sky background calibration and correction
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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SKY BACKGROUNDCALIBRATION and CORRECTION
José Eduardo Costa
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Correction by Sky Background
● Standard procedure
● Correction: STAR – SKY
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CoRoT Sky Background Windows
● SISMO (1s):5 windows / CCD50x50
● EXO (32s):10 windows / CCD10x10
● EXO (512s):40 windows / CCD10x10
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Sky Background
● Straylight from the Earth● SAA● Moonlight● Other sources of light● Diffusion and reflection
SKY BACKGROUND = ADJACENT SKY + PARASITE LIGHT
PARASITE LIGHT:
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Straylight From Earth
● h = 896 km● P = 1h 42.9min● f = 162 uHz
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Straylight and Orbital Position
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South Atlantic Anomaly (SAA)
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Effects on SISMO and EXO
SISMO
EXO
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Corrections of the Sky Background
● Correction On BoardOutline points (cosmic rays)
● Correction On GroundOutline points, SAA and
DiscontinuitySky Background Gradient
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Correction On Board
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Correction of Outline Points and Discontinuity
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Asymmetrical Optical System
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Non-Homogeneous Sky Background
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Residual Sky Light Curve
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SBC Program
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Modelization of the Sky Background Gradient
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Sky Background Characterization
Sky Background
Homogeneous
Non-homogeneous
Regular
Irregular
f(x,y) = cte
f(x,y; t)
Local Triang.
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Irregular Sky BackgroundLocal Triangularization
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SBC – Sky Background Gradient
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Thank you
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Zodiacal Light
(scattering of the solar light by thin particles of dust)