M28 (NGC 6626) Observation Guide — Globular Cluster in Sagittarius

Overview

M28 is a globular cluster in Sagittarius, catalogued as NGC 6626. At Magnitude 6.8, it lies roughly 19,000 light-years away. Summer brings it to prime position, and the cluster is best suited to intermediate observers.

Globular clusters are dense, spherical stellar systems containing hundreds of thousands to millions of stars. They inhabit the halo of the Milky Way and rank among the oldest objects known.

Basic Data

Physical Characteristics

M28 shines at Magnitude 6.8 from about 19,000 light-years away. Its interior contains many ancient red giants, and the cluster's age is estimated at over 10 billion years.

Observation Guide

Finding It

M28 lies within Sagittarius. Summer evenings around 8–10 PM place it at a useful elevation in the south. Use Sagittarius's main stars as reference points, then narrow down the position with a star chart or app.

Tips for Observing

The contrast between the compressed core and the loosely scattered outer halo is the visual centerpiece. More aperture means more individual stars resolved across the cluster.

Recommended Equipment

Binoculars or a small telescope with 60 mm or more aperture work well.

Astrophotography Tips

Prime focus photography through a tracking telescope is the standard method. Choose an exposure that preserves detail in the bright core while reaching the fainter outer stars.

Summary

M28 is an intermediate-level globular cluster in the rich star fields of Sagittarius — a rewarding summer target.