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NGC 103 — Open Cluster in Cassiopeia

Open Cluster Good (45/100)
Magnitude 9.8m OpenCluster Cassiopeia (Cas) Visible
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1Properties

Magnitude 9.8
Angular Size 2.7′
Cl, pS, pC, st 11...18

Position & Identifiers

RA 00h 25m 16.4s
Dec +61° 19' 24.6"
Constellation Cassiopeia (Cas)
Catalog NGC 103

2How easy to spot?

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Telescope Bortle 3 Bortle 4 Bortle 5
80mm refr. Medium+ 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

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 103 · 2.7′ 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 129
Easy
Rich open cluster
Open Cluster mag 6.5 1.3° Cassiopeia
NGC 189
Easy
Open cluster
Open Cluster mag 8.8 1.7° Cassiopeia
IC 10
Medium
Galaxy
Galaxy mag 10.3 2.1° Cassiopeia
NGC 133
Easy
Open cluster
Open Cluster mag 9.0 2.1° Cassiopeia
NGC 146
Easy
Open cluster
Open Cluster mag 9.1 2.2° Cassiopeia
WZ Cas
Easy
Semi-regular variable, range 6.8–7.7
Double Star mag 6.90 3.1° Cassiopeia
V373 Cas
Hard+
Variable star, range 5.9–6.3
Variable Star mag 6.00 5.4° Cassiopeia
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