META TOPICPARENT |
name="LogBookAstronomy" |
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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META FORM |
name="%25SYSTEMWEB%25.LogBookForm" |
FORM FIELD Subject |
Subject |
Solar Limb Darkening Taking Data AC LL |
FORM FIELD Status |
Status |
blank |
FORM FIELD Author |
Author |
LenaLenz |
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