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Ptolomy's Cluster in Scorpio - by Mike O'Day ( https://500px.com/MikeODay ) | by Mike O'Day
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Ptolomy's Cluster in Scorpio - by Mike O'Day ( https://500px.com/MikeODay )

Ptolemy's Cluster in Scorpio ( Messier 7, NGC 6475 ).

 

Visible to the naked eye as a small bright patch in the sky, this open cluster is around 980 light years away with around 80 stars within a area of 25 light years or so.

 

Links:

 

500px.com/MikeODay

photo.net/photos/MikeODay

 

Details:

 

RA 17h 54m, Dec -34deg 47'.

Skywatcher Quattro 10" f4 Newtonian.

Skywatcher AZ Eq6 GT Mount

Orion auto guider - PHD2.

Baader MPCC Mark 3 Coma Corrector.

Nikon D300 (unmodified).

Field of view (deg) ~ 1.35 x 0.90.

18 x 30 sec ISO800.

23 May 14

 

Reprocessed Pixinsight 8 Sep 2015

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Uploaded on September 8, 2015