Re: STS-134: videos of Endeavour and ISS, plus solar transits

From: Thierry Legault (legault@club-internet.fr)
Date: Sun Jun 05 2011 - 21:44:18 UTC

  • Next message: j.allport@utoronto.ca: "Re: STS-134: videos of Endeavour and ISS, plus solar transits"

    Justin, although I did not want to overload the 
    e-mail and the web page (most visitors don't care 
    about detailed info such as observation site 
    coordinates), I can provide anything, there is no 
    secret. You just have to ask what you need  :-)
    
    For the first video with Endeavour docked to ISS 
    (area of Pau, France), here are the data:
    - observation site: lat 4321'27"N, long 026'03"W, alt 183m
    - ISS pass culmination at 3:54:35 UTC, altitude 77.4, distance 354.0 km
    - telescope: 10" Meade ACF, focal length 5500mm 
    (2.2x Barlow lens in front of the camera), yellow filter Wratten 12
    - camera Skynyx L2-2 monochrome, resolution 
    1616x1212, recording 12-bit fits files, exposure 
    2ms, gain and gamma unchanged (1)
    - processed video contains 800 frames, beginning 
    at 3:53:24 UTC and ending at 3:54:50 UTC
    - processing: each frame of the final video is a 
    combination of 15 consecutive raw frames (no 
    culling: all raw frames used), followed by 
    wavelet processing in Prism (wavelet type=cube, 
    coefficients: plane 1=4, other planes=1)
    
    I don't have a ftp account, but if you have one 
    please give me the corresponding info so that 
    I'll be able to upload the 3.2 gigabyte of raw 
    files (800 frames, 4 Mbyte each).
    
    I'm going to a business trip all the week (I'm 
    just an amateur astronomer, with a job for living 
    :-)), but next week-end I'll be compiling all the 
    data for the other videos and solar transits.
    
    regards
    
    At 17:48 05/06/2011, j.allport@utoronto.ca wrote:
    
    > > ------------------------------------
    > > From: Thierry Legault <legault@club-internet.fr>
    > > Date: Sun, Jun 5, 2011 at 4:40 AM
    > > Subject: STS-134: videos of Endeavour and ISS, plus solar transits
    > > To: SeeSat-L@satobs.org
    > >
    > >
    > > hello,
    > >
    > > as usual I have travelled in western Europe to catch Endeavour during
    > > STS-134, fighting with bad weather and average seeing. Here is the
    > > compilation of the results:
    > >
    > > http://legault.perso.sfr.fr/STS-134.html
    > >
    > > You'll find a 3D video of a pass of Endeavour docked to the ISS
    > > (stereo pair and anaglyph), another video with two passes of
    > > Endeavour before return to Earth (unfortunately the seeing was bad)
    > > and several solar transits.
    > >
    > > The videos have been taken with a 10" ACF Meade telescope on a
    > > Takahashi EM-400 German mount heavily (hardware and software)
    > > modified for real-time fast tracking with a guide camera on a finder.
    > > The main camera is a Lumenera Skynyx L2-2 recording monochrome 12-bit
    > > Fits files at 10 fps (one frame is 4 Mb and there are more than 1000
    > > frames for a pass). As usual in planetary imaging, each frame of the
    > > final video is a combination of 15 to 30 consecutive registered raw
    > > frames (in order to smooth turbulence and to improve signal-to-noise
    > > ratio), followed by slight sharpening.
    > >
    > > During this vacancy period I have also taken other satellites, it
    > > will take some time for processing and preparation of pages but soon
    > > you'll see videos of passes of USA-186 (Keyhole), X-37B (OTV-2) and
    > > Nanosail. Stay tuned...  :-)
    > >
    > > regards
    > >
    > >
    > >
    > > Thierry Legault
    > > www.astrophoto.fr
    > >
    >
    >First, let me say that I find the data liked above absolutely
    >outstanding. We are all better off for being able to share in Thierry
    >and Emmanuel's results.
    >
    >Unfortunately, I can't be certain, but I think this report does not
    >conform to the SeeSat list rules concerning high-resolution imaging.
    >
    >1. It's not clear to me the intent of rule 1. Is the observer required
    >to provide all available existing desginations from the 3 listed, or
    >only one of the listed? I believe only the common name is provided.
    >It's possible this is sufficient.
    >
    >3. I was not able to find the observing location in the email above,
    >or on the linked site. I propose that "Pau, France", or "Spain" is not
    >of sufficient precision for me to evaluate the supplied data.
    >
    >4. Date and time have been provided to the nearest minute. A factor of
    >60 too coarse to enable reasonable analysis of the data per SeeSat
    >rules. Other observations on the same page have been provided to the
    >nearest day. A factor of > 80000 too coarse. Further, even if the time
    >to the nearest second were provided for the video, there are many
    >still-frames shown from the video. It is not clear to me at what point
    >in the video these were taken, compounded by the fact that the video
    >itself has been accelerated. By my estimation, none of the presented
    >data is in accord with this rule.
    >
    >9. The data provided are deficient in several aspects: Total duration
    >is provided for the solar transit images, but not for the pass videos.
    >Exposure per frame is not provided for the video (though thankfully it
    >is provided for the DSLR-taken transit images. Resolution and bit
    >depth for the raw data are not provided.
    >
    >10. Processing is described in a cursory manner on the linked
    >equipment page (stacking in groups of 10, wavelet sharpened, and low
    >level adjustment). It's not clear exactly what settings are used for
    >such processing, nor is it clear whether there has been any culling
    >from the raw data prior to stacking.
    >
    >11. Raw data is not provided, nor is it offered as available on request.
    >
    >As such it is clear this post does not adequately address the list
    >rules. I leave it as an exercise for the reader to decide if it's the
    >posted data or the rules themselves that are inappropriate for the list.
    >
    >Regards,
    >Justin
    >
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    Thierry Legault
    www.astrophoto.fr
    
    
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