NGC 6603 — Open Cluster in Sagittarius
Good (40/100)
Observe
1Properties
Magnitude
11.0
Angular Size
4.2′
!, Cl, vRi, vmC, R, st 15 (Milky Way)
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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. | Medium | Hard+ | Hard |
| 150 mm Newton 150mm Newt. | Easy | Medium+ | Medium |
| Celestron C8 (203 mm SCT) 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
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.
M24
Small Sagittarius Star Cloud
Bright star cloud
Star Cloud
mag 2.5
0.4°
Sagittarius
Y Sgr
Pulsating variable, period 5.8d
Variable Star
mag 5.75
0.8°
Sagittarius
IC 1284
Diffuse nebula
Diffuse Nebula
mag 7.70
1.3°
Sagittarius
M18
Black Swan Cluster
Open cluster
Open Cluster
mag 7.5
1.3°
Sagittarius
NGC 6595
Open cluster
Open Cluster
mag 7.0
1.5°
Sagittarius
IC 4715 C
Noteworthy asterism
Asterism
mag 4.50
1.8°
Sagittarius
M25
IC 4725
Rich open cluster
Open Cluster
mag 4.6
3.2°
Sagittarius
NGC 6647
Open cluster
Open Cluster
mag 8.0
3.3°
Sagittarius
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