M 28 (GC)
Globular Cluster in Sagittarius
| R.A. | Dec. | Size | Mag | SB | Cnt.St | Type | Distance | Chart |
|---|---|---|---|---|---|---|---|---|
| 18h 24m 33.6s | -24° 52′ 10.5″ | 11.2′ | 6.9 | 11.9 | IV | GC | -- | -- |
Source: POSS-2 UK Schmidt Red (STScI) | Field: 15′ × 15′
Background
M28 is a moderately bright globular cluster 17,900 light-years away in Sagittarius, sitting just 1° NW of λ Sgr. Notable for being the first globular in which a millisecond pulsar (PSR B1821-24) was discovered.
My Observing Notes
25-cm (Meade 10-inch LX200, The Coffee Grinder): 2° NW of λ Sgr; viewfinder picks up a faint smudge. Smaller than its neighbour M22, with only a few brighter stars resolved at this aperture. The core remains a diffuse mass of unresolved stars.(Friday, May 2025)
References
Charts
Ultra-wide view (~25° field)
Wide-field view with Telrad rings (4°, 2°, 0.5°)
Finderscope view (9×50 RACI, ~4.4° TFOV)
Eyepiece view — 35 mm Panoptic on 12-inch f/5 (1.6° TFOV)