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Contains:  NGC 3656
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Arp 155 / NGC 3656, 


            Gary Imm
Arp 155 / NGC 3656

Arp 155 / NGC 3656

Technical card

Resolution: 3729x2429

Dates:March 29, 2019April 1, 2019

Astrodon Blue 31mm Gen2 I-Series: 60x30" (gain: 139.00) -20C bin 1x1
Astrodon Green 31mm Gen2 I-Series: 60x30" (gain: 139.00) -20C bin 1x1
Astrodon Lum 31mm Gen2 I-Series: 200x30" (gain: 139.00) -20C bin 1x1
Astrodon Red 31mm Gen2 I-Series: 60x30" (gain: 139.00) -20C bin 1x1

Integration: 3.2 hours

Avg. Moon age: 24.67 days

Avg. Moon phase: 25.45% job: 2654316

RA center: 170.909 degrees

DEC center: 53.841 degrees

Pixel scale: 0.391 arcsec/pixel

Orientation: 89.616 degrees

Field radius: 0.242 degrees

Locations: Backyard (Mag 20.8 - New Moon), Onalaska, Texas, United States

Data source: Backyard


This unusual small object is located 130 million light years away in the constellation of Ursa Major. It is entry 155 in the Arp catalog, under the category of "disturbed galaxies with interior absorption". It looks to me to be the result of a recent merger between a spiral galaxy and an elliptical galaxy, but who knows? I couldn't find an image of this object on Astrobin.

The bright spherical core has an apparent diameter of less than one arc-minute. I like the distinct dark dust band which spans the core. Numerous streams are visible, mainly on the right side of the object. The overall size of this object is larger than our Milky Way.

Many small yellowish galaxies are visible in the background near this object.



Gary Imm
License: None (All rights reserved)

Sky plot

Sky plot


Arp 155 / NGC 3656, 


            Gary Imm