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SKY BACKGROUND CALIBRATION and CORRECTION

This document outlines the methods for calibrating and correcting sky background in astronomical observations. It details the standard procedures used in the CoRoT and SISMO projects, covering different time windows and CCD parameters. Key aspects include managing stray light from sources like the Moon and the South Atlantic Anomaly (SAA). The correction process involves addressing non-homogeneous sky backgrounds and cosmic ray impacts, aiming to achieve a more accurate measurement of celestial objects. Techniques for modelization and triangulation of irregular sky backgrounds are also discussed.

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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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