fast facts

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name: messier 21
name (alternate): ngc 6531
typ (catalog): open cluster (messier)
coordinates: (J2000)
ra: 18 h 4.6 m 0 s dec: -22 ° 30 ' 0 "
coord. for easier usage:
ra: 18.06667 dec: -21.5 usage is easier but not so exact
please remember:
some of the values can slighty differ by day and condition.
distance (approx.):
not added yet convert this
brightness (visible):
6.50 mag visible to the naked eye
not added yet
sagittarius (sgr) symbolism: the archer
proofpic: avaiable, please request if needed
different size: not added yet
additional Info: caltech, google, google images, simbad, wikipedia
extra text: is a relatively young cluster of a mere 4.6 million years of age
image (max. 500kb): click here to view the image
SLOOH only jump back
processing: it's recommended to use: open cluster
visible: yes