IC 1727 and NGC 672 – Redux
| Designation(s) | IC 1727, NGC 672 |
| Object Type(s) | Galaxy |
| Relevant Catalog(s) | All (Chron), IC, NGC |
| Obs. Lat/Long | 42° 17', 073° 57' |
| Constellation | Triangulum |
| Date and Time Observed | 2025-10-18 22:09:00 |
| Instrument | EdgeHD 8" w/f7 reducer-1,422mm FL |
| Camera | Player One Apollo-M Mini |
| Image Details | Up is 276.5 degrees E of N. Transparency: Good. Seeing: Fair. Total integration time was 40m30s. Exposures 15s@225g, No Filter. Darks subtracted, no flats. Dithered and recentered in SharpCap. No guiding. |
| Description | Originally part of the November 2024 Cloudy Nights EAA Challenge - Redux due to October 2025 Challenge.. IC 1727 is an obscure object despite being relatively large and attractive in its own right, and situated in such close proximity to NGC 672. But its listing in the IC catalog is a clue: it's really hard to capture due to low surface brightness. The IC (Index Catalog) is essentially an extension to the NGC... objects are listed in one or the other, but never both, with the IC objects being discovered post 1895. Many were discovered using photographic plates because they were nearly invisible through a telescope eyepiece, whereas all NGC objects were discovered without photographic aids. William Herschel discovered NGC 672 on 26 October 1786, and he didn't miss much. But IC 1727 wasn't discovered until 29 November 1896 by Isaac Roberts using a 20" reflector telescope making photographic plates. I was pleased to see some improvement from 2024. Partly it's the use of inverted imagery, which makes IC727. The other is better use of Affinity Photo and Noise-X-Terminator to make a brighter, sharper image, despite somewhat shorter integration. Also, no longer using the UV/IR Cut filter, which actually slows integration with the mono sensor. |
| Related Observations | IC1727 (3) NGC672 (3) |
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