Decaying NEAR and Iridium rockets

Alan Pickup (alan@wingar.demon.co.uk)
Tue, 13 Jan 1998 21:28:35 +0000

As the NEAR spacecraft prepares to swing by the Earth, the Delta 2
rocket which launched it almost two years ago is nearing re-entry. Also
into its last few days is the Chinese CZ-2C (Long March) rocket which
launched Iridiums 42 & 44 on December 8.

The latest elsets from OIG for these are:
NEAR r           5.4  2.9  0.0  5.5 d            546 x 144 km
1 23785U 96008B   98013.53387010  .03778778 -10077-4  50295-3 0  5083
2 23785  25.8954 144.3170 0298958 353.4179   6.2508 15.74803572 77752
Iridm CZ-2C r   10.0  3.0  0.0  3.0 d            353 x 161 km
1 25079U 97077C   98013.40961611  .01310492 -13530-5  39315-3 0   962
2 25079  86.2797 102.5826 0144401  26.7176 334.1464 16.06321167  5666

NASA's current 60-day decay forecast (issued on January 9) has these
decaying on January 14 and 12 respectively. My current SatEvo
calculations suggest that more realistic dates are January 18 and 20.

Predicted elsets for the next couple of days:
NEAR r           5.4  2.9  0.0  5.5 d            525 x 144 km
1 23785U 96008B   98014.04020224  .03879540  16310-2  50503-3 0 95084
2 23785  25.8947 140.5243 0283316 359.8398   0.1514 15.78568450 77834
NEAR r           5.4  2.9  0.0  5.5 d            502 x 144 km
1 23785U 96008B   98014.54527549  .04141911  18705-2  52055-3 0 95080
2 23785  25.8940 136.7196 0266753   6.2819 354.0460 15.82617344 77910
NEAR r           5.4  2.9  0.0  5.5 d            478 x 144 km
1 23785U 96008B   98015.04900378  .04455771  23119-2  53628-3 0 95085
2 23785  25.8933 132.9022 0249141  12.7455 347.8728 15.86942620 77995
NEAR r           5.4  2.9  0.0  5.5 d            452 x 144 km
1 23785U 96008B   98015.55129572  .04849652  29558-2  55299-3 0 95084
2 23785  25.8925 129.0711 0230240  19.2324 341.6225 15.91608520 78073
NEAR r           5.4  2.9  0.0  5.5 d            423 x 144 km
1 23785U 96008B   98016.05203664  .05363921  39600-2  57075-3 0 95089
2 23785  25.8916 125.2252 0209709  25.7445 335.2846 15.96710299 78152

Iridm CZ-2C r   10.0  3.0  0.0  3.0 d            344 x 161 km
1 25079U 97077C   98014.03223932  .01421617  42369-3  40797-3 0 90965
2 25079  86.2791 102.2316 0138049  24.0704 336.5690 16.08057755  5769
Iridm CZ-2C r   10.0  3.0  0.0  3.0 d            336 x 160 km
1 25079U 97077C   98014.52986484  .01488942  48106-3  41109-3 0 90964
2 25079  86.2785 101.9505 0132755  21.9498 338.6136 16.09505418  5844
Iridm CZ-2C r   10.0  3.0  0.0  3.0 d            328 x 160 km
1 25079U 97077C   98015.02703324  .01565673  55068-3  41429-3 0 90967
2 25079  86.2780 101.6689 0127245  19.8267 340.6634 16.11023205  5924
Iridm CZ-2C r   10.0  3.0  0.0  3.0 d            320 x 159 km
1 25079U 97077C   98015.52372232  .01654157  64037-3  41759-3 0 90960
2 25079  86.2774 101.3869 0121492  17.7010 342.7189 16.12621361  6001
Iridm CZ-2C r   10.0  3.0  0.0  3.0 d            311 x 159 km
1 25079U 97077C   98016.01990645  .01757635  75654-3  40849-3 0 90960
2 25079  86.2768 101.1046 0115459  15.5724 344.7799 16.14312824  6083

Alan
-- 
 Alan Pickup | COSPAR site 2707:   55d53m48.7s N   3d11m51.2s W    156m asl
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