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Astrophotoguru · Ptolemy's Cluster
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M7

M7 — Ptolemy's Cluster

Open Cluster
· Scorpius
Beginner
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Observing: Tonight · 8:00 PM–5:00 AM

Observability

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Overall Imaging Recommendation

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Target information

Object type
Open Cluster
Constellation
Scorpius
Right ascension
17h 53m 54s
Declination
-34° 49′ 00″
Magnitude
3.3
Angular size
80′
Surface brightness
Not recorded
Difficulty
Beginner
Best months
May-Aug
Catalog IDs
M7

Recommended telescopes

Askar
500mm f/5.6 · 90mm aperture
Frames 50% of APS-C FOV
Takahashi
500mm f/2.8 · 180mm aperture
Frames 50% of APS-C FOV
Borg
500mm f/5.6 · 90mm aperture
Frames 50% of APS-C FOV
Askar
500mm f/5.8 · 85mm aperture
Frames 50% of APS-C FOV
Sky-Watcher
499mm f/6.1 · 82mm aperture
Frames 49% of APS-C FOV
SharpStar
518mm f/5.5 · 94mm aperture
Frames 51% of APS-C FOV

Recommended cameras

QHYCCD
3.76µm pixels · cooled
Player One
4.63µm pixels · cooled
ZWO
5.94µm pixels · cooled
OGMA
3.76µm pixels · cooled
OGMA
3.76µm pixels · cooled
ToupTek
2.90µm pixels · cooled

Example framing

FOV 4.13° × 2.75°
Scale 2.45″/px
Target fills 48% of frame
Preview in planner
FOV 4.13° × 2.75°
Scale 2.45″/px
Target fills 48% of frame
Preview in planner
FOV 2.19° × 1.49°
Scale 1.91″/px
Target fills 89% of frame
Preview in planner

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