Waid Observatory

Object: M28 - Globular Cluster in Sagittarius
Date: July 26-27, 2024   -   Location: Dark Sky Observatory, Fort Davis, TX
Telescope:   16 in. RC   Mount:  Paramount ME II   Filters:   Chroma LRGB
Camera: FLI 16803   Exposure: L = 30x60s   R = 28x60s G&B = 30x60s each

Click on the image to view at higher resolution.
Scroll down to view the object's description.


 
m28

M28 - Globular Cluster in Sagittarius

Discovered by Charles Messier in 1764[1].

M28, also designated NGC 6626[1], is a dense cluster of stars.  This type of astronomical object is classified as a globular cluster and typically is composed of thousands of stars.  M28 has an estimated population of at least 50,000 member stars[2].  The cluster lies in the constellation of Sagittarius approximately 18,300 light years from the Earth[1].  M28 is classified as a class IV globular star cluster[2].

M28 was the first globular cluster discovered to contain a millisecond pulsar[1,2].  This pulsar (PSR B1821-24)[2] was discovered in 1986 using the Lovell radio telescope in England[2]

1Wikipedia: https://en.wikipedia.org/wiki/Messier_28
2Messier Objects: https://www.messier-objects.com/messier-28/

 
Copyright Donald P. Waid