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photometry - Coggle Diagram
photometry
Photometry
Aperture Photometry
estimate background
mode count
PSF
substract
count photon
Difference Image Photometry
PSF matching
intensity matching
precise (subpixel) alignment
CCD/CMOS
CCD: charge-coupled device
CMOS: Complementary metal–oxide–semiconductor
extended source photometry
SNR
noise
dark current
read noise and digitization error
Sky
Snet = (S+B) – Bestimated – dark + ϵ
SNR=Snet-√S
σB^2=B*ns^2/nb^2
Nd=dark current
S=Stotal+σB^2+Nd+ns*Nr
Nr=read noise
Signal-to-Noise Ratio
Magnitude
M=C-2.5lgN+2.5lgt
F=N/t
Differential photometry
instrumental zero point magnitude
Mt(target)-Mt(standard) = Mi(target) - Mi(standard)
complications
Atmospheric extinction
x=secz
mins=m--kx
Instrumental to Standard Magnitudes