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N6188 is only the core of RCW 108
I would like to point out that the object in the photograph is not exactly NGC 6188.
The two-degree scale HII region in the photo is called
RCW 108, and only the small core of this nebula was catalogued as NGC 6188.
A good nickname for RCW 108 could be "The Ghost of Eta Carinae", in that it sort of resembles a ghostly version of Eta Carinae. This gigantic object is sometimes faintly but definitely visible in binoculars, on a very dark and clear night.
Most of the brighter emission nebulae in the Ara and Norma region are NOT actually in the NGC-IC ...... though some of them are bright enough that they should have made it into the NGC.
In fact, the only catalogue that covers the brighter Nebulae that are found between Ara and Circinus is called RCW, that is:
Rodgers Campbell & Whiteoak.
(There are some other HII region catalogues for the southern sky, but they include many ridiculously faint objects)
The Ara to Circinus Milky Way is "the hole in the NGC-IC";
it simply does not cover the nebulae in this region!
cheers,
madbadgalaxyman
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