Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  Medusa Galaxy Merger  ·  NGC 4194
Getting plate-solving status, please wait...
Arp 160, 


            Gary Imm
Arp 160, 


            Gary Imm

Arp 160

Getting plate-solving status, please wait...
Arp 160, 


            Gary Imm
Arp 160, 


            Gary Imm

Arp 160

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: Pleaides Astrophoto PinInsight 1.8  ·  Adobe Inc Lightroom Classic  ·  Main Sequence Software Sequence Generator Pro  ·  Adobe Inc Adobe Photoshop CC 2021  ·  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: Celestron OAG  ·  ZWO EFW 2″X7  ·  MoonLite Focuser for EdgeHD 11

Dates:Feb. 20, 2021Feb. 21, 2021

Astrodon Blue 31mm Gen2 I-Series: 30x120" (1h) (gain: 120.00) -20C bin 2x2
Astrodon Green 31mm Gen2 I-Series: 30x120" (1h) (gain: 120.00) -20C bin 2x2
Astrodon Lum 31mm Gen2 I-Series: 60x120" (2h) (gain: 120.00) -20C bin 2x2
Astrodon Red 31mm Gen2 I-Series: 30x120" (1h) (gain: 120.00) -20C bin 2x2

Integration: 5h

Avg. Moon age: 8.48 days

Avg. Moon phase: 61.48%

Astrometry.net job: 4437838

RA center: 12h 14' 9"

DEC center: +54° 31' 40"

Pixel scale: 0.343 arcsec/pixel

Orientation: -1.606 degrees

Field radius: 0.207 degrees

Resolution: 3576x2478

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

Data source: Backyard


This object, also known as NGC 4194, is located 130 million light years away in the constellation of Ursa Major at a declination of +55 degrees. This magnitude 13.3 object spans 3 arc-minutes in our apparent view, which corresponds to a Milky Way like diameter of 120,000 light years.

It was classified by Dr. Arp into the category of Galaxies – Disturbed with Interior Absorption. All of the objects in this Arp category which have interesting star streams and dust lanes.

It looks to me like this is a late stage merger of 2 galaxies. I see signs of both of a spiral galaxy (e.g., flat inner disk and arms) and an elliptical galaxy (star stream shells). The colors of this object indicate star streams (blue), dust bands (brown), and HII regions (pink). I wasn’t confident that these vivid colors were real until I compared my image against the Hubble image.

The star stream ansae-like shell segments (faint at top and clearly seen at bottom), remind me of those of the more famous Arp 189 - Umbrella Galaxy.

This object has been nicknamed the Medusa Galaxies because the tidal stream resembles the hair of Medusa. Have I mentioned lately that I hate nicknames?