Hemisphere:  Northern  ·  Constellation: Leo (Leo)  ·  Contains:  IC 2745  ·  Leo Triplet  ·  M 65  ·  M 66  ·  NGC 3623  ·  NGC 3627  ·  NGC 3628
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M65 / M66 / NGC 3628 (Arp 317), 



    
        

            Gary Imm
M65 / M66 / NGC 3628 (Arp 317), 



    
        

            Gary Imm

M65 / M66 / NGC 3628 (Arp 317)

Getting plate-solving status, please wait...
M65 / M66 / NGC 3628 (Arp 317), 



    
        

            Gary Imm
M65 / M66 / NGC 3628 (Arp 317), 



    
        

            Gary Imm

M65 / M66 / NGC 3628 (Arp 317)

Imaging telescopes or lenses: Takahashi TOA-130NFB

Imaging cameras: ZWO ASI1600MM-Cool

Mounts: Astro-Physics Mach1GTO

Guiding telescopes or lenses: Orion 60mm Guidescope

Guiding cameras: Orion StarShoot AutoGuider Pro Mono

Software: Main Sequence Software Sequence Generator Pro  ·  PixInsight  ·  Stark Labs PHD2 2.6.3

Filters: Astrodon Green 31mm Gen2 I-Series  ·  Astrodon Blue 31mm Gen2 I-Series  ·  Astrodon Lum 31mm Gen2 I-Series  ·  Astrodon Red 31mm Gen2 I-Series

Accessory: ZWO EFW  ·  Takahashi Flattener TOA-67  ·  Feathertouch Focuser Boss II Electronic Focusing Control


Dates:April 22, 2018

Frames:
Astrodon Blue 31mm Gen2 I-Series: 90x60" (1h 30') (gain: 139.00) -20C bin 1x1
Astrodon Green 31mm Gen2 I-Series: 90x60" (1h 30') (gain: 139.00) -20C bin 1x1
Astrodon Lum 31mm Gen2 I-Series: 180x60" (3h) (gain: 139.00) -20C bin 1x1
Astrodon Red 31mm Gen2 I-Series: 90x60" (1h 30') (gain: 139.00) -20C bin 1x1

Integration: 7h 30'

Avg. Moon age: 6.94 days

Avg. Moon phase: 45.34%


Astrometry.net job: 2040643

RA center: 11h 19' 56"

DEC center: +13° 18' 12"

Pixel scale: 0.782 arcsec/pixel

Orientation: -72.481 degrees

Field radius: 0.553 degrees


Resolution: 4046x3100

Locations: Backyard (Mag 20.8 - Bortle 4.5), Onalaska, Texas, United States

Data source: Backyard

Description

This object is the famous trio of galaxies, located 35 million light years away in the constellation of Leo. All of these galaxies are about the size of our Milky Way. Each is well detailed and displays interesting characteristics.

NGC 3628 is the edge-on spiral galaxy on the left. This galaxy is most notable for the beautiful dust lane which bisects it. This broad equatorial band obscures the galaxy’s bright central region and hides most of the bright young stars in its spiral arms. Gravitational interactions with the two galaxies on the right are believed to be responsible for the extended flare and warp of this spiral's disk. The gravitational pull of these neighboring galaxies has most likely tipped the plane of NGC 3628 and made its central dust lane “wobbled” in appearance.

M66 is the face-on galaxy at lower right. While all of these galaxies exhibit prominent dust lanes sweeping along their broad spiral arms, M66 is particular interesting in the contrast between the pinkish hues of hydrogen gas in star forming regions and the bluish hues of the young blue star clusters. It also displays a slightly odd non-symmetric structure, likely due to gravitation interaction with the other nearby galaxies. Also note that, just to the left of the core of M66, there appears to be a bluish concentration of star clusters which may have been ripped out of the core.

M65 is the inclined galaxy at upper right. I find this galaxy fascinating because of the symmetric brightness undulations as you move left to right across the galaxy diameter. The dark lanes appear as six dark circles as you move across the disk, interrupted by the glowing core.

I had difficulties imaging this object. I lost many subs due to a temperature compensation error in SGP which resulted in many subs being slightly out of focus. SGP this week has issued an update which fixes the error. I also lost some subs due to my error in SGP, where I somehow indicated 2x2 binning instead of usual 1x1 binning. Both of these errors are burned into my memory and should not happen again. Despite losing these subs, I am still happy with the detail of the image.

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  • Final
    M65 / M66 / NGC 3628 (Arp 317), 



    
        

            Gary Imm
    Original
  • M65 / M66 / NGC 3628 (Arp 317), 



    
        

            Gary Imm
    C

C

Description: Comparison to Original Arp Image

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M65 / M66 / NGC 3628 (Arp 317), 



    
        

            Gary Imm