SOCO IMAGE GALLERY


 

IC 4665        

IC 4665 is a large open cluster lying just off the eastern shoulder of Ophiuchus. With an apparent diameter of 0.7 degree and containing 20-or-so magnitude 6 to 8 stars, this cluster is an ideal target for binocular viewing. Due to the size of this object, I had to create a mosaic of two images to completely contain the cluster. With a visual magnitude of 4.2, it can easily be seen with the naked eye under clear sky conditions against the backdrop of the western branch of the Summer Milky Way. Most of the brighter stars in this cluster are young blue-ish spectral class B supergiants. The one exception is the 8th-magnitude orange supergiant TYC 424-867-1 located toward the bottom part of the main cluster. The cluster is thought to be only around 40 million years old, and lies at a distance of around 1400 LY.
IC 4665 was discovered by Philippe Loys de Cheseaux in 1745.

Date(s) Acquired: 23, 24 June 2016
Telescope: Orion 120mm EON Apochromatic Refractor
Camera: QSI Model 583 with Optec NextGEN Ultra Widefield 0.7X Telecompressor

 

   Exposure Time (min) 
   Number of Exposures
   RGB
   1
   Hα
   -
   Hβ
   -
   OIII
   -
   RGB
   2*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.
Images mosaiced using Adobe Photoshop.




 

 

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