Arp 136 with NGC 5821
| Designation(s) | Arp 136, NGC 5820, NGC 5821 |
| Object Type(s) | Galaxy, Galaxy Cluster |
| Relevant Catalog(s) | All (Chron), Arp, NGC |
| Arp Category | Galaxies with nearby fragments |
| Obs. Lat/Long | 42° 17', 073° 57' |
| Constellation | Bootes |
| Date and Time Observed | 2025-07-30 23:50:00 |
| Instrument | EdgeHD 8" w/f7 reducer-1,422mm FL |
| Camera | Player One Apollo-M Mini |
| Image Details | Up is 182.2 degrees E of N. Transparency: Fair. Seeing: Good. Total integration time was 13m 15s. Exposures 15s@300g, No Filter. Dithered and recentered in SharpCap. No guiding. |
| Description | Capture was cut short by clouds... I managed only 13m 15s and had hoped for at least 30m. Amazingly, I think this was "just enough" especially with enhancement. Arp categorizes 136 as an "E[lliptical] or E-like Galaxy with Nearby Fragments". His remarks: "Faint streamers off one end of E galaxy". These are presumably the plume at the right end of the main galaxy, and I presume also that the "fragments" are the little points of light at the end of the plume.
The big issue in my mind is what's causing the plume... It looks like a tidal wake if the galaxy were being pulled down and rotated clockwise by something quite powerful, below and to the right. The best candidate for that is actually outside of Arp's frame, but well in mine, which is NGC 5821... Clearly that's not what Arp had in mind, since he didn't include NGC 5821 in the Atlas image. Maybe he didn't have an explanation in mind, was just noticing the peculiarity. |
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