| Designation(s) | Arp 170, NGC 7578 |
| Object Type(s) | Galaxy |
| Relevant Catalog(s) | All (Chron), Arp, NGC |
| Arp Category | Galaxies with diffuse counter-tails |
| Obs. Lat/Long | 42° 17', 073° 57' |
| Constellation | Pegasus |
| Date and Time Observed | 2024-11-03 22:17:00 |
| Instrument | EdgeHD 8" w/f7 reducer-1,422mm FL |
| Camera | Player One Apollo-M Mini |
| Image Details | Up is 109.8 degrees E of N in positive views, approximately 0 degrees E of N in comparison. Total integration time was 25m. Exposures 15s@300g, UV/IR Cut Filter. Darks subtracted, no flats. Dithered and recentered in SharpCap. No guiding. |
| Description | At the heart of Arp 170 is a merged, curved, diffuse envelope of what (from the shape) are at least two elliptical galaxies. However, a total of 5 or 6 possible galactic nucleii track the same curve as the envelope. Are they all galactic cores, or are some asterisms? I can't tell and even the Palomar image doesn't disambiguate it much. In the inverted image there is a triangular shaped counter-tail extending NNE which circumscribes a trapezoidal pattern of 4 likely, tiny galaxies or galaxy-fragments. There's just a hint in my capture that the plume continues to the medium sized spiral galaxy, seen edge-on, in the SE corner of the image. A smaller, roughly triangular counter-tail extends SSW from the last two bright object in the main curve. They extend towards another "spec" which could well be another tiny galaxy. |
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