Re: ISS flyby of Jupiter in broad daylight

From: Anthony Ayiomamitis (
Date: Sun May 30 2010 - 12:12:39 UTC

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    O/H έγραψε:
    > Message: 6
    > Date: Sat, 29 May 2010 21:34:30 -0400
    > From: Greg Williams <>
    > Subject: Re: ISS flyby of Jupiter in broad daylight
    > To: SeeSat <>
    > Message-ID: <>
    > Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
    > I sent it to Fark and they greenlit the link, so if you wonder where  
    > the 2500+ hits came from, here you go:
    Greg, many thanks for promoting the result. I am grateful!
    > Phil "Bad Astronomer" Plait took notice as well. Wouldn't surprise me  
    > if he posts it as well.
    He mentioned to me about putting up something today.
    > I can't even begin to imagine the complexity of getting just this one  
    > perfect shot. Considering Jupiter's position in the sky and a the  
    > ISS's dynamic change in position, I'm sure this wasn't an easy thing  
    > to accomplish by any stretch.
    In fact I nailed it on two consecutive images. My EOS 5D has a burst 
    rate of 3 frames per second and I managed to capture the ISS just before 
    and just after it literally run over Jupiter. I layered the two images 
    together to produce the mini timeseries.
    If you have a look at the second of the two images at you will see that 
    indeed we have very strong evidence that the ISS actually occulted Jupiter.
    > One thing I have to ask is how the double image of the ISS was  
    > attained. 
    Please see my note above and the two images spaced 0.33 seconds apart 
    and which both included Jupiter with the passing ISS.
    > Was it just leaving the shutter open for a second and the  
    > ISS took up two positions on the exposure?
    Not at all since the image would be burned (all white). Please note that 
    I used an exposure of 1/2000" to "freeze" the ISS as it travelled 
    through my field of view and an ISO of 1600 to maximize the dynamic 
    range given the fact the sky was effectively VERY low contrast and at 
    the same time I was using a very fast exposure.
    The exposure itself (1/2000") was precomputed on the basis of the 
    angular velocity of the ISS and the image scale of my optical train.
    > Now, about Pluto...........
    Actually I may have Mercury soon ........ ;-)
    > Greg Williams
    > On May 29, 2010, at 4:48 PM, Walter Nissen wrote:
    >> Hi , all ,
    >> Anthony Ayiomamitis ,
    >> Your image with Jupiter is spectacular .  Congratulations .
    >> This evening a path where the X-37B will occult Saturn an hour
    >> and a half after Sunset at an altitude of 47 degrees will pass
    >> not far from me .
    >> I estimate that at least 90 % of such opportunities are lost
    >> because the proper technology has not yet been deployed .
    >> What is needed is a narrowcasting service using e-mail or
    >> texting to notify potential observers .
    >> The notifications need to be carefully crafted .
    >> Many observers will need more than one notification .
    >> By e-mail , the subject line can be exploited to make the
    >> message clearer , by , e.g. , giving objects , the time and
    >> the distance :  X-37B Saturn 5h 11km .
    >> A link should be provided to the path plotted on google
    >> Earth , or similar .
    >> Also to the best available weather forecast .
    >> Maybe also to a reminder service for temporal customization .
    >> Thomas Fly made some steps in this direction ,
    >> Cheers ,
    >> Walter
    >> _______________________________________________
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