Re: Calipso questions

From: Bjoern Gimle@GlocalNet (Gimle@GlocalNet)
Date: Sat Feb 28 2009 - 09:29:42 UTC

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    The first file in the 1-minute and 10-second tabs, while dated in the past,
    cover 21 vs. 10 days into the future from that date.
    Maybe because the current problem, the 10-s files are outdated.
    I can give you formulae for great circle interpolation between 1-minute
    but that would be overkill if the 10-s file is published when the laser is
    Then you can do linear interpolation, unless you live in near-arctic areas.
    Heavens-Above can give you ground tracks, but not accurate enough for
    (and I don't see the point of using ground tracks instead of star tracks for
    aother satellites).
    You can use Google Earth and load a .kml file built from the CPSO file to
    show a ground track.
    A stripped-down sample built from the file above:
    <?xml version="1.0" encoding="UTF-8"?>
    <kml xmlns="">
    <Document>  <name>2008-11-18 Calipso.kml</name>
    14 Mar 2009 09:32:00.000           37.0876          -109.4213      708.5265
    14 Mar 2009 09:33:00.000           33.4919          -110.4553      707.8640
    14 Mar 2009 09:34:00.000           29.8895          -111.4272      707.2730
    14 Mar 2009 09:35:00.000           26.2814          -112.3489      706.7686
    ----- Original Message ----- 
    From: "Paul Bridges" <>
    To: <>
    Sent: Friday, February 27, 2009 6:30 PM
    Subject: Calipso questions
    > Amateur/Lurker here in California. I have some Calipso passes over the
    > next few months and would like to try to observe/photograph the green
    > laser. I see that the laser is down for most of Mar/Apr due to a leak, but
    > I have good passes in May. I would be appreciative if someone could clear
    > up some of these questions...
    > 1. I normally usually use Heavens-Above and HeavenSat to spot ISS, STS,
    > and Iridiums.  Is there a better tool (using Windows) for making ground
    > tracks?  H-Above provides little detail. SeeSat archives mention
    >, but this appears
    > to be only historical data, and I don't know how to make a ground track
    > from it.
    > 2. I see mentions of "orbit raise" and "drag make-up maneuver". What is
    > the difference?  Is it safe to assume they only affect timing by a few
    > seconds and not the ground track?
    > 3. Since the beam width on ground is only 70 meters, how do I fine tune or
    > verify position?  How would I generate coordinates for use with GPS?
    > Thanks in advance
    > Paul B.
    > -------------------------------------------------------------------------
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