Hemisphere:  Southern  ·  Constellation: Cetus (Cet)
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DDO 221 (The Wolf-Lundmark-Melotte Galaxy), 


            Russ Carpenter
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DDO 221 (The Wolf-Lundmark-Melotte Galaxy)

Technical card

Dates:Sept. 4, 2019

Frames: 15x600"

Integration: 2.5 hours

Avg. Moon age: 5.72 days

Avg. Moon phase: 32.64%

Astrometry.net job: 3618549

RA center: 0h 2' 0"

DEC center: -15° 27' 49"

Pixel scale: 0.963 arcsec/pixel

Orientation: -89.839 degrees

Field radius: 0.453 degrees

Resolution: 2365x2415

Data source: Amateur hosting facility

Remote source: ChileScope


This image was completely reprocessed from old data.

DDO 221 is a very faint and rarely imaged dwarf galaxy. It’s a member of our Local Group, located in the outer regions. With an absolute magnitude of only -14.4, DDO is quite a challenge to image and process.

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 and Affinity Photo


Sky plot

Sky plot


DDO 221 (The Wolf-Lundmark-Melotte Galaxy), 


            Russ Carpenter