NGC 104 – Caldwell 106


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NGC 104 is the second brightest globular cluster in the sky. It is second only to NGC 5139, the Omega Centauri cluster. Also being called 47 Tucanae, NGC 104 is an easy object for any telescope (even visible with the naked eye). Globular Clusters have many more stars than open clusters. This one is no exception to the rule and it contains about one million stars, some of which are x-ray binary systems.

A recent search for exoplanets with the Hubble Telescope (with no detections on 34,000 stars), led to the conclusion that these bodies are rare or absent in globular clusters, probably due to the absence or low concentration of heavy elements. This cluster is, angularly, very close to the Small Magellanic Cloud.

Additional Information


Name(s): NGC 104, 47 Tuc, Caldwell 106

Type: Globular Cluster

RA:  00h 24m 03.7s

Dec: -70ΒΊ 04’ 58.8”

Constellation: Tucana

Size (arcmin): 30

Magnitude: +3.5

Distance: 15,000 ly


Date: 2014-08-02

Location: SSO near Coonabarabran, NSW Australia

Size (arcmin): 37×24

Telescope: Planewave CDK 20” f/4.5

Camera: FLI PL6303 (3072x2048pix)

Guiding: not recorded

Total exposure: 42 min (L: 10.5min; RGB: 31.5min)

Processing: CCDStack, Photoshop CC 2016 and PixInsight

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