| Designation(s) | Arp 324, Abell 2147 |
| Object Type(s) | Galaxy, Galaxy Cluster |
| Relevant Catalog(s) | All (Chron), Arp |
| Arp Category | Chains of galaxies |
| Obs. Lat/Long | 42° 17', 073° 57' |
| Constellation | Hercules |
| Date and Time Observed | 2025-07-23 23:55:00 |
| Instrument | EdgeHD 8" w/f7 reducer-1,422mm FL |
| Camera | Player One Apollo-M Mini |
| Image Details | Up is 181.7 degrees E of N. Transparency: Good. Seeing: Fair. Total integration time was 20m 15s. Exposures 15s@300g, NoFilter. Dithered and recentered in SharpCap. No guiding. |
| Description | Arp comments: "Diffuse elongation of E[liptical Galaxy]'s along line joining them." This is pretty evident in both Arp's plate (probably from the POSS survey and taken with the 48" Schmidt telescope rather than the 200" Hale). Interesting that Arp is posting a subset of Abell 2147. George Abell was a Ph.D. student at CalTech who created the Abell catalog as part of his Ph.D. thesis relying on the POSS survey for data. This was Zwicky's big project during this time. The survey was published in 6 volumes just prior to the Atlas of Peculiar Galaxies being published. Abell identified several thousand galaxy clusters within the survey, and his list (expanded later to include the southern hemisphere) is well remembered and a frequent target source for amateur astronomers. |
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