Messier 28. NGC 6626

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Messier 28 is a small (50,000 stars), not very distant (18,000 light years) globular cluster. The constellation Sagittarius hosts a great deal of Messier objects (14, half of them are globulars), being M28 one of them. Usually, the globular clusters have some RR Lyrae stars (variable stars that are useful to calculate distances. This is also the case in M28, which contains 18 of them. A peculiar feature is that M28 has 12 millisecond pulsars with periods lower than 10 milliseconds.


Additional Information


Name(s): Messier 28. M28. NGC 6626

Type: Globular Cluster

RA:  18h 24m 32s

Dec: -24º 52’ 06”

Constellation: Sagittarius

Size (arcmin): 12×12 arcmin

Magnitude: +7.7

Distance: 18,000 ly


Date: 2021-05-23

Location:, SSO near Coonabarabran, NSW Australia

Size (arcmin): 28×20 arcmin

Telescope: 20” f/4.5 Reflector

Camera: FLI PL6303E (3072x2048pix)

Guiding: Astrodon MonsterMOAG off-axis guider

Total exposure: 3 hours (LRGB, 45 min each)

Processing: CCDStack, Photoshop CC 2021

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