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NGC 2309 — Open Cluster in Monoceros

Open Cluster Fair (34/100)
Magnitude 11.0m OpenCluster Monoceros (Mon) Visible
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1Properties

Magnitude 11.0
Angular Size 5.4′
Cl, pL, pRi, mC, st 13

Position & Identifiers

RA 06h 56m 03.6s
Dec -07° 10' 27.5"
Constellation Monoceros (Mon)
Catalog NGC 2309

2How easy to spot?

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Telescope Bortle 3 Bortle 4 Bortle 5
80mm refr. Medium Hard+ Hard
150mm Newt. Easy Medium+ Medium
C8 203mm Easy Easy Medium+
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 Nov – Jan (peak: Dec)

4 Eyepiece View

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125x TFOV: 0.4° Lim. mag: 13.6
N E

NGC 2309 · 5.4′ diameter

5 Best Magnification

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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.

NGC 2302
Easy
Open cluster
Open Cluster mag 8.9 1.0° Monoceros
NGC 2299
Easy
Open cluster
Open Cluster mag 8.90 1.2° Monoceros
M50
NGC 2323
Easy
Rich open cluster
Open Cluster mag 5.9 2.0° Monoceros
NGC 2311
Easy
Open cluster
Open Cluster mag 10.0 2.6° Monoceros
NGC 2282
Medium+
Emission nebula — try an OIII filter
Emission Nebula mag 10.00 8.8° Monoceros
NGC 2296
Hard+
Elliptical galaxy
Galaxy mag 13.0 9.9° Canis Major
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