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The open cluster M21 is a loose collection of about 50 stars located less than one degree northeast of the Trifid nebula (M20) in Sagittarius. The cluster lies approximately 4000 light years away and has a diameter of about 15 arc-minutes. Together, M20 and M21 make up an asterism known as "Webb's Cross" with M21 at the northern end and M20 at the southern end of the cross. M21 was first observed by Charles Messier in 1764. [Source: O'Meara, Stephen James. "The Messier Objects". Cambridge: University of Cambridge and Sky Publishing, 1998. Print.]
The data for this LRGB photo was captured between 3 June and 5 June 2011. All images were taken at the Chiefland Astronomy Village in Chiefland, Florida. Complete details regarding this image can be found by clicking on the image above or by clicking here.
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