USA 186 28888 possibly recovered

From: Leo Barhorst via Seesat-l <seesat-l_at_satobs.org>
Date: Sun, 19 Feb 2017 16:25:00 +0100
Last evening I imaged a UNID.
Using Mike's 73 day old elements fir 28888 I had the camera on the
predicted spot
from about 11 min before to 4 min after the predicted time.
But nothing was seen that looked like 28888.
Then the camera moved to a spot nearby and in the 3rd frame the UNID
appeared.
So I was quite lucky to capture it.
99999 17 549A   4172 G 20170218191806258 17 25 2208981+655241 37 S
99999 17 549A   4172 G 20170218191810954 17 25 2149012+650757 37 S
99999 17 549A   4172 G 20170218191813813 17 25 2138184+643724 37 S

Using Satfit to ID it gave 1 strong and a few other candidates.
The strong candidate was 28888 USA 186.


32750  -19.173    2.838    0.176 17549A   87.076
29658  -33.983    1.468    0.178 17549A  138.028
28888  -26.154   -0.691    0.073 17549A   73.044
23605 -215.436   -0.123    0.375 17549A    4.011


The residuals wrt classfd.tle Feb 14 give:
28888 17 549A   | -10.86607 deg -869.724 sec  73.0 day, 3406.5 km
32750 17 549A   | -4.10984 deg -642.695 sec  87.1 day, 2825.3 km
29658 17 549A   | -6.25274 deg -1062.159 sec 138.0 day, 4456.5 km
23605 17 549A   | -156.28080 deg -880.238 sec   4.0 day, 12485.6 km

I asked Mike to have a look at it.
He confirmed it could be 28888.

>>
This object seems to match the inclnation and node
expected for USA 186 quite well.

Here is a circular orbit:

1 99991U          17049.79405826 0.00000000  00000-0  00000-0 0    02
2 99991  96.8084  90.0920 0004459  19.0198 340.9802 15.44346673    03

But it's likely that the correct orbit is not circular.

Here is my guess:

USA 186
1 28888U 05042A   17049.79387321 0.00010000  00000-0  11624-3 0    07
2 28888  96.9403  90.3384 0121167 158.0603 201.9397 15.53079055    06
>>

Hopefully the weather will clear in the next few days to verify Mike's TLE.

Regards
Leo
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Received on Sun Feb 19 2017 - 09:25:38 UTC

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