Messier 28

Observation Notes:

At 37X, this globular cluster is small, but still easily visible. I didn’t see any granularity at this magnification. The nucleus was circular and tight, but not stellar. At 120X, granularity was still hard to come by. About 7 or 8 stars were blinking in and out across the surface. The fall off in brightness seemed softest to the NE.


At a distance of 18 to 19,000 light years, M28 has a diameter of 60 light years. It was the second globular cluster that was discovered to contain a millisecond pulsar–this pulsar spins around its axis once every 11 milliseconds. M28 was discovered by Charles Messier in 1764.

Subject M28/NGC 6626
Classification Globular Cluster
Position Sagittarius [RA: 18:24.5 / Dec: -24:52]*
Size* 11.2′
Brightness* 6.8
Date/Time 10/14/04 – 8:05 PM
Observing Loc. Flagstaff, AZ – Home
Instrument Orion SVP 6LT Reflector (150 mm dia./1200 mm F/L)
Eyepieces/Mag. 32 mm (37X), 10 mm (120X)
Seeing 3/10
Transparency Mag 5.8

* Based on published data.