Decay watch update: December 20

Alan Pickup (alan@wingar.demon.co.uk)
Sun, 20 Dec 1998 22:24:44 +0000

As Harro Zimmer has noted, we are still awaiting the final decay notices
for #25499, the aux motor. It is possible that the problems that caused
OIG to be off-line for several hours on Saturday may also have caused
them to miss several decay notices from USSPACECOM - perhaps these will
appear once OIG staff return after the weekend.

One further decay notice has appeared:

Object                            Notice issued    Predicted decay
                                       UTC              UTC
#25120 = Orbcomm 9 Pegasus r      Dec 20 00:27     Dec 29 00:24 +-5d

My current prediction for this shows decay on December 28 +-2 days, with
a possibility that forecast increased geomagnetic activity over the next
few days may bring it down earlier rather than later.

The latest elset is:
Orbc9 Pegasus r  1.3  1.0  0.0  7.0 d            309 x 218 km
1 25120U 97084J   98354.84300705  .00976093  97473-5  10668-2 0  4003
2 25120  44.9506 306.8069 0067957 127.4887 233.2245 16.04014244 55976

            ----------------------------------------------

There are a number of decayers from yesterday's launch of two more
Iridium satellites by a Long March rocket. None of the objects from this
launch have been identified yet in OIG's database. The following elsets,
with my own provisional IDs, are taken from my current select.tle:

Iridium 98074A   3.0  0.0  0.0  6.0 d            655 x 623 km
1 25577U 98074A   98354.81489660 -.00110371  00000-0 -15931-1 0    58
2 25577  86.3566 197.7621 0022702 299.8886  59.9741 14.76841805   197
Iridium 98074B   3.0  0.0  0.0  6.0 d            654 x 623 km
1 25578U 98074B   98354.74702460 -.00062465  00000-0 -89195-2 0    51
2 25578  86.3552 197.7918 0021900 300.0417  59.8618 14.77027466   187
Iridium CZ-2C r ?                                655 x 177 km
1 25579U 98074C   98354.56124300  .00758841 -13511-5  67800-3 0    92
2 25579  86.3651 197.8141 0351567 168.1086 192.8767 15.50165206   165
Iridium Smart Dispenser ?                        623 x 212 km
1 25580U 98074D   98354.56102105  .00222815 -13417-5  51137-3 0    57
2 25580  86.3355 197.8250 0302278 154.8655 206.7657 15.49788859   164
Iridium deb E                                    818 x 176 km
1 25581U 98074E   98353.79190122 -.52253031  33300-5 -51024-1 0    34
2 25581  86.0756 198.3134 0467376 167.6204 194.0904 15.22991859    45
Iridium deb F                                    770 x 175 km
1 25582U 98074F   98354.44841751  .08698174 -19916-5  81118-2 0    79
2 25582  86.7227 197.8610 0434183 169.3389 191.7464 15.31018007   143
Iridium deb G                                    809 x 177 km
1 25583U 98074G   98354.12102110  .06469662 -17713-5  66029-2 0    55
2 25583  86.6535 197.9425 0459990 172.6675 188.6476 15.24237875    98
Iridium deb H                                    804 x 178 km
1 25584U 98074H   98354.45113651  .06359840 -18284-5  66450-2 0    41
2 25584  86.1205 197.9198 0455650 162.5481 199.4338 15.24986917   159

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
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