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NGC 231 — Open Cluster in Tucana

Open Cluster Fair (29/100)
Magnitude 12.0m OpenCluster Tucana (Tuc) Visible
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1Properties

Magnitude 12.0
Angular Size 1.8′
i train of st and neb

Position & Identifiers

RA 00h 41m 06.4s
Dec -73° 21' 08.6"
Constellation Tucana (Tuc)
Catalog NGC 231

2How easy to spot?

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Telescope Bortle 3 Bortle 4 Bortle 5
80mm refr. Hard V. hard+ V. hard
150mm Newt. Medium Hard+ Hard
C8 203mm Medium+ Medium Hard+
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 231 · 1.8′ 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 222
Medium+
Open cluster
Open Cluster mag 11.0 0.0° Tucana
NGC 220
Medium+
Open cluster
Open Cluster mag 11.0 0.1° Tucana
NGC 242
Hard+
Open cluster
Open Cluster mag 12.0 0.2° Tucana
NGC 176
Hard+
Open cluster
Open Cluster mag 12.0 0.4° Tucana
NGC 265
Hard+
Compact globular cluster
Globular Cluster mag 12.0 0.5° Tucana
NGC 406
Hard+
Barred spiral galaxy
Galaxy mag 12.0 4.0° Tucana
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