Hemisphere:  Northern  ·  Constellation: Pegasus (Peg)  ·  Contains:  PGC71748  ·  PGC71753
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Arp 46 and UGC 12667, 


            Gary Imm
Arp 46 and UGC 12667, 


            Gary Imm

Arp 46 and UGC 12667

Imaging telescopes or lenses: Celestron EdgeHD 11

Imaging cameras: ZWO ASI 294 MM Pro

Mounts: Astro-Physics Mach1GTO

Guiding cameras: ZWO ASI 174 MM Mini

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 2″X7  ·  Celestron OAG  ·  MoonLite Focuser for EdgeHD 11

Dates:Jan. 3, 2021Jan. 4, 2021

Astrodon Blue 31mm Gen2 I-Series: 30x120" (gain: 120.00) -20C bin 2x2
Astrodon Green 31mm Gen2 I-Series: 30x120" (gain: 120.00) -20C bin 2x2
Astrodon Lum 31mm Gen2 I-Series: 60x120" (gain: 120.00) -20C bin 2x2
Astrodon Red 31mm Gen2 I-Series: 30x120" (gain: 120.00) -20C bin 2x2

Integration: 5.0 hours

Avg. Moon age: 19.61 days

Avg. Moon phase: 75.53%

Astrometry.net job: 4231329

RA center: 23h 33' 44"

DEC center: +30° 2' 55"

Pixel scale: 0.344 arcsec/pixel

Orientation: -1.697 degrees

Field radius: 0.199 degrees

Resolution: 3356x2490

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

Data source: Backyard


This image captures a pair of objects (Arp 46 & UGC 12667) located in the constellation of Pegasus at a declination of +30 degrees. Both are Astrobin Debut Objects.

Arp 46, on the right, was classified by Dr. Arp into the category of Spiral Galaxies - Low Surface Brightness Companions on Arms. The large disturbed spiral galaxy is UGC 12665 and the companion at upper left is VV314b. UGC 12665 is a magnitude 15 object located 250 million light years away. It spans 1 arc-minute in our apparent view, which corresponds to a diameter of 70,000 light years.

I love how the upper arm of the spiral galaxy has been “captured” by the companion and moved to the right, leaving a star stream haze in its wake. It is not often that you see such clear interaction between a large spiral galaxy and its companion. The companion is bright, perhaps indication a burst of star formation.

The spiral galaxy at left is UGC 12667, located at half the distance away (130 million light years). This galaxy is only 40,000 light years in diameter but has a clear and interesting arm structure, with what appears to be 6 arms flailing about.