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Collinder 104 — Open Cluster in Monoceros

Open Cluster Good (45/100)
Magnitude 9.2m OpenCluster Monoceros Visible
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1Properties

Magnitude 9.2
Angular Size 20 arcmin
Open Cluster

Position & Identifiers

RA 06h 36m 30.0s
Dec +04° 49' 00.0"
Constellation Monoceros
Catalog Cr 104

2How easy to spot?

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Telescope Bortle 3 Bortle 4 Bortle 5
80mm refr. Easy Easy 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

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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

Collinder 104 · 20.0′ 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 107
Easy
Open cluster
Open Cluster mag 5.1 0.3° Monoceros
NGC 2252
Easy
Open cluster
Open Cluster mag 8.0 0.7° Monoceros
Collinder 106
Easy
Open cluster
Open Cluster mag 4.6 1.1° Monoceros
NGC 2244
Easy
Open cluster
Open Cluster mag 4.8 1.1° Monoceros
Rosette Nebula
NGC 2237
Medium+
Emission nebula — try an OIII filter
Emission Nebula mag 6.0 1.2° Monoceros
T Mon
Easy
Pulsating variable, period 27.0d
Variable Star mag 5.98 3.6° Monoceros
Show on Map

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