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NGC 7009 - Saturn Nebula, Mirosław Stygar

NGC 7009 - Saturn Nebula

Acquisition type: Lucky imaging
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NGC 7009 - Saturn Nebula, Mirosław Stygar

NGC 7009 - Saturn Nebula

Acquisition type: Lucky imaging

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Description

It's an extremely interesting object, but at the same time difficult to photograph and observe visually. In the latitudes of Krakow (where I live - Krakow, Poland) and the surrounding area, it levels up only at a height of about 29 degrees. Nevertheless, it has an interesting history worth mentioning. It was discovered by Wiliiam Herschel on September 7, 1782, using a telescope of his own design in the garden of his home in Datchet, England, and was one of his earliest discoveries made during his survey of the sky. It owes its name to its apparent resemblance to the planet Saturn - taking into account the deficiency of the optical equipment of the time, the "antennae" of this nebula could actually give the impression of the disk being present around the spherical center of the object.

I think it is worth looking at it for a moment and paying attention to the variety of structures, among them, the jets on its sides leading to the so-called ansa's. This is not a particularly isolated phenomenon - just look at such nebulae as PN M2-9; NGC 5307 or the beautiful NGC 6543. As far as I understand correctly, the mechanism of their formation is related to the fact that the possibility of emission of matter ejected after the death of the primary star is limited by its rotation (although not always and not completely). So you can probably say that they are polar jets of stars. Another interesting fact - as long as the main emission lines for this object are related to OIII; Ha and He I - it is at the ends of the jets that we can also see NII. There are slight reflections in the spectrum that I measured, indicating this emission, but unfortunately, I set the filter mesh at the wrong angle and "lost" this ionized nitrogen.

SCT Celestron XLT Starbright 235/2350, ASI 462MC, 60% from 4500 x 1 sec. [05.09.2021]
SW 200/1000, ASI 294 MC Pro, SA 200 - 6 x 20 sec. [09.10.2021]

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