# Ptolemy's Cluster (M 7)

Ptolemy's Cluster (M 7) is an open cluster in the constellation Scorpius, magnitude 3.3, 1.3° across.

A large, brilliant open cluster near the Scorpion's tail, visible to the naked eye and recorded by Ptolemy around AD 130. It spans more than two full Moons, so binoculars or a wide-field eyepiece frame it best.

## When and where to see it

It is best placed in the evening sky around July, when it crosses the meridian at about 10 pm local time (around midnight in June). It can be seen from everywhere south of 55°N and never sets south of 55°S.

At its highest it stands 5° up from 50°N, 20° up from 35°N, 55° up from the equator, 90° up from 35°S.

## Facts

- Type: Open cluster
- Constellation: Scorpius
- Designations: M 7, NGC 6475, Mel 183, Cr 354, Melotte 183, Collinder 354
- Magnitude: 3.3
- Apparent size: 1.3°
- Position: RA 17h 53.9m, Dec −34° 48′ (J2000)

Open AstroPilot to see when Ptolemy's Cluster (M 7) is highest tonight from your location, how easy it is with your telescope or binoculars, and an eyepiece view. https://astropilot.space/object/M7