M3 in Canes Venatici



Scope: C8 f/6.6; Location: Del Mar, CA;  10 May. 2005; Camera: Artemis285

Exposure: 7 x 120 sec and 7 x 60 Luminance exposures (bin 1x1)with Baader IR Block Filter; 6 x 45 sec RGB (bin 2x2)

Processing: Images were captured Artemis Capture (as FITs). 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 120 sec exposures were used as the main luminance with some blending in the core area of the 60 sec Luminance exposures. Final LRGB combine was done in Photoshop using Luminance Layering (or LLRGB). Minor star repair was made on edge stars (focus was less then optimal - there was some coma). Color balancing and final touches in Photoshop. SGBNR was used to smooth background noise on the luminance channel. Final Image size is approximately 1392x1040

This image was first light with the Artemis285 on loan. The image was taken with fairly good conditions at a light polluted site. This is a guided image. As mentioned in the processing, the focus was off (hey, it was my first use of the camera). But with a little star repair, the image was salvageable. M3 is one of the more outstanding globular clusters - it contains an estimated half million stars and is estimated to be about 34,000 light years distant. This image replaces an earlier image that can be seen in the Archives here. Horizontal FOV is 24'

Object Center is approximately - Equatorial 2000: RA: 13h 42m 11s Dec: +2822'34"


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