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NGC 6910 — Open Cluster in Cygnus

Open Cluster Good (51/100)
Magnitude 7.4m OpenCluster Cygnus (Cyg) Visible
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1Properties

Magnitude 7.4
Angular Size 6.3′
Cl, pB, pS, P, pC, st 10...12

Position & Identifiers

RA 20h 23m 12.0s
Dec +40° 46' 43.0"
Constellation Cygnus (Cyg)
Catalog NGC 6910
Physical size
10 light-years across — about 1.2× the Sun-to-Sirius 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 27 of 126 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 6910 · 6.3′ diameter

5 Best Magnification

6Where this cluster sits in time

1 Myr 10 Myr 100 Myr 1 Gyr 10 Gyr NGC 2362 Pleiades Hyades M67 NGC 188 NGC 6910 14 Myr

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.

Sador
HIP 100453; Gamma Cygni; 37 Cygni
Medium
Bright naked-eye star, mag 2.2
Double Star mag 2.20 0.6° Cygnus
Collinder 421
Easy
Open cluster
Open Cluster mag 10.1 0.9° Cygnus
Collinder 419
Easy
Open cluster
Open Cluster mag 5.4 1.0° Cygnus
M29
Cooling Tower Cluster
Easy
Open cluster
Open Cluster mag 7.1 2.3° Cygnus
RS Cyg
Easy
Mira-type variable, range 6.5–9.5
Variable Star mag 6.50 2.8° Cygnus
Crescent nebula
NGC 6888
Medium+
Emission nebula — try an OIII filter
Emission Nebula mag 7.44 3.2° Cygnus
IC 4996
Easy
Open cluster
Open Cluster mag 7.3 3.5° Cygnus
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