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mage is of M17, the Omega Nebula in Sagittarius about 5500 LY away and 15 LY across. At Dec -16 it is in the most light polluted part of the southern sky from my location but the 3.5nm Ha filter cuts through it quite well. The red colouring is a signature of glowing hydrogen gas.The white colour is real - it arises as a result of mixing the light from the hottest gasses with the starlight reflected by dust.

A total of 6 hours exposure with Baader Ha/O3/S2 NB filters on an Atik 460e /Mak-Newtonian 190/Maxim/DSS/PS5.
[Ian Smith]