Menu

NGC 637 — Open Cluster in Cassiopeia

Open Cluster Good (42/100)
Magnitude 8.2m OpenCluster Cassiopeia (Cas) Visible
Star Map
+ List + Plan Star Hop

Observe

1Properties

Magnitude 8.2
Angular Size 4.5′
Cl, pS, B & vF st

Position & Identifiers

RA 01h 43m 03.1s
Dec +64° 02' 11.8"
Constellation Cassiopeia (Cas)
Catalog NGC 637

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 Sep – Nov (peak: Oct)

4 Eyepiece View

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

NGC 637 · 4.5′ 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 609
Medium+
Open cluster
Open Cluster mag 11.0 0.9° Cassiopeia
C8
NGC 559
Easy
Open cluster
Open Cluster mag 9.5 1.7° Cassiopeia
NGC 654
Easy
Rich open cluster
Open Cluster mag 6.5 2.2° Cassiopeia
IC 166
Medium
Open cluster
Open Cluster mag 11.7 2.4° Cassiopeia
SU Cas
Hard+
Pulsating variable, period 1.9d
Variable Star mag 5.80 8.4° Cassiopeia
NGC 281
Medium+
Emission nebula — try an OIII filter
Emission Nebula mag 7.0 9.6° Cassiopeia
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
Cassiopeia
Mythology, bright stars, and deep-sky highlights.
Constellation
Saturn
Rings, divisions, and the jewel of the outer Solar System.
Deep dive
}