M9 in Ophiuchus


Scope: C8 at  f/5 Location: Del Mar, CA;   16  Apr. 2005; Camera: ToUcam SC3

Exposure: 20 x 20 sec and 22 x 6 sec exposures with IR filter 15 x 16 sec each RGB exposures.

Processing: Images were captured in K3CCDTools 2. Aligned/stacked in Registax 3 and saved as FITS. Luminance and Color channels were scaled and rough color balanced in IRIS. Channels were co-registered in IRIS. The 20  sec  exposures were used as the base Luminance channel. The shorter Luminance exposure was normal combined with mask to control star size  and desaturate the cluster core in the. L,R,G,B masters were resized to 800 x 600 prior to curves and levels.  Luminance and Color FITS were combined in Photoshop with Luminance Layering. Color balancing and final touches in Photoshop (including background noise subtraction on the Luminance master). SGBNR (PixInsight LE) was used to smooth remaining background noise on the  final result. Final size approximately 800x600.

This image was guided. M9 is a globular cluster located relatively near to the galactic center at about 5000 - 7000 light years. It is about 25,000 light years from our solar system.  There is interstellar dust between this object and our solar system that dims this object somewhat - it lies at the edge of the dark nebula Barnard 64..  Horizontal FOV is 16'

Image center is approximately Equatorial 2000: RA: 17h 19m 12s Dec: -1830'57"


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