Arp 199 / NGC 5544-5
| Designation(s) | Arp 199, NGC 5544, NGC 5545 |
| Object Type(s) | Galaxy |
| Relevant Catalog(s) | All (Chron), Arp, NGC |
| Arp Category | Galaxies with material ejected from nuclei |
| Obs. Lat/Long | 42° 17', 073° 57' |
| Constellation | Bootes |
| Date and Time Observed | 2025-09-21 21:07:00 |
| Instrument | EdgeHD 8" w/f7 reducer-1,422mm FL |
| Camera | Player One Apollo-M Mini |
| Image Details | Up is 274.0 degrees E of N. Transparency: Fair. Seeing: Good. Total integration time was 45m 30s. Exposures 15s@300g, No Filter. Dithered and recentered in SharpCap. No guiding. |
| Description | These two galaxies were discovered by William Herschel on a very productive night in 1785. He originally classified it as a single galaxy. 40 years later his son, John, saw them clearly enough to separate them into two. Arp found the interaction interesting, but seemed to focus on "material ejected from nuclei". The Atlas plate (left in the comparison) shows a series of black dots near the glowing nuclei of both galaxies. They should show up in my positive image as bright spots. Given how dark these dots are in Arp's image, its surprising to me that these objects aren't more prominent in my capture. The only obvious corresponding bright spots are located towards the top of NGC 5545. I think it's equally likely that this material was stripped off one or the other of the galaxies as they intersected with each other. |
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