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NGC 133 — Open Cluster in Cassiopeia

Open Cluster Good (45/100)
Magnitude 9.0m OpenCluster Cassiopeia (Cas) Visible
Star Map
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1Properties

Magnitude 9.0
Angular Size 2.1′
Cl, pL, st 10..., D* inv

Position & Identifiers

RA 00h 31m 17.0s
Dec +63° 21' 09.4"
Constellation Cassiopeia (Cas)
Catalog NGC 133

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

Medium on Seestar S50

3Visibility

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Best season Aug – Oct (peak: Sep)

4 Eyepiece View

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125x TFOV: 0.4° Lim. mag: 13.6
N E

NGC 133 · 2.1′ 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 146
Easy
Open cluster
Open Cluster mag 9.1 0.2° Cassiopeia
NGC 225
Easy
Open cluster
Open Cluster mag 7.0 2.1° Cassiopeia
NGC 103
Easy
Open cluster
Open Cluster mag 9.8 2.1° Cassiopeia
NGC 189
Easy
Open cluster
Open Cluster mag 8.8 2.5° Cassiopeia
IC 10
Medium
Galaxy
Galaxy mag 10.3 4.3° Cassiopeia
NGC 281
Medium+
Emission nebula — try an OIII filter
Emission Nebula mag 7.0 7.3° Cassiopeia
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