Hemisphere:  Southern  ·  Constellation: Columba (Col)
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Dwarf Spiral Galaxy UGCA 106, 


            Russ Carpenter
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Dwarf Spiral Galaxy UGCA 106

Technical card

Dates:Dec. 19, 2020

Frames: 15x600"

Integration: 2.5 hours

Avg. Moon age: 5.06 days

Avg. Moon phase: 26.27%

Astrometry.net job: 4124009

RA center: 5h 11' 58"

DEC center: -32° 58' 1"

Pixel scale: 0.956 arcsec/pixel

Orientation: 89.295 degrees

Field radius: 0.319 degrees

Resolution: 1860x1515

Data source: Amateur hosting facility

Remote source: ChileScope


This small (1.7 arc minutes), dim galaxy is an elusive target. I believe this is the is the first time it has been imaged and published by an amateur.

On the other hand, with its bizarre morphology, UGCA 106 is a fascinating object. As stated in the Catalog of Southern Peculiar Galaxies and Associations, by Halton Arp and Barry Madore, “the outstanding problem in dwarf galaxies seems to be to explain why the grand spiral design becomes more and more disorganized and irregular as the dwarfs become lower in surface brightness, lower in luminosity, and presumably lower in mass.”

UGCA 106 is included in the Catalog as a peculiar galaxy, meeting the requirements of Category 20.

Tech Notes for ASA 500/3.6:
ASA Newtonian, 500 mm aperture, 1900mm focal length, F3.6
FLI Proline 16803, 9 mm pixel, 4096 X 4096
ASA DDM85 equatorial mount
Processing with PixInsight, StarTools, and Affinity Photo


Sky plot

Sky plot


Dwarf Spiral Galaxy UGCA 106, 


            Russ Carpenter