M21

Observed:  Points: 20

Available Challenges:

Current Info for Observer

as of 04/19/2024 11:22 a.m.

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General Info

TypeOpen Cluster
ConstellationSagittarius
Right ascension18h4'13.400''
Declination-22°30'24''
Magnitude6.500
Distance4,250ly
Size13 arc min
Catalog Designations NGC6531, M21
Discovered 1764 Charles Messier

Generate a finder chart

The following form will generate a PDF finder chart suitable for printing using to locate objects in the sky with your telescope!

The Date is only really useful for solar system objects, as deep space objects move measurably only on a galactic timescale.

The larger the F.O.V (field of view), the more "zoomed out" the object will appear. It can be helpful to print several charts of the same object with different field of views.

Limiting the magnitude (remember, lower magnitude means brighter!) of stars and objects can make sure your chart is not cluttered with dim objects that you may not be visible to you anyway. The defaults are good, but try experimenting with raising and lowering the values.

M21

4.5in starblast
20 points

Hard to pick out at first but became more apparent with time. Showing hints of resolution.

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