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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/E7BF6MBOQRC2TWIY5DDQKG4JST5PPEDP/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "E7BF6MBOQRC2TWIY5DDQKG4JST5PPEDP",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/E7BF6MBOQRC2TWIY5DDQKG4JST5PPEDP/",
    "sender": {
        "address": "K3IO (a) verizon.net",
        "mailman_id": "79a9b3ddaa4b44baae47f92374974ac4",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/79a9b3ddaa4b44baae47f92374974ac4/emails/"
    },
    "sender_name": "Tom Clark, K3IO",
    "subject": "[amsat-bb] Re: Dont loose the north",
    "date": "2007-12-31T20:12:02Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Jim, ZL1TYF is correct in his interpretation. My QTH is about 35 km from\nBWI (Baltimore-Washington Int'l) airport and is also on the\nBoston/NYC/Philly/Washington/Atlanta/Miami east-coast corridor, so a lot\nof high altitude planes pass overhead, These show up as a thin line\n(cabin lights) and dots (wingtip beacons).\n\nThe bright curving traces are from planes landing or taking off from\nBWI. The Aurora animated GIF, you will see one BWI plane whose track\nsplit between two of the individual frames.\n\nIn these pictures, the shutter was held open for 88 seconds, and then 2\nseconds of dead-time allowed for the JPEG frame to be written to the CF\ncard memory, so a new frame began every 90 seconds.\n\nThe two long exposure star trail photos were made by stacking a number\nof these photos (140 for the non-aurora picture), each one on top of the\nprevious frame. The stacking algorithm involved a pixel-by-pixel search.\nIf the new pixel was brighter than the old one, then the new pixel was\nsaved. If not, the the older, fainter pixel was kept. This is to be\ncontrasted with the normal \"open the shutter for an hour or two\" scheme\nbecause the black background (due to stray skylight and sensor noise)\ndoesn't \"blow up\". To do this processing, I used Max Lyon's Image\nStacker software (http://www.tawbaware.com/imgstack.htm).\n\nIf you view the 4-hour \"140\" picture at maximum resolution\n(http://www.pbase.com/tomcat/image/5186538/original.jpg), you will see\nthat the star trail lines are dashed, due to the 88/2 second timing. The\nearth did rotate under the stares during the 2 second gap! If you look\nat this picture you will notice a gap about 2/3 of the way along each\narc. This is due to the Canon D60 I was using at the time running out of\nbattery power. It took me a few minutes to realize that the pictures had\nstopped. The reason the 4-hour picture was restricted to 140 JPEG frames\nis because, at the time, the biggest CF card I had was 256 MBytes in\nsize. Although the camera produced 6 MPixel images, the individual\nframes were only ~1.5 MBytes because the JPEG compression (quite similar\nto ZIP & RAR) squeezed a lot of black pixels down to only a few bytes!\n(I really need to try a long overnight picture with my new 40D (thanks,\nSanta) camera equipped with a huge 8 GByte CF card.)\n\n\n",
    "attachments": []
}