M25 in Sagittarius

CLICK ON IMAGE FOR FULL SIZE VIEW (1800x1350)

Scope: FSQ-106N 106 mm refractor  at f/5, Location: Laguna Mountains, CA   20 July 2012  Camera: Artemis285

Exposure: 10 x 3 min  (1x1 bin) exposure with UV/IR block, 7 x 1.5 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. M25 is the star cluster central in this image. This cluster is embedded in the milky way galaxy field, so this image shows a dense star field. Although a conspicuous cluster, it did not make the NGC as a listing - it did not even make the IC until 1908. As star clusters go, M25 is good sized with estimates of members ranging from 86 up to 600. M25 is about 2,000 light years distant from Earth. This image replaces an earlier image shown in the archives here..   Horizontal FOV is 55'

Image center is approximately - Equatorial 2000: RA: 18h 31m 48s Dec: -19°07'50" 

All images and content remain the property of Jim Thommes - copyright 2003 - 2012

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