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RA: 05h 35m 12s
Dec: +09° 42′ 0″
Ch: MSA:206, U2:180, SA:11
Ref: SIMBAD, DAML02, Archinal&Hynes (2003)
Type: open cluster, 33pn
Mag: B=?, V=2.8
Tom Lorenzin, in the electronic version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "Lambda ORI, Struve 738, mag 4.0. 4.4" separation (A-B) @ PA 043; 4-6M; blue/blue; companion, C = 11 .1M, 30" distant @ PA 184; 20-plus members over 1-degree-wide area form cluster Coll-69; binocular object in ORI's "Club"."
16-inch f/10 SCT (127x)
The Sigma Orioni cluster, listed as having 20 stars. It is somewhat large with the Sigma system of multiple very prominent and beautiful.
The Messier objects
The Bennett objects
The Caldwell list
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