Difference: LogBookAstronomyEntry0149 ( vs. 1)

Revision 125 Oct 2017 - LenaLenz1

Line: 1 to 1
Added:
>
>
META TOPICPARENT name="LogBookAstronomy"

Log Book Entry No.149

Days, Calendar Created: 25 Oct 2017 13:14:14 Days, Calendar Last Revised: 25 Oct 2017 13:14:14 Person LenaLenz1 Text Solar Limb Darkening Taking Data AC LL

<-- 
Please DO NOT alter or remove the line below this line. 
  • Set EDITMETHOD = wysiwyg
Please DO NOT alter or remove the line above this line. -->

IDEA! Please edit and put your text etc. here

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

Back to: LogBookAstronomy

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
 
This site is powered by the TWiki collaboration platform Powered by PerlCopyright © 2008-2021 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding RHUL Physics Department TWiki? Send feedback