M16--M17RRGB(500).jpg (314273 bytes)

Higher-resolution versions:  1680 x 1050  3984 x 2615

M16 - Eagle Nebula
Object Type:
 Open Cluster, Emission Nebula
 Serpens Cauda
 35' x 28'
M17 - Swan Nebula
Object Type:
 Emission Nebula
Constellation: Sagittarius
Magnitude: 6.0
Size: 46' x 37'

M16, the Eagle Nebula, is named for its resemblance to the outstretched wings of an eagle. M16 actually refers to the open cluster NGC 6611; the associated nebulosity is IC 4703. The cluster is 5.5 million years old and is located at a distance of 7,000 light-years. Both M16 and M17 are visible to the naked eye in a dark sky.

Equipment: Vixen 102-ED/STL-11000M/Astrodon LRGB filters/Paramount ME
F-ratio: f/6.5
 RRGB: R 12 x 20 minutes: G 10 x 6 minutes: B 10 x 6 minutes: GB binned 2x2
 June 18-19, 2010
 Landers, California, USA

Technical Notes: Individual exposures were dithered using CCDAutoPilot2 and then sigma combined. The RGB image was created in Registar 1.0. A Gaussian Blur of 0.5 pixel was applied to the RGB image. A high-pass filter with a radius of 4 pixels was selectively applied to a copy of the luminance image. A duplicate of the RGB image was combined with the original using Soft Light to increase color saturation.

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