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Artemis 285

Artemis 285. Simon Dawes. Kit. Assembly. The Completed Camera. Problem 1. Thermal readout noise. Solution: New Peltier More thermal paste on peltier (although Dark subtraction was quite effective). Problem 2. Dust donuts!.

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Artemis 285

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  1. Artemis 285 Simon Dawes

  2. Kit

  3. Assembly

  4. The Completed Camera

  5. Problem 1 Thermal readout noise • Solution: • New Peltier • More thermal paste on peltier (although Dark subtraction was quite effective)

  6. Problem 2 Dust donuts! Solution:Flat fielding Light box(although they can sometimes be removed with clever processing)

  7. Problem 3 & 4 Gradient from top left to bottom right Solution: Turn off Amp during exposure(Latest software always selects this for long exposures) Weird patterns! – Dew on CCD Solution: Seal the cold frame, desiccant was tryingto dry the whole Earth! CCD was dripping wet

  8. Problem 5(will they ever stop) Another weird pattern! - Frost Solution: Thermal paste sealing CCD window, to warm the window slightly

  9. Flat field light box

  10. Raw 15s Frame, note top-bottom gradient and dust donuts

  11. Stacked, dark subtracted, cube route scaled, de-convolved

  12. Notice dust donuts (poor flat field) and sky gradient going from top left to bottom right

  13. Median rank operator removes small scale structure, leaving the sky gradient, donuts and Globular

  14. 19,000 is added to every pixel in original image

  15. One Image is subtracted from the other, removing gradient and donuts

  16. Background is smoothed to remove some noise

  17. Any pixel value less than 21,000 ADU is set to 17,000ADU

  18. Black and white levels are adjusted

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