C36 / NGC 4559

Designation(s)C36, NGC 4559
Object Type(s)Galaxy
Relevant Catalog(s)All (Chron), Caldwell, NGC
Obs. Lat/Long42° 17', 073° 57'
ConstellationComa Berenices
Date and Time Observed2025-04-30 23:00:00
InstrumentEdgeHD 8" f10-2,032mm FL
CameraASI2600MC-Pro
Image DetailsUp is 268.8 degrees E of N. Transparency: Fair. Seeing: Fair. Total integration time was 60m. Bin 2. Exposures 20s/150g, UV/IR Cut Filter. Hot and cold pixel removal. Dithered and recentered in SharpCap. No guiding.
DescriptionThis is an intermediate spiral galaxy, with a bright central core and moderately low brightness disk. It seems to be developing "S" shaped arms, though the closer arm is much heavier than its opposite. There is also a long diagonal arm that cuts across the spiral structure, which strikes me as the result of some sort of interaction with another galaxy. This observation started reasonably clear, but a high cloud layer strengthened over time. There was only a 3-day moon, which was setting, but contributed to the slightly brown gradient. I did my best to reduce it without restricting the view of the galaxy's disk. Ordinarily, I would capture this with a mono-camera on my EdgeHD at f/7. However, the other targets for this evening all required color, so I settled for the 2600mc in bin 2. This is a noticeably slower rig. Yet another William Herschel discovery, this one from 1785.
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