Log Book Entry No.150

Days, Calendar Created: 01 Nov 2017 13:28:40 Days, Calendar Last Revised: 23 Jan 2018 19:30:36 Person AlanisCozens1 Text Solar Limb Darkening test data AC LL

Time 10:30am-1pm in dome, A Cozens, L Lenz, D Bedingham, S Boogert

Weather cloudy, intermittently clear
use DSLR to take white images to look at the natural vignetting effects of the camera, took many exposure times so to get an unsaturated image. Need to process these to get a pixel vs intensity curve to show that the fractional ratio of intensity does not depend on exposure. Also look at different colour channels and create a plot to show all 3
Then set up the telescope so as to record data, fit with sun filters and imaging source camera. Using ICcapture software.
Use shadow of the telescope to align, and adjust further with finder scope.
set telescope to the west of the sun to see it passing through the window, takes around 1min to fully pass no data recorded
Use DSLR to take images of the sun, lowering the exposure times to find an unsaturated image. Use circle finder code to analyse the intensity array across a diameter of the sun.

Attached Text files show the image numbers on the DSLR for varying exposure times ISO=100 for targets of the sun then a white light source evenly lit for investigating the vignetting effect.


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Subject Solar Limb Darkening test data AC LL
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Topic attachments
I Attachment History Action Size DateSorted ascending Who Comment
Compressed Zip archivezip data.zip r1 manage 79828.0 K 01 Nov 2017 - 13:38 LenaLenz1 images of Sun with Canon DSLR camera
Compressed Zip archivezip data2.zip r1 manage 70668.7 K 01 Nov 2017 - 13:47 LenaLenz1 images of Sun with Canon DSLR camera
Compressed Zip archivezip data3.zip r1 manage 50952.0 K 01 Nov 2017 - 13:51 LenaLenz1 images of Sun with Canon DSLR camera
Compressed Zip archivezip white_background.zip r1 manage 71771.8 K 01 Nov 2017 - 13:53 LenaLenz1 white background images vignetting effect
Compressed Zip archivezip white_background2.zip r1 manage 50540.0 K 01 Nov 2017 - 14:08 LenaLenz1 white background images vignetting effect
Texttxt convert_raw.py.txt r1 manage 1.2 K 01 Nov 2017 - 14:21 LenaLenz1 code to convert raw data to tiff
Compressed Zip archivezip Vignetting1.zip r1 manage 84841.8 K 14 Nov 2017 - 13:42 LenaLenz1 Correct updated vignetting images
Compressed Zip archivezip Vignetting2.zip r1 manage 77559.7 K 14 Nov 2017 - 13:43 LenaLenz1 Correct updated vignetting images
Texttxt SUN_100_EXPVARY.txt r1 manage 0.3 K 23 Jan 2018 - 19:11 AlanisCozens1 Image numbers for varying exposure times Target:SUN ISO:100 DSLR
Texttxt VIGNETTE_100_EXPVARY.txt r1 manage 0.2 K 23 Jan 2018 - 19:30 AlanisCozens1 Image numbers for varying exposure times Target:VIGNETTE ISO:100 DSLR

This topic: Public > UserList > StewartBoogert > StewartBoogertAstronomy > LogBookAstronomy > LogBookAstronomyEntry0150
Topic revision: r4 - 23 Jan 2018 - AlanisCozens1
 
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