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Collinder 140 — Open Cluster in Canis Major

Open Cluster Excellent (64/100)
Magnitude 3.5m OpenCluster Canis Major Visible
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1Properties

Magnitude 3.5
Angular Size 60 arcmin
Open Cluster

Position & Identifiers

RA 07h 24m 27.0s
Dec -31° 51' 00.0"
Constellation Canis Major
Catalog Cr 140

2How easy to spot?

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Telescope Bortle 3 Bortle 4 Bortle 5
80mm refr. Easy Easy Easy
150mm Newt. Easy Easy Easy
C8 203mm Easy Easy Easy
Easy Medium Hard Very hard Impossible

Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs

Easy on Seestar S50

3Visibility

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Best season Dec – Feb (peak: Jan)

4 Eyepiece View

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30x TFOV: 1.7° Lim. mag: 13.6
N E

Collinder 140 · 60.0′ diameter

5 Best Magnification

Nearby in the Sky

Other targets within a few degrees — pan your scope a little and keep exploring.

Visibility scores assume a 150 mm Newton at Bortle 4.

Collinder 132
Easy
Open cluster
Open Cluster mag 3.6 2.3° Canis Major
Aludra
HIP 35904; Eta Canis Majoris; 31 Canis Majoris
Easy
Colorful double, sep 177.0″
Double Star mag 2.45 2.5° Canis Major
NGC 2439
Easy
Rich open cluster
Open Cluster mag 6.9 3.5° Puppis
Pi Puppis Cluster
Easy
Open cluster
Open Cluster mag 2.1 5.2° Puppis
NGC 2325
Medium+
Elliptical galaxy
Galaxy mag 11.2 5.7° Canis Major
NGC 2354
Easy
Rich open cluster
Open Cluster mag 6.5 6.6° Canis Major
29 CMa
Hard+
Eclipsing binary, period 4.4d
Variable Star mag 4.98 7.4° Canis Major
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