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