M18 in Sagittarius
CLICK ON IMAGE FOR FULL SIZE VIEW (1800x1350)
Scope: Megrez II 80 mm refractor at f/5.6, Location: Blair Valley, Anza Borrego Desert, CA 16 June 2012 Camera: Artemis285
Exposure: 13 x 6 min (1x1 bin) exposure with UV/IR block, 8 x 2.5 min (2x2 bin) RGB exposures.
Processing: Data Collection - Artemis Capture (as FITs). Calibrated, stacked (Sigma Combine), LRGB channel registration, equalization - Astroart. Curves, Levels, LRGB combine and finishing - Photoshop. This image is a straightforward LRGB combine with Luminance layering. Final Image size is approximately 1800 x 1350.
North is up in this image. M18 is the star cluster in the upper left in this image. This cluster is embedded in the milky way galaxy field, so this image shows a dense star field with nebulous regions and dark regions. As star clusters go, M18 is relatively small with not many member. It is a rather young cluster whose age is estimated at 32 million years. M18 is about 4,900 light years distant from Earth. This image replaces an earlier image shown in the archives here. Horizontal FOV is 65'
Image center is approximately - Equatorial 2000: RA: 18h 18m 59s Dec: -17°19'03"
All images and content remain the property of Jim Thommes - copyright 2003 - 2012
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