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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/SH2HT3PL54PZP3PDQDXK2XGD6FEIY5WI/",
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    "message_id": "001401c83f71$52f39a90$6601a8c0@MASTER",
    "message_id_hash": "SH2HT3PL54PZP3PDQDXK2XGD6FEIY5WI",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/EW2IOPR2SCK7745CDY5AHVOXGCHX7NWJ/",
    "sender": {
        "address": "jkelly (a) bellatlantic.net",
        "mailman_id": "4f11d0e7b1a54ee59aab39bb68a7f5c2",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/4f11d0e7b1a54ee59aab39bb68a7f5c2/emails/"
    },
    "sender_name": "jkelly@home",
    "subject": "[amsat-bb] Re: Explain Photo?",
    "date": "2007-12-15T23:22:12Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/TMP56EGLFPHZ5RIPTV7QJJ7TPGCUSEGE/",
    "children": [],
    "votes": {
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        "status": "neutral"
    },
    "content": "Thank you Sil - excellent explanation.\n\nJeff\n\n\n----- Original Message ----- \nFrom: \"Sil - ZL2CIA\" <[email protected]>\nTo: \"jkelly@home\" <[email protected]>; \"AMSAT\" <[email protected]>\nSent: Saturday, December 15, 2007 6:04 PM\nSubject: Re: [amsat-bb] Explain Photo?\n\n\n> jkelly@home wrote:\n>> Can someone explain to me what actually is happening in this photo?\n>>\n>> http://www.eanet.com/kodama/astro/2007/1110a/7.htm\n>>\n>> Jeff\n>> KT2K\n>>\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 \n>> program!\n>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>>\n> Hi Jeff,\n>\n> you probably want to know more than this..\n>\n> What I understand is happening is that the excess fuel  (propellant and \n> oxidizer) is vented from the rocket. This is fuel that was unused by the \n> rocket and remained in the tanks. The rocket motor was shut down before \n> all the fuel was used because the rocket had reached a sufficient velocity \n> to attain the required orbit.\n>\n> I think the fuel is dumped into space because it is considered a safety \n> risk to leave it in the rocket's fuel tanks.\n>\n> When the fuel is dumped, it does not burn. The fuel is visible because it \n> reflects sunlight before it becomes dispersed. I imagine that the fuel is \n> released in liquid form. Surface tension probably forms it into small \n> droplets which quickly evaporate.\n>\n> While it looks as though the fuel is being squirted out of the rocket in a \n> jet of fluid, it is not and this is an illusion. The fuel is vented and \n> the cloud of fuel immediately starts expanding into the vacuum around the \n> craft. In this photo, the rocket is moving from left to right. It is \n> orbiting and not being propelled by it's motor any more. The fuel on the \n> left of the picture has had more time to expand into space, while the fuel \n> on the right has only just been released. This creates a nice illusion of \n> a jet from the rocket but that is not what is happening in this photo.\n>\n> There must be more to the story that this. Even dumping the fuel could \n> alter the orbit of the craft, so it would have to be done in a very \n> managed way. I have read that the Apollo 13 flight suffered an error \n> because the Lunar Module (used as a lifeboat) vented waste gases unevenly.\n>\n> It you are interested, I found a story about another space fuel dump here:\n>\n> www.space.com/spacewatch/mystery_cloud_040901.html\n>\n> And a story about some on watching it here:\n>\n> http://www.satobs.org/seesat/Nov-1997/0141.html\n>\n> And here:\n>\n> http://www.allaboutastro.com/Delta4.html\n>\n> It would be a cool thing to see.\n>\n> Best wishes.\n>\n> Sil\n> ZL2CIA \n\n",
    "attachments": []
}