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Contains:  NGC 5195, Whirlpool galaxy, M 51, NGC 5194
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M51 and NGC 5195 imaged from three different locations, 





    
        

            rhedden
M51 and NGC 5195 imaged from three different locations

M51 and NGC 5195 imaged from three different locations

Technical card

Resolution: 2728x2180

Dates:April 23, 2017April 26, 2017May 26, 2017May 28, 2017

Frames:
Astrodon 31mm LRGB E Series Gen 2 1.25": 17x600" -18C bin 1x1
Orion Extra Narrowband Filter Ha 1.25": 20x1080" -18C bin 1x1
Baader Planetarium LRGB 36mm: 34x360" -18C bin 1x1

Integration: 12.2 hours

Avg. Moon age: 14.90 days

Avg. Moon phase: 5.86%

Bortle Dark-Sky Scale: 5.00

Astrometry.net job: 1706038

RA center: 202.468 degrees

DEC center: 47.196 degrees

Pixel scale: 0.480 arcsec/pixel

Orientation: 137.166 degrees

Field radius: 0.233 degrees

Locations: Crosby Co., TX, White River Lake, TX, United States; Muleshoe National Wildlife Refuge, Muleshoe, TX, United States; Back Yard, Lubbock, TX, United States

Description

M51, the Whirlpool galaxy (NGC 5194), and its companion, NGC 5195, are among the most recognizable deep sky objects. Interestingly, the distance of this interacting pair is a matter of some debate, having been estimated at anywhere from 15 million light years to 35 million light years.

This image is in LRGB format with L(Ha)GB highlights added to demarcate the hydrogen emission nebulae. The H-alpha data were taken from my light-polluted, urban back yard on two nights when I could not travel to a dark site. The RGB data were taken from one of my dark sites, while the luminance data were taken from the other on a different night. It was good to get out to my two favorite dark sites after being confined to the city since last August.

I have stretched this image rather aggressively to show the myriad of faint galaxies in the background, but as a result, the sky background may be a little bit too bright for some imagers' tastes.

Comments

Author

rhedden
rhedden
License: None (All rights reserved)
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Revisions

  • M51 and NGC 5195 imaged from three different locations, 





    
        

            rhedden
    Original
  • Final
    M51 and NGC 5195 imaged from three different locations, 





    
        

            rhedden
    B

B

Revision with slightly darker background and higher contrast.

Sky plot

Sky plot

Histogram

M51 and NGC 5195 imaged from three different locations, 





    
        

            rhedden