Decay watch: May 23 (Nimiq 1 Proton down)
Alan Pickup (alan@wingar.demon.co.uk)
Sun, 23 May 1999 10:21:48 +0100
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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
SpaceCom May 22 00:36 May 22 21:33 +-13h 51.7 N 99.2 E
SpaceCom May 22 08:49 May 22 21:04 +-8h 24.4 S 2.3 W
SpaceCom May 22 14:42 May 22 20:33 +-4h 15.2 S 140.9 W
SpaceCom May 22 18:36 May 22 20:28 +-3h 0.7 S 151.6 W
SpaceCom May 23 01:53 May 22 20:28 +-3h 0.7 S 151.6 W
SatEvo May 21 19:45 May 22 23:43 +-7h 51.2 S 100.4 W
SatEvo May 22 11:25 May 22 22:50 +-3h 42.1 N 36.2 E
SatEvo May 23 08:00 May 22 21:42 +-2h 31.3 N 159.7 E
Final elset:
Nimiq 1 Proton r 163 x 128 km
1 25741U 99027B 99142.63913123 .13370630 12652-4 14960-3 0 165
2 25741 51.5996 215.3762 0027066 275.2984 84.4949 16.47599665 286
Note: The final elset (5 or 6 hours before decay) has this 5 seconds
early against yesterday's SatEvo prediction. I show it surviving for
almost a full orbit longer than does SpaceCom, with decay while
southbound over the western Pacific. My predicted elset for the
beginning of the final rev is:
Nimiq 1 Proton r 117 x 104 km
1 25741U 99027B 99142.88104132 .84609323 11257+2 19967-3 0 90164
2 25741 51.5960 213.9833 0009394 276.3403 83.5527 16.61026459 321
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Alan
--
Alan Pickup | COSPAR 2707: 55d53m48.7s N 3d11m51.2s W 156m asl
Edinburgh | Tel: +44 (0)131 477 9144 Fax: +44 (0)870 0520750
Scotland | SatEvo page: http://www.wingar.demon.co.uk/satevo/