M17 in SHO with RGB Stars (Chris Jensen)

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: Checkmark Nebula · HD168276 · HD168302 · HD168415 · HD168446 · HD168447 · HD168462 · HD168521 · HD168569 · HD168585 · HD168607 · HD168625 · HD168700 · HD168701 · HD168816 · HD168857 · HD168859 · HD168934 · IC 4706 · IC 4707 · LBN 60 · Lobster Nebula · M 17 · NGC 6618 · Sh2-45 · Swan Nebula · omega Nebula

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M17 in SHO with RGB Stars

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M17 in SHO with RGB Stars

Messier 17 imaged from Brisbane, Australia over four nights in late July and early August 2023.

The Omega Nebula, also known as the Swan Nebula, Checkmark Nebula, Lobster Nebula, and the Horseshoe Nebula (catalogued as Messier 17 or M17 or NGC 6618) is an H II region in the constellation Sagittarius. It was discovered by Philippe Loys de Chéseaux in 1745. Charles Messier catalogued it in 1764. It is by some of the richest starfields of the Milky Way, figuring in the northern two-thirds of Sagittarius.

The Omega Nebula is between 5,000 and 6,000 light-years from Earth, and it spans some 15 light-years in diameter. The cloud of interstellar matter of which this nebula is a part is roughly 40 light-years in diameter and has a mass of 30,000 solar masses. The total mass of the Omega Nebula is an estimated 800 solar masses. It is considered one of the brightest and most massive star-forming regions of our galaxy. Its local geometry is similar to the Orion Nebula except that it is viewed edge-on rather than face-on.

The open cluster NGC 6618 lies embedded in the nebulosity and causes the gases of the nebula to shine due to radiation from these hot, young stars; however, the actual number of stars in the nebula is much higher – up to 800, 100 of spectral type earlier than B9, and 9 of spectral type O, plus over a thousand stars in formation on its outer regions. It is also one of the youngest clusters known, with an age of just 1 million years.

The luminous blue variable HD 168607, in the southeast part of the nebula, is generally assumed to be associated with it; its close neighbour, the blue hypergiant HD 168625, may be too.

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Status	Advanced success
Started	...
Astrometry.net job	8275661
PixInsight job	DKF2R152YQGU1QCAF6N2CVPU2QP2AXAF
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	18h20m52s.81
RA (top/left)	18h18m05s.22
RA (top/right)	18h20m22s.94
RA (bottom/right)	18h23m40s.68
RA (bottom/left)	18h21m22s.48

Dec (center)	-16°03′57″.1
Dec (top/left)	-15°49′47″.6
Dec (top/right)	-16°46′00″.5
Dec (bottom/right)	-16°17′56″.6
Dec (bottom/left)	-15°21′51″.9

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M17 in SHO with RGB Stars

M17 in SHO with RGB Stars

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M17 in SHO with RGB Stars

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