Widefield Omega Nebula and the Small Sagittarius Star Cloud (Steve Sells)

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: Checkmark Nebula · IC 1283 · IC 1284 · IC 4701 · IC 4715 · Lobster Nebula · M 17 · M 18 · M 24 · NGC 6561 · NGC 6596 · NGC 6605 · NGC 6613 · NGC 6618 · Small Sgr Star Cloud · Swan Nebula · omega Nebula

Widefield Omega Nebula and the Small Sagittarius Star Cloud, Steve Sells

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Widefield Omega Nebula and the Small Sagittarius Star Cloud

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Widefield Omega Nebula and the Small Sagittarius Star Cloud

This is a telephoto view of an interesting part of the Milky Way. The many stars of the Small Sagittarius Star Cloud, IC 4715, appear very close together but they are not gravitationally bound together in a structure like a star cluster is. It does contain several catalogued star clusters, including NGC 6613, the Black Swan Cluster. The apparent size of IC 4715 is about 1 degree by 2 degrees. It's an extremely large cloud of stars, spanning about 600 light years.

The much smaller Omega Nebula, NGC 6618, has an apparent size of 11 arcminutes and an actual size of about 15 light years across. It's about 5,500 light years away. Its red light is the light of glowing hydrogen, ionized by ultraviolet radiation from bright stars within the nebula.

PixInsight counted 22,054 stars in this picture!

The image labeled "Original" shows the rig used to shoot the astrophoto.

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Imaged with APT

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Status	Basic success
Started	...
Astrometry.net job	5809787
PixInsight job	n/a
PixInsight queue size	n/a
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Widefield Omega Nebula and the Small Sagittarius Star Cloud

Widefield Omega Nebula and the Small Sagittarius Star Cloud

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Widefield Omega Nebula and the Small Sagittarius Star Cloud

Widefield Omega Nebula and the Small Sagittarius Star Cloud

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