| Designation(s) | Arp 10, UGC 1775 |
| Object Type(s) | Galaxy |
| Relevant Catalog(s) | All (Chron), Arp |
| Arp Category | Spiral galaxies with split arms |
| Obs. Lat/Long | 42° 17', 073° 57' |
| Constellation | Cetus |
| Date and Time Observed | 2025-01-03 20:42:40 |
| Instrument | EdgeHD 8" w/f7 reducer-1,422mm FL |
| Camera | Player One Apollo-M Mini |
| Image Details | Up is 96.0 degrees E of N. Total integration time was 50m. Exposures 15s@300g, UV/IR Cut Filter. Darks subtracted, no flats. Dithered and recentered in SharpCap. No guiding. |
| Description | Another challenging observation because 1) there is a big disparity in surface brightness, with 2) the outer disk showing very faintly. The conventional Arp negative plate is difficult to interpret, so we've "developed" it in Affinity Photo in the comparison image. I'm frankly puzzled why Arp called out the "split arms" (presumably the arms to the left and right of the image) when the ring feature is so dominant and unusual in its own right. A number of papers have been written in the 2000's attributing the ring to the results of a galaxy collision or "accretion". One paper by Russian Astronomers (Bizyaev et al, The Astrophysical Journal, 662:304-321, 2007 June 10) attributes the ring structure to a galaxy collision and, if I interpret the paper correctly, their candidate for galaxy that did the deed is the bright knot or bulge in the galactic center. This is evident in my capture and slightly more distinct in Arp's. |
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