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Cl Collinder 121 (4,384 of 18,816)


oc gc pln bn dn gx gxcl ast aka lost




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omicron Canis Minorum Cluster

Cl Collinder 121, C 0652-245, Ocl 619.0, COCD 115, omicron Canis Minorum Cluster

RA: 06h 56m 20s
Dec: −24° 43′ 46″

Con: Canis Major
Ch: MSA:346, U2:318, SA:19

Ref: SIMBAD, DAML02, Archinal&Hynes (2003)

(reference key)

Type: open cluster, 43p

Mag: B=3.02, V=2.6

Size: 60′
PA: ?

Modern observations

Tom Lorenzin

Omicron CMA Group Tom Lorenzin, in the electronic version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "3M; 50' diameter; large, bright and sparse; a great binocular object located at the S end of the Great Dog."

Contemporary observations

Auke Slotegraaf

I will have to take Collinder's word that this is an open cluster, it looks more like a reasonable starfield when viewed with a 10-inch f/5 at 30x. On the northern edge of the cluster lies 16 CMa, a variable star which has a clear orange-red colour. The star's colour is easily visible in 11x80 binoculars.

Richard Ford

2013 February 7th, Thursday

Location:Blesfontein Guest Farm,Sutherland.


Sky Conditions:The most crystal clear sky possible.Dark moon and stars magnitude 6 and fainter are visible with the naked eye.Excellent clean sky,limited star flickering and brilliant objects.

Instrument:12-inch Dobsonian.

This open cluster is seen as a very large cluster whereby I have counted 20 stars within a fixed diameter that is not separated.In this open cluster there are bright and faint stars mixed together that is orientated in a north to south direction.This open cluster measures 53.5'x 44.5'with P.A:North/South.Chart No.96,NSOG Vol.1.

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