M21
M21 · Guide in the Messier Catalog
Webb's Cross Cluster
Type
Open Cluster
Constellation
Sagittarius
Magnitude
+5.90
Season
Summer
Members only
This guide is part of the Messier Catalog
The full guide shows you where M21 is, how to star-hop to it, and what you'll really see at the eyepiece, with finder charts for your type of telescope.
Already bought it and still seeing this? Email me and I'll sort it out.