Finding USA 116

From: Bjoern Gimle (b_gimle@algonet.se)
Date: Mon Dec 18 2000 - 10:22:26 PST

  • Next message: Paul Gabriel: "obs 18 dec 00353.02"

    USA 116 is usually manoeuvred on its perigee pass about three hours =
    after the USA 129 manoeuvre.
    Its mean motion is adjusted to about 0.005 to 0.01 higher than USA =
    129's, but the difference will be reduced to its negative counterpart in =
    a few months time, because of USA 116's lower drag.
    
    Around Nov.29.878 USA 129 went into its higher orbit:
    USA 129 334.879 after manoeuvre ?
    1 24680E 96072A     334.87900000  .00036489  00000-0  52143-3 0    10
    2 24680  97.8663  35.0543 0513323 159.0563   0.2544 14.74593739 -1275
    
    USA 116 search orbit:
    USA 116 +13 m/s Manoeuvre?
    1 70061E 95066A   00334.96860000  .00020235  00000-0  45899-3 0    22
    2 70061  97.9527  83.7704 0458414  11.7970 359.8537 14.75449079  1082
    
    However, on Nov.29 the time (and ground track longitude) separation from =
    USA 116 was larger (02:48) than usual, so it is possible USA 116 was =
    allowed to stay a day or two more in the low orbit, to let USA 129 =
    reduce this difference:
    USA 116 335.99 +13 m/s Manoeuvre?
    1 70062E 95066A   00334.96240000  .00020235  00000-0  45899-3 0    22
    2 70062  97.9527  83.7704 0458414  11.7970 359.8537 14.75449079  1082
    
    Also, three weeks have passed, adding to the normal uncertainty, so here =
    is a later pass:
    USA 116 +13.5 manoeuvre?
    1 70063E 95066A   00334.96860000  .00020235  00000-0  45899-3 0    22
    2 70063  97.9527  83.7704 0459740  11.7966 359.8541 14.75141254  1089
    
    However, I believe more in the early orbit, 70062 ( or a 14.757 MM =
    variant of 70061)
    
    From Dec.22 USA 116 may reach 11 degrees above the S horizon for Tony =
    Beresford, a week later for Greg Roberts. I wish them the best of luck !
    
    Is any observer living further south?
    
    (Recent USA 129 elset from Ted Molczan:
    USA 129         15.0  3.0  0.0  5.1 v
    1 24680U 96072A   00343.53368056  .00036489  00000-0  52143-3 0    01
    2 24680  97.8663  43.5071 0510901 130.5425 234.1458 14.75220221    00
    )
    
    
    -- bjorn.gimle@tietotech.se (office)                         --
    -- b_gimle@algonet.se (home)  http://www.algonet.se/~b_gimle --
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    -- COSPAR 5918, HAMMARBY, 59.2985 N, 18.1045 E, 44 m         --
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