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NGC 6404 — Open Cluster in Scorpius

Open Cluster Good (40/100)
Magnitude 11.0m OpenCluster Scorpius (Sco) Visible
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1Properties

Magnitude 11.0
Angular Size 4.2′
Cl, F, L, pRi, lC, st 13...15

Position & Identifiers

RA 17h 39m 36.0s
Dec -33° 15' 00.0"
Constellation Scorpius (Sco)
Catalog NGC 6404

2How easy to spot?

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Telescope Bortle 3 Bortle 4 Bortle 5
80mm refr. Medium Hard+ Hard
150mm Newt. Easy Medium+ Medium
C8 203mm Easy Easy Medium+
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 May – Jul (peak: Jun)

4 Eyepiece View

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125x TFOV: 0.4° Lim. mag: 13.6
N E

NGC 6404 · 4.2′ 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.

M6
NGC 6405
Easy
Rich open cluster
Open Cluster mag 4.2 1.0° Scorpius
NGC 6416
Easy
Rich open cluster
Open Cluster mag 5.7 1.3° Scorpius
NGC 6374
Easy
Open cluster
Open Cluster mag 9.0 1.7° Scorpius
NGC 6396
Easy
Open cluster
Open Cluster mag 8.5 1.8° Scorpius
NGC 6453
Easy
Globular cluster — dense ball of ancient stars
Globular Cluster mag 9.9 2.7° Scorpius
3 Sgr
Medium
Pulsating variable, period 7.0d
Variable Star mag 4.54 5.7° Sagittarius
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