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SKY BACKGROUND CALIBRATION and CORRECTION

SKY BACKGROUND CALIBRATION and CORRECTION. José Eduardo Costa. Correction by Sky Background. Standard procedure Correction: STAR – SKY. CoRoT Sky Background Windows. SISMO (1s): 5 windows / CCD 50x50 EXO (32s): 10 windows / CCD 10x10 EXO (512s): 40 windows / CCD 10x10.

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SKY BACKGROUND CALIBRATION and CORRECTION

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  1. SKY BACKGROUND CALIBRATION and CORRECTION José Eduardo Costa

  2. Correction by Sky Background • Standard procedure • Correction: STAR – SKY

  3. CoRoT Sky Background Windows • SISMO (1s): 5 windows / CCD 50x50 • EXO (32s): 10 windows / CCD 10x10 • EXO (512s): 40 windows / CCD 10x10

  4. Sky Background SKY BACKGROUND = ADJACENT SKY + PARASITE LIGHT PARASITE LIGHT: • Straylight from the Earth • SAA • Moonlight • Other sources of light • Diffusion and reflection

  5. Straylight From Earth • h = 896 km • P = 1h 42.9min • f = 162 uHz

  6. Straylight and Orbital Position

  7. South Atlantic Anomaly (SAA)

  8. Effects on SISMO and EXO SISMO EXO

  9. Corrections of the Sky Background • Correction On Board Outline points (cosmic rays) • Correction On Ground Outline points, SAA and Discontinuity Sky Background Gradient

  10. Correction On Board

  11. Correction of Outline Points and Discontinuity

  12. Asymmetrical Optical System

  13. Non-Homogeneous Sky Background

  14. Residual Sky Light Curve

  15. SBC Program

  16. Modelization of the Sky Background Gradient

  17. Sky Background Characterization f(x,y) = cte Homogeneous Sky Background Regular f(x,y; t) Non-homogeneous Irregular Local Triang.

  18. Irregular Sky BackgroundLocal Triangularization

  19. SBC – Sky Background Gradient

  20. Thank you

  21. Zodiacal Light (scattering of the solar light by thin particles of dust)

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