| Designation(s) | Arp 112, NGC 7805, NGC 7806, KUG 2359+311 |
| Object Type(s) | Galaxy |
| Relevant Catalog(s) | All (Chron), Arp, NGC |
| Arp Category | Elliptical galaxies repelling spiral arms |
| Obs. Lat/Long | 42° 17', 073° 57' |
| Constellation | Pegasus |
| Date and Time Observed | 2024-10-28 23:19:00 |
| Instrument | EdgeHD 8" w/f7 reducer-1,422mm FL |
| Camera | Player One Apollo Mini |
| Image Details | Up is 99.1 degrees E of N. Total integration time was 20m. Exposures 15s@300g, UV/IR Cut Filter. Darks subtracted, no flats. Dithered and recentered in SharpCap. No guiding. |
| Description | A compact cluster of 3 galaxies, clearly interacting. The third galaxy is indicated by the bright side-segment slightly below and right of NGC 7806.... it appears to be a very low surface brightness spiral which I can see nearly complete if I overstretch it and blow out the rest of the image. It is apparently a very strong UV emitter as it shows up on the KUG catalog, which is reserved for strong UV sources. It's unclear to me why the lower arm of NGC 7806 is so elongated. Arp categorizes it as a galaxy "repelling spiral arms". Really? Seems to me that gravity attracts not repels. An alternative explanation might be that one of the other galaxies passed below from right to left before being captured and pulled back into the current orientation. The extended arm, therefore, might be a legacy of the "fly by". |
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