Celestial hemisphere:  Southern  ·  Constellation: Sagittarius (Sgr)  ·  Contains:  M 21  ·  NGC 6531
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M21, Gary Imm
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M21

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M21, Gary Imm
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M21

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Description

M21 is an open cluster located 4000 light years away in the constellation of Sagittarius at a declination of -22 degrees.  It is a magnitude 6 cluster which spans 14 arc-minutes in our apparent view.  This corresponds to a diameter of 16 light years.M21 consists mainly of small, faint stars, but is also home to a few blue giants. The cluster contains about 57 confirmed members.

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M21, Gary Imm