Observe
1Properties
Magnitude
3.0
Angular Size
240 arcmin
Open Cluster
Position & Identifiers
2How easy to spot?
Sign in
and configure your equipment and default location to see a personalized row.
| 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
Medium
on Seestar S50
3Visibility
Set a location in User Settings to see visibility data.
Best season
May – Jul
(peak: Jun)
4
Eyepiece View
19x
TFOV: 2.3°
Lim. mag: 13.6
Collinder 359 · 240.0′ diameter · N up, E left
5
Best Magnification
Survey Image
Loading survey image…
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.
67 Oph
Easy double, sep 54.7″
Double Star
mag 3.97
0.1°
Ophiuchus
NGC 6535
Compact globular cluster
Globular Cluster
mag 10.6
2.7°
Serpens
Collinder 350
Open cluster
Open Cluster
mag 6.1
3.6°
Ophiuchus
IC 4665
Open cluster
Open Cluster
mag 4.2
4.6°
Ophiuchus
NGC 6572
Small bright planetary nebula
Planetary Nebula
mag 9.0
4.8°
Ophiuchus
Tweedledee Cluster
NGC 6633
Rich open cluster
Open Cluster
mag 4.6
7.6°
Ophiuchus
IC 4756
Open cluster
Open Cluster
mag 5.0
9.8°
Serpens
Explore Nightbase
Related knowledge, tools, and stories — no observation planning required.
Ophiuchus
Mythology, bright stars, and deep-sky highlights.
Constellation
The Hertzsprung-Russell Diagram — Reading Stars Like a Map
The HR diagram turns the night sky into a physics map: every named star has a spot, every spot tells you mass, age, and fate. A guide for amateur observers.
Article
Venus
Phases, transits, and the brightest planet in the sky.
Deep dive
