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NGC 6811 — Open Cluster in Cygnus

Open Cluster Good (59/100)
Magnitude 6.8m OpenCluster Cygnus (Cyg) Visible
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1Properties

Magnitude 6.8
Angular Size 7.2′
Cl, L, pRi, lC, st 11..14

Position & Identifiers

RA 19h 38m 12.0s
Dec +46° 34' 00.0"
Constellation Cygnus (Cyg)
Catalog NGC 6811
Physical size
7.9 light-years across — about 1.8× the Sun-to-Alpha-Centauri distance

2How easy to spot?

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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
At 150mm under B5 skies you should resolve about 94 of 294 members.

3Visibility

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Best season Jun – Aug (peak: Jul)

4 Eyepiece View

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125x TFOV: 0.4° Lim. mag: 13.6
N E

NGC 6811 · 7.2′ diameter

5 Best Magnification

6Where this cluster sits in time

1 Myr 10 Myr 100 Myr 1 Gyr 10 Gyr NGC 2362 Pleiades M67 NGC 188 NGC 6811 1.1 Gyr

Open clusters span more than four orders of magnitude in age — from newborn OB associations to ancient, metal-rich survivors.

7 Colour-Magnitude Diagram

A cluster's colour-magnitude diagram reveals its age: the bluer the turn-off point where the main sequence bends into red giants, the younger the cluster.

Loading member data…

Each point is a Gaia-DR3 member. Colour encodes spectral type; size reflects membership probability.

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8 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.

Fawaris
HIP 97165; Delta Cygni; 18 Cygni
Medium
Colorful double, sep 2.8″
Double Star mag 2.87 1.9° Cygnus
HIP 97757
Easy
Hot blue O-type star
Star mag 5.62 2.4° Cygnus
Blinking Planetary
NGC 6826
Medium+
Small bright planetary nebula
Planetary Nebula mag 8.8 4.1° Cygnus
RR Lyr
Medium+
Pulsating variable, period 13.6h
Variable Star mag 7.10 4.4° Lyra
NGC 6866
Easy
Open cluster
Open Cluster mag 7.6 5.1° Cygnus
NGC 6819
Easy
Open cluster
Open Cluster mag 7.3 6.4° Cygnus
Collinder 419
Easy
Open cluster
Open Cluster mag 5.4 9.3° Cygnus
NGC 6791
Easy
Open cluster
Open Cluster mag 9.5 9.4° Lyra
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