Arp 159 / NGC 4747

Designation(s)Arp 159, NGC 4747
Object Type(s)Galaxy
Relevant Catalog(s)All (Chron), Arp, NGC
Arp CategoryGalaxies disturbed by interior absorption
Obs. Lat/Long42° 17', 073° 57'
ConstellationComa Berenices
Date and Time Observed2024-06-12 23:52:00
InstrumentEdgeHD 8" f10-2,032mm FL
CameraASI294MC-Pro
Image DetailsUp is 90.7 degrees E of N. Total integration time was 38m. Exposures 30s@305g, UV/IR Cut Filter. Darks subtracted, no flats. Dithered and recentered in SharpCap. No guiding.
DescriptionThis is a fascinating and challenging observation. NGC 4747 is a barred spiral galaxy categorized by Arp as exhibiting disturbances due to "interior absorption", though it strikes me that it exhibits several additional forms of disturbance as well. On the image, North is left. The key "internal disturbance" would seem to be an "extra" galactic center to the southeast of the barred center, looking like an additional galactic center extending its line. In addition, a wide tail extends NNE from the main disc of the galaxy, hinting of additional galaxies or dwarf galaxies either invisible within our field of view, or outside of it. A further, extremely faint dust lane extends NE
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