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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7FHMVD7Q4ATQWANACNEN4XYEOUBHMQEI/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "CAEahN0LbS8PkmazdF5=0T-vtyf5f86BLdLTE=NsY8nTxHxv+jg@mail.gmail.com", "message_id_hash": "7FHMVD7Q4ATQWANACNEN4XYEOUBHMQEI", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/7FHMVD7Q4ATQWANACNEN4XYEOUBHMQEI/", "sender": { "address": "ai7rogerroger (a) gmail.com", "mailman_id": null, "emails": null }, "sender_name": "Roger", "subject": "Re: [amsat-bb] Tiangong Re-entry (0000 UTC +/- 2.5 hrs)", "date": "2018-04-02T00:17:04Z", "parent": null, "children": [], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "You have to manually refresh, F5.\n\n\n73, Roger\nW7TZ\nCN83ia\nGrid Busters\nw7tz.webs.com\n\nOn Sun, Apr 1, 2018 at 5:15 PM, Greg D <[email protected]> wrote:\n\n> Ah, interesting site. Wouldn't it be fitting if it returned to the launch\n> site. Looks like it might pass just under...\n>\n> For a change, Australia isn't a target this time :).\n>\n> Greg KO6TH\n>\n>\n>\n> Roger wrote:\n>\n> http://www.aerospace.org/CORDSuploads/TiangongStoryboard.png\n>\n> Shows it on what's expected to be it's last orbit.\n>\n>\n> 73, Roger\n> W7TZ\n> CN83ia\n> Grid Busters\n> w7tz.webs.com\n>\n> On Sun, Apr 1, 2018 at 5:03 PM, Greg D <[email protected]> wrote:\n>\n>> I just updated the keps on gPredict, and Tiangong-1 disappeared from the\n>> list. Where'd it come down, or are rumors of its demise ever so\n>> slightly exaggerated? Heavens-above still thinks it's up there.\n>>\n>> Greg KO6TH\n>>\n>>\n>> Robert Bruninga wrote:\n>> > Since this is journalism, I think you and some others are right. If one\n>> > simply looks at latitude as a number, then the latitude near the\n>> > inclination will have a higher probability of appearing. But the best\n>> > feedback came from Ralph W0RPK who pointed out this page which is\n>> tracking\n>> > the orbit with updated predictions:\n>> > http://www.aerospace.org/CORDSuploads/TiangongStoryboard.png\n>> >\n>> > And the USA is about as far as you can get from the predicted impact.\n>> The\n>> > USA is 12 hours out of cycle with the orbit.\n>> >\n>> > The prediction there is currently showing about 0000 UTC which is 8 PM\n>> EDT\n>> > plus or minus 2.5 hours. (which is about 3 orbits worth). And although\n>> > those orbits cover a vast Pacific and Atlantic oceans, a good portion of\n>> > them cross the middle east through Russia and china.\n>> >\n>> > Bob, WB4APR\n>> >\n>> > On Sun, Apr 1, 2018 at 11:26 AM, Gary Bender, WS5N <[email protected]>\n>> > wrote:\n>> >\n>> >> I was thinking the favoring of higher latitudes for reentry was because\n>> >> the apparent sine wave of the ground track naturally slows down in\n>> >> \"latitude velocity\" as it peaks at 43 degrees and reverses. Add in the\n>> >> rotation of the earth under it and you end up with a bit more dwell\n>> time\n>> >> above 38 degrees. It is changing latitude much faster between the\n>> >> extremes. (Or maybe I am over thinking it.)\n>> >> --\n>> >> Gary, WS5N\n>> >>\n>> >> ----- Original Message -----\n>> >> From: \"Robert Bruninga\" <[email protected]>\n>> >> To: \"amsat bb\" <[email protected]>\n>> >> Cc: \"TAPR APRS Mailing List\" <[email protected]>\n>> >> Sent: Saturday, March 31, 2018 5:55:17 PM\n>> >> Subject: Re: [aprssig] [amsat-bb] Tiangong Re-entry on Heavens bove\n>> >>\n>> >>> Hi Bob, do you know the object number by chance?\n>> >> No, but this link shows that the higher probabilities or re-entry are\n>> >> between about 38 to 43 degree latitudes north and south.\n>> >>\n>> >> https://www.theguardian.com/science/2018/mar/30/chinas-tiang\n>> ong-1-space-st\n>> >> ation-will-crash-to-earth-this-weekend\n>> >> <https://www.theguardian.com/science/2018/mar/30/chinas-tian\n>> gong-1-space-st%0Aation-will-crash-to-earth-this-weekend>\n>> >>\n>> >> Im not sure why those would be slightly higher. 43 degrees is its\n>> maximum\n>> >> excursion (matches its inclination)... Maybe its because as it passes\n>> >> over the equatorial bulge, it sees the higher drag and that will start\n>> the\n>> >> demise which will occur then 20 minutes later?\n>> >>\n>> >> Bob\n>> >> -----Original Message-----\n>> >> From: Robert Bruninga\n>> >> Sent: Saturday, March 31, 2018 9:16 AM\n>> >> Subject: [amsat-bb] Tiangong Re-enetry on Heavens bove\n>> >>\n>> >> You can see the live track of Taengong to re-enter in the next 24\n>> hours on\n>> >> http://www.heavens-above.com/\n>> >>\n>> >> Just remember, as it suffers increased drag, it will speed up and be\n>> ahead\n>> >> of classic predictions.\n>> >>\n>> >> But at least you can see when you are under the orbit as to whether it\n>> is\n>> >> worth going outside. I 'd go out several minutes before the prediction\n>> >> since we dont know how quickly they are updating the elements as it\n>> speeds\n>> >> up.\n>> >>\n>> >> and even if it is daytime, you will see it if it comes in in your\n>> area...\n>> >>\n>> >> Bob\n>> >> _______________________________________________\n>> >> Sent via [email protected]. AMSAT-NA makes this open forum available\n>> to\n>> >> all interested persons worldwide without requiring membership. Opinions\n>> >> expressed are solely those of the author, and do not reflect the\n>> official\n>> >> views of AMSAT-NA.\n>> >> Not an AMSAT-NA member? Join now to support the amateur satellite\n>> program!\n>> >> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n>> >> _______________________________________________\n>> >> aprssig mailing list\n>> >> [email protected]\n>> >> http://www.tapr.org/mailman/listinfo/aprssig\n>> >>\n>> > _______________________________________________\n>> > Sent via [email protected]. AMSAT-NA makes this open forum available\n>> > to all interested persons worldwide without requiring membership.\n>> Opinions expressed\n>> > are solely those of the author, and do not reflect the official views\n>> of AMSAT-NA.\n>> > Not an AMSAT-NA member? Join now to support the amateur satellite\n>> program!\n>> > Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n>>\n>> _______________________________________________\n>> Sent via [email protected]. AMSAT-NA makes this open forum available\n>> to all interested persons worldwide without requiring membership.\n>> Opinions expressed\n>> are solely those of the author, and do not reflect the official views of\n>> AMSAT-NA.\n>> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n>> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n>>\n>\n>\n>\n", "attachments": [] }
