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" which seems reasonably apt in this case. On the image, North is left. The overall galaxy appears elongated, though this may be exaggerated by the relatively low angle of view. The central disk, normally centered, is offset up and to the right. Huge knots are visible on both ends of core. The bright "core", usually circular, exhibits two, possibly three bright, circular centers, almost as if they were beaded. A huge debris trail flows from the lower left to underneath the core and is unconnected to any object near the far end. Merger relics?
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