m7

Deep Sky
M7
NGC6475

Ptolemy Cluster
Constellation: Scorpius
This is an open cluster in located pretty close to the stinger of the constellation.  This open cluster has been known for a very long time, records show it was recorded by Ptolemy, a Greek-Roman astronomer in the 1st Century, more specific 130 AD. Messier recorded it as the 7th member of his list.
There are about 80 stars within the field of view making up this cluster, they are approx 960 light-years from earth, and diameter of some 25 light-years.  M7 is thought to be about 200 million years old.  As you can see, it is in our Milky Way.


10 images
20 sec
date: 9-15-12