Antares - Rho Ophiuchi area

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About this Image

This area around the yellow supergiant Antares, some 700 times larger in diameter than the Sun, is one of the most colorful in the sky. Above left of Antares (Alpha Scorpii) lies the star Rho Ophiuchi embedded in the blue emission nebula IC 4604; the star in the red region on top right is Sigma Scorpii; just above Antares is the globular cluster M 4. To the bottom right is Tau-Scorpii. Within the dense dark dust lanes young stars are born, visible in the far IR. The distance to Antares is approx. 520 light years.
North is left.

Technical Details


Canon 200mm EF L lens fully open at f/2.8

Mount AP-400 GEM
Camera SBIG STL-11000M at -20C, internal filter wheel
Filters Astronomik LRGB
Date Aug 14, 2004.
Location Hakos/Namibia
Sky Conditions mag 6, good transparency, temperature 13 C,
Exposure LRGB= 15:15:15:15 min (5-minute sub-exposures)
all 1x1.
Processing Image aquisition in Maxim DL 4.0; Image calibration, aligning, mean stacking, DDP and color synthesis in ImagesPlus;
Photoshop: curves, color balance, cropped;