Targets / Messier M21

Astrophotoguru™ · Open Cluster M21

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Messier M21

Open Cluster M21

Open Cluster
Sagittarius
Beginner
Angular size
13′
Magnitude
6.5
Best months
Jun-Sep
Constellation
Sagittarius
Catalog IDs
M21
Common aliases
NGC 6531
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Recommended telescopes

Celestron
Celestron EdgeHD 11
2800mm f/10.0 · 279mm aperture
Frames 45% of APS-C FOV
Celestron
Celestron EdgeHD 14
3910mm f/11.0 · 356mm aperture
Frames 63% of APS-C FOV
Meade
Meade LX200 10" ACF
2540mm f/10.0 · 254mm aperture
Frames 41% of APS-C FOV
Astro-Tech
Astro-Tech AT12RC
2432mm f/8.0 · 305mm aperture
Frames 39% of APS-C FOV
Takahashi
Takahashi Mewlon-210
2415mm f/11.5 · 210mm aperture
Frames 39% of APS-C FOV
Celestron
Celestron EdgeHD 9.25
2350mm f/10.0 · 235mm aperture
Frames 38% 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 11 + ZWO ASI2600MC Pro
FOV 0.48° × 0.32°
Scale 0.28″/px
Target fills 67% of frame
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Celestron EdgeHD 14 + ZWO ASI2600MC Pro
FOV 0.34° × 0.23°
Scale 0.20″/px
Target fills 94% of frame
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Meade LX200 10" ACF + ZWO ASI533MC Pro
FOV 0.26° × 0.26°
Scale 0.31″/px
Target fills 85% of frame
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Related open clusters

Messier M52
Open Cluster M52
Messier M11
Wild Duck Cluster
Messier M36
Pinwheel Cluster
Messier M26
Open Cluster M26
NGC NGC 6231
Northern Jewel Box
Messier M29
Open Cluster M29
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