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Jupiter Image 2019/07/06(UT)
大杉忠夫,安達 誠
Vincenzo della Vecchia,Luigi Morrone,Efrain Morales Rivera,Mark Lonsdale,Michael Wong,Clyde Foster,Paul Maxson
T.Ohsugi,V.della Vecchia,L.Morrone,E.Morales,M.Lonsdale,M.Wong,C.Foster,M.Adachi,P.Maxson
≪石川県小松市 大杉忠夫≫[Tadao Ohsugi:Komatsu city Ishikawa pre,Japan]
Jupiter and Io transit in stable air conditions. The satellite is close to Central Meridian.
A spot is visibile in South Polar Region at very low latitudes.
[Vincenzo della Vecchia : [Aversa,Italy]
[Luigi Morrone : City Agerola Italy]
[Efrain Morales Rivera Aguadilla:Puerto Rico]
[Mark Lonsdale : [Canberra,Australia]
[Michael Wong,Hong Kong,China]
A special privilege for me. The Jupiter image (RGB colour) that we captured with the historic (Alvan Clark 1887) Boyden Refractor last weekend at Boyden Observatory,Bloemfontein.
I have read in an old article that the main lens was designed to be installed in two different ways.
One optimised for visual observation and the second for photographic.
It was clear during processing that the Green wavelength appeared to be the best,so I am fairly certain that the lens is currently installed for visual observation.
Red was not quite as good as the Green,and the Blue showed some scattering (this may well be improved in the "photographic mode"),
which made the colour balance a bit tricky (I just hope I have done the instrument justice).
I had to manually focus (a bit of a challenge!),
whilst being assisted by Prof Matie Hoffman of the University of the Free State who managed the drive system.
[Clyde Foster:Centurion,South Africa]
時々、薄雲が上空を通過して、観測中に暗くなる時があり、集中が
途切れがちだった。雲の間だが、シーイングそのものはよかった。２枚目に
観測した時は雲がなく、落ち着いて観測することができた。久しぶりにＡＷＯ
を見たが、コントラストが低く、見えにくい状況だった。
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≪滋賀県 大津市 安達 誠≫[Makoto Adachi:Siga Japan]
[ Paul Maxson:Surprise,Arizona,United States]
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