NGC 1746 - NGC 1750 and NGC 1758
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Scope: Zenithstar 66 mm APO mm at f/4.7 Location: Dos Picos Park, Ramona, CA 12 December 2010 Camera: Artemis285
Exposure: 11 x 1 min and 11 x 3 min Luminance with IR Block Filter (bin 1x1); 7 x 3 min RGB (1x1 bin)
Processing: Images were captured with Artemis Capture (as FITs). Aligned/stacked and dark subtracted in Astroart with Sigma Combine. IR / UV Blocking filter and Color channels were scaled and color balanced in Astroart. Channels were co-registered in Astroart. Central gradient removal was performed in Astroart. Luminance channel consisted of the IR/UV blocking filter exposures. Curves and Levels applied in Photoshop to the Luminance channel to optimize star depth. Final LRGB combine was done in Photoshop using Luminance Layering. Final Image size is approximately 1600 x 1195.
North is up in this image. NGC 1746 is designated an open cluster in the NGC, but it has been determined to be an optical grouping rather than a true open cluster. NGC 1746 is the conglomeration of larger stars taking up much of the field. However, there are two other clusters, NGC 1750 and NGC 1758. They are left of center are apparently overlapping, but they do not interact gravitationally since they are estimated to be about 420 light years apart. NGC 1750 and NGC1758 are about 2,053 and 2,477 light years distant from Earth. Horizontal FOV is 100'
Image center is approximately - Equatorial 2000: RA: 05h 03m 17s Dec: +23°49'17"
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