Ptolemy Cluster (M7)

Ptolemy Cluster (M7) is a open cluster in the constellation Scorpius, with an apparent magnitude of 3.5. It is about 978 light-years away.

Finder chart for the Ptolemy Cluster (M7) in the constellation Scorpius
the Ptolemy Cluster (M7) (circled) in Scorpius. Pink symbols mark Messier objects.
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Facts

CatalogMessier 7 (M7)
Typeopen cluster
ConstellationScorpius
Apparent magnitude3.5
Distanceabout 978 light-years
Right ascension17 h 53.8 min
Declination−34.79°
Best monthAugust (at about 9 pm)

Sources: star positions, magnitudes and colors from the Yale Bright Star Catalogue; constellation boundaries and star names from the IAU; areas and distances from Wikidata; stick figures by M. van der Sluys. How the maps are made.

How to find the Ptolemy Cluster

The Ptolemy Cluster is in Scorpius. From 40° N it is highest in the south in August evenings, about 15° up. From 35° S it reaches about 90° in the north. It is visible to the naked eye under a dark sky and easy in binoculars.

Scorpius constellation →

Other Messier objects in Scorpius

Messier 4 (M4)Butterfly Cluster (M6)Messier 80 (M80)

The Messier catalog →

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