Ptolemy's Cluster (M7)

Posted by SERGIO EGUIVAR
on Sunday, October 16, 2011

Better known as Messier 7, it was mentioned by Greek astronomer Claudius Ptolemaeus about 130 AD.  It is one of the brightest cluster of the sky and it can be seen even from urban cities and also is a good target for binoculars and small telescopes. The cluster contain some 80 stars with a magnitude range from 7 to 12. It is quite close from the centre of our Milky Way therefore the background field full of stars.
M7 with its declination -34 º 49 is the southern object of the Messier list.
The image was taken with a TMB 92 L refractor and QSI WS for a total exposure time of two hours.

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