British Astronomical Association
Supporting amateur astronomers since 1890

Secondary menu

Main menu

BAA Community



Expand image

About this observation
john simpson
Time of observation
20/01/2018 - 21:00
Polarisation Standard Stars
Observing location
SW Scotland
Celestron C6
Wollaston Prism
Cousins V-Band filter
ATIK 314L+
Various depending on target

Polarisation measurement - an itch I have wanted to scratch for some while. Graph shows calibrations in V-Band against various 'zero' and 'high' polarisation standard stars [plus a few others]. Four images taken of each target at 0, 45, 90, 135 deg. rotation angles. The Wollaston separates the target into 'ordinary' & 'extraordinary' images and these are processed to derive Stokes Q & U and thence polarisation magnitude and angle. My hope eventually with bigger telescope & light grasp is to couple to my ALPY.

Copyright of all images and other observations submitted to the BAA remains with the owner of the work. Reproduction of the work by third-parties is expressly forbidden without the consent of the copyright holder. For more information, please contact the webmaster.