Menu

NGC 2243 — Open Cluster in Canis Major

Open Cluster Good (45/100)
Magnitude 9.4m OpenCluster Canis Major (CMa) Visible
Star Map
+ List + Plan Star Hop

Observe

1Properties

Magnitude 9.4
Angular Size 5.1′
F Cl, st 9...11

Position & Identifiers

RA 06h 29m 34.5s
Dec -31° 16' 52.7"
Constellation Canis Major (CMa)
Catalog NGC 2243

2How easy to spot?

Sign in and configure your equipment and default location to see a personalized row.
Telescope Bortle 3 Bortle 4 Bortle 5
80mm refr. Easy Medium+ Medium+
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

Set a location in User Settings to see visibility data.

Best season Nov – Jan (peak: Dec)

4 Eyepiece View

Log in to set your own equipment
125x TFOV: 0.4° Lim. mag: 13.6
N E

NGC 2243 · 5.1′ diameter

5 Best Magnification

Explore

6 Classification Decoder

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.

HIP 31190
Easy
Easy double, sep 24.7″
Double Star mag 5.69 1.0° Canis Major
NGC 2217
Easy
Bright spiral galaxy
Galaxy mag 10.4 4.4° Canis Major
NGC 2298
Easy
Globular cluster — dense ball of ancient stars
Globular Cluster mag 9.4 6.2° Puppis
Collinder 121
Easy
Open cluster
Open Cluster mag 2.6 8.8° Canis Major
Collinder 132
Easy
Open cluster
Open Cluster mag 3.6 9.8° Canis Major
Show on Map

Explore Nightbase

Related knowledge, tools, and stories — no observation planning required.

Canis Major
Mythology, bright stars, and deep-sky highlights.
Constellation
The Hertzsprung-Russell Diagram — Reading Stars Like a Map
The HR diagram turns the night sky into a physics map: every named star has a spot, every spot tells you mass, age, and fate. A guide for amateur observers.
Article
Venus
Phases, transits, and the brightest planet in the sky.
Deep dive
}