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NGC 6517 — Globular Cluster in Ophiuchus

Globular Cluster Fair (34/100)
Magnitude 10.3m GlobularCluster Ophiuchus (Oph) Visible
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1Properties

Magnitude 10.3
Angular Size 4.8′
pB, pL, R, rr

Position & Identifiers

RA 18h 01m 50.4s
Dec -08° 57' 34.2"
Constellation Ophiuchus (Oph)
Catalog NGC 6517

2How easy to spot?

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Telescope Bortle 3 Bortle 4 Bortle 5
80mm refr. Medium Medium 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

Easy 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 6517 · 4.8′ 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.

Tau Oph
HIP 88404; Tau Ophiuchi; 69 Ophiuchi
Hard+
Tight double — a rewarding split at 1.4″
Double Star mag 5.24 0.8° Ophiuchus
NGC 6539
Easy
Globular cluster — dense ball of ancient stars
Globular Cluster mag 9.6 1.6° Serpens
Y Oph
Medium
Pulsating variable, period 17.1d
Variable Star mag 6.21 3.6° Ophiuchus
NGC 6625
Easy
Open cluster
Open Cluster mag 9.0 6.0° Scutum
M14
NGC 6402
Easy
Globular cluster — dense ball of ancient stars
Globular Cluster mag 7.6 8.3° Ophiuchus
NGC 6535
Medium+
Compact globular cluster
Globular Cluster mag 10.6 8.7° Serpens
NGC 6366
Easy
Globular cluster — dense ball of ancient stars
Globular Cluster mag 10.0 9.3° Ophiuchus
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