Arp 81 / NGC 6621 and 6622

Designation(s)Arp 81, NGC 6621, NGC 6622
Object Type(s)Galaxy
Relevant Catalog(s)All (Chron), Arp, NGC
Arp CategorySpiral galaxies with large high surface brightness companions on arms
Obs. Lat/Long42° 17', 073° 57'
ConstellationDraco
Date and Time Observed2024-09-02 21:28:00
InstrumentEdgeHD 8" f10-2,032mm FL
CameraASI294MC-Pro
Image DetailsUp is 179.6 degrees E of N. Total integration time was 20m 30s. Exposures 30s@305g, UV/IR Cut Filter. Darks subtracted, no flats. Dithered and recentered in SharpCap. No guiding.
DescriptionCaptured on a dark night but where clouds closed in and forced me to shut down early. A pair of interacting spiral galaxies with one (6621) exhibiting a long arm separated from the spiral and connecting to the smaller one (6622). The two certainly appear to be in the process of merging, and I would love to see a simulation of the relative motion which created the long, wrap-around separation of the arm.
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