Messier 28
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| Globular cluster | List of globular clusters |
|---|---|
| Observation data (Epoch J2000) |
|
| Class | IV |
| Constellation | Sagittarius |
| Right ascension | 18h 24m 32.89s[1] |
| Declination | -24° 52′ 11.4″[1] |
| Distance | 18.3 kly (5.6 kpc) |
| Apparent magnitude (V) | +7.66[1] |
| Apparent dimensions (V) | 11′.2 |
| Physical characteristics | |
| Mass | ( M☉) |
| Radius | 30 ly[2] |
| VHB | |
| Estimated age | |
| Notable features | Contains pulsar |
| Other designations | M 28, NGC 6626, GCl 94[1] |
Messier 28 (also known as M28 or NGC 6626) is a globular cluster in the constellation Sagittarius. It was discovered by Charles Messier in 1764.
M28 is at a distance of about 18,000 to 19,000 light-years away from Earth. 18 RR Lyrae type variable stars have been observed in this cluster. In 1987, M28 became the second globular cluster where a millisecond pulsar was discovered (the first was Globular Cluster M4).
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