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NGC 6355 — Globular Cluster in Ophiuchus

Globular Cluster Good (44/100)
Magnitude 9.6m GlobularCluster Ophiuchus (Oph) Visible
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1Properties

Magnitude 9.6
Angular Size 2.7′
cF, L, R, gbM, rrr

Position & Identifiers

RA 17h 23m 60.0s
Dec -26° 21' 00.0"
Constellation Ophiuchus (Oph)
Catalog NGC 6355

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 May – Jul (peak: Jun)

4 Eyepiece View

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125x TFOV: 0.4° Lim. mag: 13.6
N E

NGC 6355 · 2.7′ diameter · N up, E left

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.

Theta Oph
Easy
Hot blue O-type star
Double Star mag 3.27 1.4° Ophiuchus
NGC 6316
Easy
Globular cluster — dense ball of ancient stars
Globular Cluster mag 9.0 2.4° Ophiuchus
NGC 6325
Medium+
Globular cluster — dense ball of ancient stars
Globular Cluster mag 10.7 2.9° Ophiuchus
NGC 6293
Easy
Globular cluster — dense ball of ancient stars
Globular Cluster mag 8.2 3.1° Ophiuchus
NGC 6304
Easy
Compact globular cluster
Globular Cluster mag 8.4 3.7° Ophiuchus
3 Sgr
Medium
Pulsating variable, period 7.0d
Variable Star mag 4.54 5.4° Sagittarius
NGC 6374
Easy
Open cluster
Open Cluster mag 9.0 6.5° Scorpius
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