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NGC 7209    

NGC 7209 is a sparse open cluster located along the edge of the Winter Milky Way in the constellation Lacerta. Lacerta doesn't contain a lot of visually impressive astronomical objects, but this cluster is one of the nicer ones in it. Visually, it has a diameter of around 15 arc-min and a magnitude of 7.7. It contains around 100 member stars and lies at a distance of 3000 LY. There is some question whether NGC 7209 is a single cluster or the superposition of two clusters located at distances of 2500 and 3800 LY. A notable feature of this cluster is that it contains the 10th-magnitude variable star SS Lacertae. This is an eclipsing binary star that in the mid-1900's stopped eclipsing. The reason is not known with certainty, although it is thought that a third stellar member of the system changed the plane of the orbits of the eclipsing pair so that we no longer see one pass in front of the other.

Date(s) Acquired: 17 December 2015
Telescope: Orion 120mm EON Apochromatic Refractor
Camera: QSI Model 583

 

   Exposure Time (min) 
   Number of Exposures
   RGB
   1.5
   Hα
   -
   Hβ
   -
   OIII
   -
   RGB
   16
   Hα
   0
   Hβ
   0
   OIII
   0

 

Processing:
Master red, green, and blue images created using SuperSIAM.
Color composite image created using Basic Processing Procedure III.
Color composite image contrast-stretched using Adobe Photoshop.




 

 

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