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NGC 3105 — Open Cluster in Vela

Open Cluster Fair (39/100)
Magnitude 9.7m OpenCluster Vela (Vel) Visible
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1Properties

Magnitude 9.7
Angular Size 4.1′
Cl, C, lE, st 13...16

Position & Identifiers

RA 10h 00m 39.5s
Dec -54° 47' 15.7"
Constellation Vela (Vel)
Catalog NGC 3105

2How easy to spot?

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Telescope Bortle 3 Bortle 4 Bortle 5
80mm refr. Easy 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 Jan – Mar (peak: Feb)

4 Eyepiece View

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125x TFOV: 0.4° Lim. mag: 13.6
N E

NGC 3105 · 4.1′ 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 3033
Easy
Open cluster
Open Cluster mag 8.8 2.4° Vela
NGC 2925
Easy
Open cluster
Open Cluster mag 8.0 4.3° Vela
NGC 3228
Easy
Rich open cluster
Open Cluster mag 6.0 4.4° Vela
IC 2581
Easy
Rich open cluster
Open Cluster mag 4.3 4.7° Carina
S Car
Easy
Mira-type variable, range 4.5–9.9
Variable Star mag 5.60 6.9° Carina
NGC 3372
eta Car nebula
Easy
Emission nebula — try an OIII filter
Emission Nebula mag 3.00 7.7° Carina
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