Hemisphere:  Northern  ·  Constellation: Triangulum (Tri)  ·  Contains:  NGC 733  ·  NGC 736  ·  NGC 738  ·  NGC 739  ·  NGC 740  ·  NGC 750  ·  NGC 751  ·  NGC 761
Getting plate-solving status, please wait...
Arp 166, 



    
        

            Gary Imm
Arp 166, 



    
        

            Gary Imm

Arp 166

Getting plate-solving status, please wait...
Arp 166, 



    
        

            Gary Imm
Arp 166, 



    
        

            Gary Imm

Arp 166

Imaging telescopes or lenses: Takahashi TOA-130NFB

Imaging cameras: ZWO ASI 183MM Pro 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  ·  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:Jan. 1, 2020Jan. 2, 2020

Frames:
Astrodon Blue 31mm Gen2 I-Series: 30x120" (1h) (gain: 111.00) -20C bin 1x1
Astrodon Green 31mm Gen2 I-Series: 30x120" (1h) (gain: 111.00) -20C bin 1x1
Astrodon Lum 31mm Gen2 I-Series: 60x120" (2h) (gain: 111.00) -20C bin 1x1
Astrodon Red 31mm Gen2 I-Series: 30x120" (1h) (gain: 111.00) -20C bin 1x1

Integration: 5h

Avg. Moon age: 6.32 days

Avg. Moon phase: 38.87%


Astrometry.net job: 3271767

RA center: 1h 57' 25"

DEC center: +33° 13' 4"

Pixel scale: 0.494 arcsec/pixel

Orientation: -62.428 degrees

Field radius: 0.370 degrees


Resolution: 4164x3414

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

Data source: Backyard

Description

This object is a pair of elliptical galaxies connected by a star stream bridge, located 220 million light years away in the constellation of Triangulum at a declination of +33 degrees. Not including the long star stream to the upper left, this object spans 2 arc-minutes in our apparent view, which corresponds to an actual width of 125,000 light years.

The upper galaxy of Arp 166 is NGC 750, the lower is NGC 751. I don't recall ever seeing a barbell structure connecting two galaxies quite like this before. It is so clean, symmetric and well defined that it looks fake to me. Several faint star stream shells are seen in the outer regions, which is characteristic of an elliptical galaxy post merger. Many small galaxies are seen in the background in the immediate vicinity of Arp 166, all significantly further away than Arp 166.

Although Arp 166 is the main attraction here, there are a number of other interesting objects. The spiral galaxy at far left is NGC 761, the spiral galaxy at far right is NGC 740, and the elliptical galaxy at far right is NGC 736. Note the faint star stream (reminiscent of the Umbrella Galaxy) extending up and to the left of the elliptical galaxy.

Many other tiny but beautiful galaxies are visible in the background.

I couldn't find another image of this object on Astrobin so this may be the first, but for such an incredible object, I find that hard to believe.

Comments

Revisions

  • Final
    Arp 166, 



    
        

            Gary Imm
    Original
  • Arp 166, 



    
        

            Gary Imm
    E

E

Description: Comparison to Original Arp Image

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Arp 166, 



    
        

            Gary Imm