Messier 9. NGC 6333

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Messier 9 is a faint globular cluster located in the constellation Ophiuchus. At a distance of about 5,500 light years from the center of the Milky Way and 25,800 light years from us, Messier 9 has a visual magnitude of +8.4 and more than 250,000 stars in it. The total luminosity is 120,000 that of our Sun. As usual with globular clusters, its metallicity (the presence of elements heavier than Helium) is very low due to the fact that many stars were formed in the early stages of our Universe. Messier 9 has an age pf approximately 12 billion years.


Additional Information


Name(s): Messier 9, M9, NGC 6333

Type: Globular Cluster

RA:  17h 19m 10s

Dec: -18º 30’ 51”

Constellation: Ophiuchus

Size (arcmin): 12 arcmin

Magnitude: +8.4

Distance: 25,800 light years


Date: 2021-04-20 and 2021-04-21

Location:, SSO near Coonabarabran, NSW Australia

Size (arcmin): 41×41 arcmin

Telescope: 17” f/6.8 Reflector

Camera: FLI PL16803 (4096x4096pix)

Guiding: N/A

Total exposure: 4h 40m (L: 80 min; RGB: 3h 20m)

Processing: CCDStack, Photoshop CC 2021

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