RE: ST OBS May 9, 2013: w/ UNID

From: Ted Molczan (ssl3molcz@rogers.com)
Date: Fri May 10 2013 - 21:09:03 UTC

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    Mike McCants has pointed out that Cees Bassa's UNID 99059, observed on 2012 May 03 UTC, correlates with Scott Tilley's
    UNID 99143/99144.
    
    Adding it to the data set yields a near-zero decay term - surprising for so low an orbit:
    
    13618A                                                   423 X 425 km
    1 99143U 13618A   13129.36367123 -.00000178  00000-0 -35992-5 0    06
    2 99143  97.1489 250.1926 0001057 319.3248  40.7923 15.46466929    01
    Arc 20130428.37-0509.37 WRMS resid 0.016 totl 0.015 xtrk
    
    Here is Mike's very similar result for the same span:
    
    Unknown 130428
    1 99143U 13618A   13129.37386472 0.00000000  00000-0  00000-0 0    04
    2 99143  97.1534 250.2405 0005719 244.0786 172.8044 15.46470036    00
    
    Interesting that Scott described this object as very bright. Either it has an extremely low area to mass ratio, or it
    manoeuvres to counteract drag. I am having trouble remembering any known launch that could account for this. I must be
    forgetting some obvious payload. If not, then I wonder whether USA 116 (95066A / 23728) could have remained in orbit
    after all. The RAAN is in a reasonable location. There was good reason to suspect that it was deorbited in 2008 Nov, but
    I am not aware of any proof. Oh well, one of us will figure it out.
    
    Ted Molczan
    
    
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