  • A Lonely M51, 



    
        

            Linda
    Original
  • Final
    A Lonely M51, 



    
        

            Linda
    C

C

Description: This version adds in the (mostly) missing blue data (now about an hour instead of just 16 minutes). I was hoping to get more luminance data but in my yard M51 is going behind a tree only an hour after twilight ends. I may not have much opportunity to get more. So, instead I combined the existing luminance with all the RGB subs. It seemed to help though I'd have preferred to get at least a couple hours more true luminance data. Processing was a bit less aggressive on this version: Mure Denoise Channel Combination for RBG Dynamic Crop (RBG & L) DBE (RBG & L) PCC (RBG) HT (RBG & L) LRBGCombination LHE (mask for just the galaxy) CT (color saturation) TGV Denoise (Luminance & Chrominance) MLT (mild sharpening) HT (to bring down black level) This had much less noise reduction than the last version. It doesn't really stand up for pixel peeping but the illusion of sharpness and detail seems to work well at a reasonable viewing distance.

Uploaded: ...

Sky plot

Sky plot

Histogram

A Lonely M51, 



    
        

            Linda