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photometry - Coggle Diagram
photometry
tools
CCD
CMOS
lower power requirements
parallel processing
high noise
rolling shutter
difference image photometry
extended source photometry
point source
SNR
noise = sqrt(signal)
dark current
read noise and digitization
estimated sky
source and sky underneath
SNR = (S - B - D + E)/(sqrt(S+(δB)^2+Nd+nNr^2))
atmospheric extinction
MI = m - kx
C0 = C - kx
method
aperture photometry
source photons
background count
use mode
annulus away from source but stay local.
gaussian model for PSF
calibrate to magnitudes
MT(target)-MT(standard)=MI(target)-MI(standard)