IC 4603 is part of the colourful Rho Ophiuchus Nebula Complex and is framed in the center of the image. The bluish clouds are formed by interstellar dust shining because the light reflected by the stars. The yellowish nebula at the bottom of the picture comes out of the material ejected by giant star Antares which is not in the image, but traces of its reflection can be seen in the lower left side. Dense dust clouds are opaque to visible light and can completely hide background stars. This object was a challenge to photograph as the maximum altitude from my location is only 20°.
IC 4603
Telescope: 16″ f3.75 Dream Scope
Camera: FLI ML16803
Mount: ASA DDM85
Exposure: 5.5 hours (33x300s L + 3x11x300s RGB)
Date: May 2020
Location: Southern Alps, France
Bart Delsaert - Astrophotography 