Log Book Entry No.149

Created: 25 Oct 2017 13:14:14

Last Revised: 25 Oct 2017 13:14:14

LenaLenz1

Solar Limb Darkening Taking Data AC LL

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10:30 dome. Bedingham, Cozens, Lenz

• good weather => took a few images with Canon SLR camera
• The following settings received best results: ISO=100, exposure time=1/4s to 1/8s, max. f-number
• Used rawkit Python package to transform .cr2 files into .tiff
• Applied Hough transformation to find circles in image
• Measured brick width L with ruler and received distance D from dome to boiler house brick via Google Maps
  => L = 22cm, D=104m
• From this calculated angle to be θ = 2*arctan((L/2)/D) = 0.117° = 0.22x(angular separation of sun(0.5°))
• Next steps: - take image of smooth white background to measure the vignetting effect of camera
  - adjust parameters of Hough transformation to find correct circle

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