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Collinder 394 — Open Cluster in Sagittarius

Open Cluster Excellent (61/100)
Magnitude 6.3m OpenCluster Sagittarius Visible
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1Properties

Magnitude 6.3
Angular Size 22 arcmin
Open Cluster

Position & Identifiers

RA 18h 52m 16.0s
Dec -20° 12' 12.0"
Constellation Sagittarius
Catalog Cr 394

2How easy to spot?

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Telescope Bortle 3 Bortle 4 Bortle 5
80mm refr. Easy Easy Easy
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 May – Jul (peak: Jun)

4 Eyepiece View

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50x TFOV: 1.0° Lim. mag: 13.6
N E

Collinder 394 · 22.0′ 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.

NGC 6716
Easy
Rich open cluster
Open Cluster mag 6.9 0.6° Sagittarius
V3879 Sgr
Medium
Semi-regular variable, range 6.0–6.6
Variable Star mag 6.35 2.4° Sagittarius
NGC 6717
Medium+
Compact globular cluster
Globular Cluster mag 10.35 2.6° Sagittarius
M25
IC 4725
Easy
Rich open cluster
Open Cluster mag 4.6 4.9° Sagittarius
NGC 6647
Easy
Open cluster
Open Cluster mag 8.0 5.7° Sagittarius
NGC 6645
Easy
Open cluster
Open Cluster mag 9.0 5.7° Sagittarius
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