Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  M 101  ·  M101  ·  NGC 5457  ·  NGC 5473  ·  NGC 5477  ·  NGC5447  ·  NGC5449  ·  NGC5450  ·  NGC5451  ·  NGC5453  ·  NGC5455  ·  NGC5461  ·  NGC5462  ·  NGC5471  ·  NGC5473  ·  NGC5477  ·  Pinwheel galaxy
Getting plate-solving status, please wait...
M101 - Luminance Only, 



    
        

            Ben Koltenbah
Powered byPixInsight

M101 - Luminance Only

Getting plate-solving status, please wait...
M101 - Luminance Only, 



    
        

            Ben Koltenbah
Powered byPixInsight

M101 - Luminance Only

Imaging telescopes or lenses: Explore Scientific 127mm ED APO

Imaging cameras: QSI 683wsg-8

Mounts: Astro-Physics Mach 1 GTO

Guiding telescopes or lenses: Explore Scientific 127mm ED APO

Guiding cameras: Starlight Xpress Ultrastar M

Focal reducers: Explore Scientific 0.7 Reducer/Flattener

Software: PixInsight  ·  PHD 2  ·  Astro-Physics AAPC  ·  Sequence Generator Pro

Filters: Astrodon Gen2E L

Accessory: Moonlite CFL Focuser


Dates:July 22, 2017

Frames: 34x300" (2h 50')

Integration: 2h 50'

Avg. Moon age: 28.48 days

Avg. Moon phase: 1.24%


Astrometry.net job: 1830959

RA center: 14h 3' 12"

DEC center: +54° 21' 12"

Pixel scale: 2.960 arcsec/pixel

Orientation: 0.782 degrees

Field radius: 0.936 degrees


Resolution: 1824x1364

Locations: Ben's Backyard, Federal Way, WA, United States

Description

This is a luminance image of M101 taken with my ES127 + 0.7x FR and QSI683wsg-8 last summer. I had lots of trouble then with reflections. They were so bad that I had not intended on doing anything with the frames. However, I've taken another look several months later and worked hard to remove as much of the background reflections as possible. You will note there is a reflection ring in the lower left corner. I could crop that out, but I wanted to retain as much of the FOV as possible to show M101 in its relative isolation.

Revision C is a mosaic of annotated images made using PixInsight's AnnotateImage script and then assembled using the InsertImage script. I also used the Annotation process to add some labels. The mosaic shows the location of many galaxies from the SDSS with magnitude and redshift values. I am impressed that galaxies down to magnitude 19.5 are actually visible as little point-like blotches. I would have assumed that these were just stars, but in actuality the ccd picked them up from my red zone suburban backyard.

Comments

Revisions

  • Final
    M101 - Luminance Only, 



    
        

            Ben Koltenbah
    Original
  • M101 - Luminance Only, 



    
        

            Ben Koltenbah
    B
  • M101 - Luminance Only, 



    
        

            Ben Koltenbah
    C

B

Description: Inverted L Image

Uploaded: ...

C

Description: Annotated L Image This is a mosaic showing galaxies from the SDSS down to magnitude 20. Remarkably, galaxies down to about 19.5 are actually visible in this image, but I would have otherwise assumed they were faint stars. (Note that AB made a false plate solve of this mosaic and oddly placed it near Leo!)

Uploaded: ...

Sky plot

Sky plot

Histogram

M101 - Luminance Only, 



    
        

            Ben Koltenbah

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