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Loading contentM 18 is an open cluster in the constellation Sagittarius. It shines at apparent magnitude 6.9 and spans about 6 arcminutes of sky.
Guidance follows standard observing practice, derived from the object's real magnitude and position. A dark, moonless sky always helps.
| Object | Type | Mag | Size (′) |
|---|---|---|---|
| M 25M 25 | Open cluster | 4.6 | 14.1 |
| NGC 6530NGC 6530 | Cluster with nebulosity | 4.6 | 6 |
| M 23M 23 · NGC 6494 | Open cluster | 5.5 | 16.8 |
| Lagoon NebulaM 8 · NGC 6523 | Nebula | 5.8 | 45 |
| M 21M 21 · NGC 6531 | Open cluster | 5.9 | 6 |
| M 22M 22 · NGC 6656 | Globular cluster | 6.17 | 12.6 |
| M 55M 55 · NGC 6809 | Globular cluster | 6.49 | 12 |
| M 28M 28 · NGC 6626 | Globular cluster | 6.9 | 5.1 |
Facts on this topic will be cited from these primary and reference sources.
Openly-licensed deep-sky catalogue: object types, positions, magnitudes, sizes, morphology, and cross-identifiers.