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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/MTAJTZTH6QY2PZOPO3EV7FSAQ6I27QY5/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "MTAJTZTH6QY2PZOPO3EV7FSAQ6I27QY5",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/Y27FSKYG7QAT7A5H67BUCSSBNGDF6LHM/?format=api",
    "sender": {
        "address": "juicewvu (a) gmail.com",
        "mailman_id": "2e9c506b76b74a38aa4f26e5f63bf9b1",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/2e9c506b76b74a38aa4f26e5f63bf9b1/emails/?format=api"
    },
    "sender_name": "Josh Smith",
    "subject": "[amsat-bb] Re: Satellite Orbit Prediction in Python",
    "date": "2009-09-28T22:12:18Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/HMLGJGT34W6KGUTGJC23O3AI6NVSEAEX/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
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        "status": "neutral"
    },
    "content": "Bryan,\nThanks for the link especially to the source as I am very interested\nin implementing something very similar.  (for my QTH of course)\n\nThanks\nJosh Smith\nKD8HRX\nemail/jabber:  [email protected]\nphone:  304.237.9369(c)\n\n\n\n\n\nOn Mon, Sep 28, 2009 at 2:41 PM, Bryan Klofas <[email protected]> wrote:\n> Hey Mark--\n>\n> We also use pyephem for web-based pass times calculations at Cal Poly.\n> http://mstl.atl.calpoly.edu/~ops/passtimes/\n>\n> Source is here, but it was written a few years back, and uses the older\n> (now depreciated) ephem.Body attributes. It also sometimes has trouble\n> with the formatting on the webpage, although that may be a firefox bug,\n> I'm not sure.\n> http://mstl.atl.calpoly.edu/~ops/passtimes/passtimes.py\n> --\n> Bryan Klofas, KF6ZEO\n>\n>\n> Mark VandeWettering wrote:\n>> I just thought I'd drop a quick note here about some fun I've been\n>> having today with satellite orbit prediction in Python.   When I\n>> started mucking around with satellites, I used \"predict\", which was\n>> pretty good, but at some point I wanted to answer some questions which\n>> weren't easy to answer using predict.   Questions like \"when will\n>> AO-51 be visible from both my home in CM87 and locations in Hawaii\",\n>> or \"what was the radius of the circle of visibility for AO-7 compared\n>> to ISS\"?\n>>\n>> Luckily, I'm a programmer.   In fact, I'm a programmer who programs\n>> for fun.   So, I did a bit of research, and then coded up a version of\n>> G3RUH's \"Plan 13\" algorithm in Python, and then wrote some scripts to\n>> download elements from celestrak, and then a simple one to print data\n>> on the next pass of any named satellite.     And, they worked pretty\n>> good.  I've used them for the last year or so to do all my pass\n>> predictions.   But there are still a couple of minor issues with the\n>> library.  It didn't handle geosynchronous satellites very well.   It\n>> implemented only the most basic of orbital models.   I was never\n>> confident that the \"is this satellite in eclipse\" stuff working\n>> exactly right.\n>>\n>> Luckily though, it turns out that someone else has been busy writing a\n>> more complete library: PyEphem http://rhodesmill.org/pyephem/\n>>\n>> It's a library whose primary purpose is to calculate the positions of\n>> astronomical objects.    I've used it a couple of times to (for\n>> instance) figure out the size of Mars compared to Jupiter, and found\n>> it very easy to use.   But today, I realized that it had a full\n>> implementation of the SGP4 and SDP4 orbital models built in, and could\n>> be used to predict satellite passes.    As a proof of concept, I\n>> hacked together a 23 line script that could print the details of\n>> upcoming ISS passes.   It seems to work great, and is really quite\n>> easy to use.\n>>\n>> You can find some of the simple example code at my blog:\n>>\n>> http://brainwagon.org/2009/09/27/how-to-use-python-to-predict-satellite-locations/\n>>\n>> I'll probably be porting all of my existing scripts to use this soon.\n>>  In the mean time, if you have a similar task, you might look to it to\n>> solve your custom satellite prediction problems.\n>>\n>> 73 Mark K6HX\n>> _______________________________________________\n>> Sent via [email protected]. Opinions expressed are those of the author.\n>> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>\n\n",
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}