Hemisphere:  Northern  ·  Constellation: Draco (Dra)  ·  Contains:  NGC 6621  ·  NGC6621  ·  NGC6622
Getting plate-solving status, please wait...
Arp 81, 



    
        

            Gary Imm
Arp 81, 



    
        

            Gary Imm

Arp 81

Getting plate-solving status, please wait...
Arp 81, 



    
        

            Gary Imm
Arp 81, 



    
        

            Gary Imm

Arp 81

Imaging telescopes or lenses: Takahashi TOA-130NFB

Imaging cameras: ZWO ASI 1600MM Cooled Pro

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:March 20, 2019March 21, 2019

Frames:
Astrodon Blue 31mm Gen2 I-Series: 80x30" (40') (gain: 139.00) -20C bin 1x1
Astrodon Green 31mm Gen2 I-Series: 80x30" (40') (gain: 139.00) -20C bin 1x1
Astrodon Lum 31mm Gen2 I-Series: 160x30" (1h 20') (gain: 139.00) -20C bin 1x1
Astrodon Red 31mm Gen2 I-Series: 80x30" (40') (gain: 139.00) -20C bin 1x1

Integration: 3h 20'

Avg. Moon age: 14.69 days

Avg. Moon phase: 99.62%


Astrometry.net job: 2594615

RA center: 18h 12' 57"

DEC center: +68° 21' 41"

Pixel scale: 0.391 arcsec/pixel

Orientation: -70.766 degrees

Field radius: 0.214 degrees


Resolution: 3254x2233

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

Data source: Backyard

Description

This object is a tiny interacting pair of merging spiral galaxies, NGC 6621 and NGC 6622, located 300 million light years away in the constellation of Draco. NGC 6621 is the larger galaxy towards the top and NGC 6622 is at the bottom (the Astrobin annotation is incorrect). The galaxy pair is classified as a starburst system. The main portions of each of these galaxies are less than 30 arc-seconds in apparent width to us.

My favorite part of the image is the long curving star stream that connects both galaxies. This stream is twice the span of our Milky Way. Other signs of the merger include the distorted bright yellow galaxy cores, and the vigorous star formation as shown in the bright blue arc-like cluster midway between the two cores.

A number of other faint galaxies are visible in the background.

Comments

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  • Final
    Arp 81, 



    
        

            Gary Imm
    Original
  • Arp 81, 



    
        

            Gary Imm
    B

B

Description: Comparison to Original Arp Image

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Arp 81, 



    
        

            Gary Imm