RE: Would Like People To Try To Track Decaying Uncataloged Object

From: Ted Molczan via Seesat-l <seesat-l_at_satobs.org>
Date: Wed, 3 May 2017 15:01:35 -0400
Charles Phillips wrote:

> Here is a request that perhaps might be fun. Object 90059 is possibly a Centaur and is
> decaying from a geosynchronous transfer orbit. Inclination is 28.66 degrees - came from Cape
> Canaveral no doubt. Perigee is approximately 310 km so it is not long for this world ...

The perigee of that object has been within several tens of kilometres of about 300 km for as long we have known about
it. 

Below is one of Mike McCants' earliest TLEs:

                                                       247 X 35827 km
1 90059U 06675A   06213.40370816  .00000542  00000-0  14233-3 0    08
2 90059  28.7365 286.3203 7286371 158.7000 201.2761  2.27620548    00

Mike's latest TLE reveals that about 1,000 km had been whittled from the apogee after nearly a decade:

                                                       311 X 34852 km
1 90059U 06675A   17020.64640616  .00000300  00000-0  23162-3 0    03
2 90059  28.6612 328.0243 7208154 266.7307  16.3456  2.34139509    01

Propagating the above elements 10 years into the future using GMAT 2015a, reveals a few thousand more kilometres shaved
off the apogee:

                                                       318 X 32203 km
1 70000U          27018.64640046  .00000013  00000-0  10000-4 0    07
2 70000  28.6510 326.9924 7042002  84.0925 213.0389  2.54936112    08

I used ISON's value of A/m, 0.00666 m^2/kg, and took into account the relevant gravitational perturbations. The GMAT
script is available here:

http://satobs.org/seesat_ref/misc/06675A.script

Ted Molczan


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Received on Wed May 03 2017 - 14:02:19 UTC

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