NGC 6520 — Open Cluster in Sagittarius
Good (48/100)
Observe
1Properties
Magnitude
8.0
Angular Size
5.4′
Cl, pS, Ri, lC, st 9...13
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Position & Identifiers
2How easy to spot?
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| Telescope | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| 80 mm refractor 80mm refr. | Easy | Easy | Easy |
| 150 mm Newton 150mm Newt. | Easy | Easy | Easy |
| Celestron C8 (203 mm SCT) C8 203mm | Easy | Easy | Easy |
Easy
Medium
Hard
Very hard
Impossible
Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs
Easy
on Seestar S50
3Visibility
Set a location in User Settings to see visibility data.
Best season
May – Jul
(peak: Jun)
4
Eyepiece View
5
Best Magnification
Explore
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.
Gamma Sgr
HIP 88567; Gamma1 Sagittarii
Pulsating variable, period 7.6d
Variable Star
mag 4.69
1.7°
Sagittarius
NGC 6522
Compact globular cluster
Globular Cluster
mag 8.6
2.1°
Sagittarius
M8
Lagoon Nebula
Emission nebula — try an OIII filter
Emission Nebula
mag 4.6
3.5°
Sagittarius
NGC 6530
Rich open cluster
Open Cluster
mag 4.6
3.5°
Sagittarius
NGC 6451
Open cluster
Open Cluster
mag 8.0
3.6°
Scorpius
Collinder 367
Open cluster
Open Cluster
mag 6.4
4.3°
Sagittarius
NGC 6546
Open cluster
Open Cluster
mag 8.0
4.7°
Sagittarius
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