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Transit of Venus - 8th June 2004, 





    
        

            Tony Cook

Transit of Venus - 8th June 2004

Technical card

Imaging telescope or lens:Televue TV-85

Resolution: 1007x1000

Date:June 8, 2004

Time: 05:20

Description

A composite image of the whole transit of Venus in hydrogen alpha light taken just north of Paphos, Cyprus

The main solar disk image was taken just after first contact at 05h 20m UT (08h 20m local time). The large prominence erupted between first and second contact and completely dissipated by second contact. The first image of Venus is just after second contact at 05h 40m UT (08h 40m local time). The middle (3rd) image of Venus is at 08h 21m (11h 21m local time). The final (5th) image of Venus was taken at 11h 03m UT (14h 03m local time).

The equipment used: Losmandy GM-8 mount (counter weight was a bag of stones!), Televue 85, Coronado SM60 hydrogen alpha filter, Canon 10D.

The key times (UT) at the Paphos location were:

1st contact : 05h 19m 34s
2nd contact: 05h 39m 02s
3rd contact: 11h 04m 00s
4th contact: 11h 23m 11s

Exposures of 1/90s, 1/20s, 1/6s and 1/2s were taken at ISO 100 to cover the solar disk and dim prominences. All data was extracted from the green channel as monochrome images. The long exposures where mapped in Images Plus to the red channel, medium exposures to green and the shortest exposure to the blue channel to create a synthetic coloured image (forming a "hot metal" pallet comprising only of the colours black -> red -> orange -> yellow -> white)

The green and blue channels were corrected with a pseudo flat to smooth the blend at the edge of the solar disk with the data in the red channel. The final processing was the application of 10 iterations of adaptive Richardson-Lucy deconvolution for some edge sharpening.

Comments

Author

Tonk
Tony Cook
License: Attribution-NonCommercial-NoDerivs Creative Commons
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Transit of Venus - 8th June 2004, 





    
        

            Tony Cook

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