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Messier M103
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Open Cluster M103
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Messier M103
Open Cluster M103
Open Cluster
Cassiopeia
Beginner
Angular size
6′
Magnitude
7.4
Best months
Sep-Feb
Constellation
Cassiopeia
Catalog IDs
M103
Common aliases
NGC 581
Open in planner
Recommended telescopes
Celestron
Celestron EdgeHD 1400
3910mm f/11.0 · 356mm aperture
Frames 29% of APS-C FOV
Celestron
Celestron EdgeHD 1100
2800mm f/10.0 · 279mm aperture
Frames 21% of APS-C FOV
Meade
Meade LX200 10" ACF
2540mm f/10.0 · 254mm aperture
Frames 19% of APS-C FOV
Takahashi
Takahashi Mewlon-210
2415mm f/11.5 · 210mm aperture
Frames 18% of APS-C FOV
Celestron
Celestron C9.25 SCT
2350mm f/10.0 · 235mm aperture
Frames 17% of APS-C FOV
Celestron
Celestron EdgeHD 9.25
2350mm f/10.0 · 235mm aperture
Frames 17% of APS-C FOV
Recommended cameras
ZWO
ZWO ASI2600MC Pro
3.76µm pixels · cooled
ZWO
ZWO ASI2600MM Pro
3.76µm pixels · cooled
ZWO
ZWO ASI6200MC Pro
3.76µm pixels · cooled
ZWO
ZWO ASI6200MM Pro
3.76µm pixels · cooled
ZWO
ZWO ASI533MC Pro
3.76µm pixels · cooled
ZWO
ZWO ASI533MM Pro
3.76µm pixels · cooled
Example framing
Celestron EdgeHD 1400
+
ZWO ASI2600MC Pro
FOV
0.34° × 0.23°
Scale
0.20″/px
Target fills
43%
of frame
Preview in planner
Celestron EdgeHD 1100
+
ZWO ASI2600MC Pro
FOV
0.48° × 0.32°
Scale
0.28″/px
Target fills
31%
of frame
Preview in planner
Meade LX200 10" ACF
+
ZWO ASI533MC Pro
FOV
0.26° × 0.26°
Scale
0.31″/px
Target fills
39%
of frame
Preview in planner
Related open clusters
NGC NGC 6939
Open Cluster NGC 6939
Messier M18
Open Cluster M18
Messier M73
Asterism M73
Messier M29
Open Cluster M29
Messier M36
Pinwheel Cluster
Messier M21
Open Cluster M21
Browse all targets
Browse equipment
Imaging planner
celestron-edgehd-1400
Messier M103 — Open Cluster M103