| Designation(s) | Arp 89, PGC 24469, NGC 2648 |
| Object Type(s) | Galaxy |
| Relevant Catalog(s) | All (Chron), Arp, NGC |
| Arp Category | Spiral galaxies with large high surface brightness companions on arms |
| Obs. Lat/Long | 42° 17', 073° 57' |
| Constellation | Cancer |
| Date and Time Observed | 2025-01-26 23:35:00 |
| Instrument | EdgeHD 8" w/f7 reducer-1,422mm FL |
| Camera | Player One Apollo-M Mini |
| Image Details | Up is 269.5 degrees E of N. Total integration time was 35m. Exposures 30s@300g, UV/IR Cut Filter. Darks subtracted, no flats. Dithered and recentered in SharpCap. No guiding. |
| Description | There's no doubt that NGC 2648 enjoys a "high surface brightness companion" in PGC 24469. Not so bright, however, that William Herschel saw it when he discovered NGC 2648 in 1784. It's not listed in the IC catalog, so presumably wasn't observed until some time during the 20th century. The inverted image clearly shows a direct connection, implied as well by the slight "integral sign" shape of NGC 2648 from what presumably started as a classic spiral galaxy. |
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