Decay watch: May 21 (Nimiq 1 Proton & platform)
Alan Pickup (alan@wingar.demon.co.uk)
Fri, 21 May 1999 20:52:21 +0100
SpaceCom has not yet identified the objects from the Nimiq 1 launch
or, for that matter, those from the TERRIERS/MUBLCOM launch some days
ago. I expect the following are correct, though...
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Object: #25741 = 99- 27 B = Nimiq 1 Proton r
Decay predictions:
Source Prediction made Predicted decay at Latitude Longitude
UTC UTC deg deg
SpaceCom May 21 08:04 May 22 23:52 +-1d 43.9 S 73.5 W
SatEvo May 21 19:45 May 22 23:43 +-7h 51.2 S 100.4 W
Latest elset:
Nimiq 1 Proton r 206 x 151 km
1 25741U 99027B 99141.66417230 .03569061 12239-4 25460-3 0 81
2 25741 51.6062 220.8844 0041960 272.8787 86.6719 16.35167735 124
SatEvo prediction:
Nimiq 1 Proton r 195 x 146 km
1 25741U 99027B 99142.03051415 .04743711 12772-1 20802-3 0 90082
2 25741 51.6053 218.8220 0037222 274.4206 85.1541 16.38254577 186
Nimiq 1 Proton r 185 x 142 km
1 25741U 99027B 99142.27432425 .05970140 22314-1 17869-3 0 90083
2 25741 51.6046 217.4439 0033391 275.4509 84.1682 16.40839763 224
Nimiq 1 Proton r 173 x 136 km
1 25741U 99027B 99142.51769765 .08350542 48265-1 15486-3 0 90087
2 25741 51.6036 216.0624 0028580 276.4839 83.1907 16.44248866 260
Nimiq 1 Proton r 154 x 127 km
1 25741U 99027B 99142.76045287 .15268579 18551+0 14051-3 0 90086
2 25741 51.6022 214.6761 0021352 277.5204 82.2369 16.49603256 309
Nimiq 1 Proton r 137 x 117 km
1 25741U 99027B 99142.88145522 .28319967 64469+0 14172-3 0 90087
2 25741 51.6009 213.9801 0015371 278.0410 81.7845 16.54548123 322
Nimiq 1 Proton r 123 x 109 km
1 25741U 99027B 99142.94178678 .48598637 23411+1 14588-3 0 90081
2 25741 51.5998 213.6307 0010779 278.3023 81.5754 16.58908064 332
Note: Near identical predictions by SpaceCom and SatEvo, though
SpaceCom's was made much earlier. This is a morning object after it
leaves eclipse near 48 deg N latitude at 02:30h local time. Eclipse
entry is near 51 deg S latitude in the evening.
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Object: #25742 = 99- 27 C = Nimiq 1 Proton platform
Decay predictions:
Source Prediction made Predicted decay at Latitude Longitude
UTC UTC deg deg
SpaceCom May 21 08:23 May 21 14:52 +-4h 50.3 N 167.0 W
SpaceCom May 21 13:30 May 21 14:58 +-2h 49.9 N 130.5 W
SpaceCom May 21 14:27 May 21 14:15 +-7m 35.6 S 94.6 E
SatEvo May 21 19:00 May 21 14:31 +-35m 13.1 N 135.2 E
Final elset:
Nimiq 1 Proton platform 173 x 151 km
1 25742U 99027C 99141.48058839 .20211329 12287-4 93882-3 0 73
2 25742 51.5873 221.9190 0016918 238.0496 121.7234 16.41396766 90
Note: I put decay over the extreme W Pacific, just after a northbound
equator crossing over Indonesia. The small uncertainty in SpaceCom's
final report suggests that there are fixes on the following orbit, so
a further elset may yet appear. SpaceCom puts decay slightly earlier
than SatEvo, over the SE Indian Ocean.
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Alan
--
Alan Pickup | COSPAR 2707: 55d53m48.7s N 3d11m51.2s W 156m asl
Edinburgh | Home: alan@wingar.demon.co.uk +44 (0)131 477 9144
Scotland | SatEvo page: http://www.wingar.demon.co.uk/satevo/