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Small Refractor CCD Imaging

Small Refractor CCD Imaging. David Haworth http://www.stargazing.net/david/. Agenda. Equipment Imaging session Image processing Advantages Disadvantages. Equipment. CCD Cookbook CB245 camera Orion ShortTube™ 80mm refractor 400mm Focal length 13 x 10 arc second/photosite

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Small Refractor CCD Imaging

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  1. Small Refractor CCD Imaging David Haworth http://www.stargazing.net/david/

  2. Agenda • Equipment • Imaging session • Image processing • Advantages • Disadvantages

  3. Equipment • CCD Cookbook CB245 camera • Orion ShortTube™ 80mm refractor • 400mm Focal length • 13 x 10 arc second/photosite • Piggy back on Celestron CG-11 Schmidt-Cassegrain telescope

  4. CCD Cookbook CB245 Camera Interface to PC Water Cooling Spectra Astro Systems Shutter Camera Head

  5. IR Filter to Reduce Focusing Problem CCD IC Santa Barbara Instrument Group IR Filter in T-mount extension tube Spectra Astro Systems Shutter

  6. Monitoring CCD Temperature CCD IC Thermistor mounted on CCD IC Typical  from water = 62°F

  7. Spectra Astro Systems Shutter Shutter for Taking Dark Frames

  8. CCD Cookbook CB245 Camera T-ring with IR Filter Spectra Astro Systems Shutter

  9. CCD Cookbook CB245 Camera Mountedon Orion ShortTube Refractor CCD Camera T-ring Camera Support

  10. T-ring Camera Support

  11. Orion Piggy Back on Celestron CG-11

  12. Imaging Session • On the driveway observing • Reducing setup & tear down time • Typical imaging session • Dark frames • Multiple images

  13. Telescope is Setup on a Dolly

  14. Telescope is Lifted on Blocks

  15. Astro Trailer

  16. Computer Ready to Control the Camera

  17. Ready for Night Time Imaging Roll a way Table With Dew Cover Astro Trailer CCD Cooling Water

  18. Cooling the CCD Camera Water Thermometer Open System Cooling Water Water Pump (12VDC)

  19. Quick Disconnect Water Hoses

  20. Image Processing • Richard Berry's software • Multi245: calibration & stacking • CB245: Kunihiko Okano's Digital Development functions

  21. Multi245: Stacking Multiple Images One 15 Seconds Image 31 - 15 Seconds Images

  22. CB245: Kunihiko Okano's Digital Development M13 Without With

  23. Image Processing • Software Bisque CCDSoft CCD Astronomy software • Brightness & contrast adjustment, rotating image, resampling the image to correct aspect ratio and saving the image as a JPEG file • JASC Paint Shop Pro software • Image cropping & creating mosaics

  24. CCDSoft - Aspect Ratio ResamplingM42 242 x 252 187 x 252

  25. Paint Shop Pro - Crop Star Blooming M37 Uncropped Cropped

  26. Paint Shop Pro - M31, M32 & M110 Mosaic M32 M110

  27. Advantages • Large field of view • 55 x 41 arc min. vs. CG-11 12 x 9 arc min. • Large object imaging • M8, M33, M42, M78, etc. • Finding objects is easier • Reduced polar alignment errors effects • Reduced tracking errors effects

  28. Large Field of View 41 x 55 arc min. M33 M78

  29. Large Field of View 41 x 55 arc min. M81 & M82 Horsehead B33

  30. M11 & Dark Nebulas

  31. M8 M17

  32. Disadvantages • Small objects do not image very well • M57, M72, M75, M76, etc. • Small 80mm aperture

  33. Small Objects do Not Image Very Well M57 M76

  34. Small 80 mm Aperture NGC7331

  35. Zoom in NGC7331 14.7 ? 16.9 15.2 14.5 10.3

  36. STScI Digitized Sky Survey (DSS) 48-inch NGC7331 ?

  37. Other Images • 70 Messier objects • ITS ‘99 CD-ROM • http://www.stargazing.net/david

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