Menu

NGC 3680 — Open Cluster in Centaurus

Open Cluster Good (56/100)
Magnitude 7.6m OpenCluster Centaurus (Cen) Visible
Star Map
+ List + Plan Star Hop

Observe

1Properties

Magnitude 7.6
Angular Size 5.7′
Cl, cL, pRi, lC, st 10...14

Position & Identifiers

RA 11h 25m 37.1s
Dec -43° 15' 00.4"
Constellation Centaurus (Cen)
Catalog NGC 3680

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
80mm refr. Easy Easy Easy
150mm Newt. Easy Easy Easy
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 Feb – Apr (peak: Mar)

4 Eyepiece View

Log in to set your own equipment
125x TFOV: 0.4° Lim. mag: 13.6
N E

NGC 3680 · 5.7′ diameter

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.

NGC 3564
Hard+
Bright spiral galaxy
Galaxy mag 12.2 6.4° Centaurus
Mu Vel
Medium
Tight double — a rewarding split at 2.3″
Double Star mag 2.69 9.1° Vela
Show on Map

Explore Nightbase

Related knowledge, tools, and stories — no observation planning required.

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
Centaurus
Mythology, bright stars, and deep-sky highlights.
Constellation
Venus
Phases, transits, and the brightest planet in the sky.
Deep dive
}