NGC 4833, Caldwell 105


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NGC 4833 is a globular cluster that was discovered as early as 1751, by Abbé Lacaille. It is located in the constellation Musca in a dust rich region. This obscures it, but it is still a 6.9 magnitude cluster. This is an old cluster, slightly older than other popular clusters like M5 (itself about 13 billion years old…). In September 2000, J. Melbourne published that NGC 4833 has been determined to be 2 billion years older than M5, but this would contradict the age of the Universe. The bright star on the upper left of the cluster belongs to our galaxy.

Additional Information


Name(s): NGC 4833, Caldwell 105

Type: Globular Cluster

RA:  12h 59m 34s

Dec: -70º 52’ 29”

Constellation: Musca

Size (arcmin): 5×5

Magnitude: +6.9

Distance: 22,000 ly


Date: 2016-07-03 thru 2016-07-17

Location:, SSO near Coonabarabran, NSW Australia

Size (arcmin): 37×37

Telescope: Planewave CDK 20” f/6.8

Camera: SBIG STX16803 (4096x4096pix)

Guiding: Astrodon MonsterMOAG off-axis guider

Total exposure: 7 hours (L: 5x15min; RGB: 23x15min) all Bin 1×1

Processing: CCDStack, Photoshop CC 2016 and PixInsight

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