Sagittarius_Carina Arm – Ptolemy’s Cluster

I know that I am mortal and the creature of a day;

but when I search out the massed wheeling circles of the stars,
my feet no longer touch the earth, but, side by side with Zeus himself,
I take my fill of ambrosia, the food of the gods

Ptolemy
 
Ptolemy's Cluster NGC 6475, Messier 7 (Top image to right of Antares)
This cluster was known to Ptolemy, who mentioned it about 130 AD and described it as the “little cloud following the stinger of Scorpius.
Messier 7 is a huge open cluster, plainly visible to the naked eye as a concentrated patch in the Milky Way.
The cluster's estimated distance is 800-1000 light years, and has an actual diameter of 18-25 light years. It has a luminosity of 2,500 suns, and it is approaching us at 14 km/sec.

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Exif:
Imaged 11 October 2012

Canon EOS 7D – Piggy Backed on Celestron CPC
Focal Length – 105mm
Exposure – 120sec
ISO 1600


 


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