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M3 is one of the beautiful and
brightest globular cluster in the sky. M3 is in the Canes Venatici
constellation. This image show the different colors of many stars, from
blue to orange.
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| Optics | Newton 310mm
Maccagnan |
| Focal Lenght | 1560mm |
| Focal Ratio | f/5 |
| Exposure Time and filters | LRGB 16:6:6:6
(single
exposures of 2 min), total exposure 34m |
| CCD | FLI ME2 |
| Sensor | Kaf-402me grade 2 |
| Chip temperature | -34°C |
| Location | Tradate (VA, in Pianura Padana, Italy) at 300m |
| Date and time of exposure start | 30 december 2005, 6.24 UT |
| Mount | Gemini G41 |
| Tracking | ST4 with
Pentax 75 at 1000mm |
| Temperature and humidity | T=-10°C, RH=30% |
| Notes | |
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