TAU CMA (Tau Canis Majoris). Looking like any other modest star of a bright constellation, here Canis Major, the Larger Dog, a close examination of Tau Canis Majoris (known by no proper name) yields a set of amazing surprises.
To locate the primary, first find tau CMa, which is just to the northeast of delta CMa. Now look north of tau CMa, about 1.75 degrees and very very slightly to the west of due north. You should find the fairly bright primary with no problem.
The variable star UW CMa.
The star cluster NGC 2362. This nice little cluster of about 40 stars surrounds the star tau CMa, a blue giant of 4th mag. The cluster can be spotted by binoculars or small scopes.
 See also: Constellation, Magnitude, Star, Light Year, Light
  
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