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I can only guess 509356 is not S509356.

JPL's Horizons doesn't appear to recognise any of the identifiers in the linked TLE for that designator

\# Worst residual: 6.23 km
\# MJD 57389.000000 (2016 Jan  2  0:00)
2015-019C = NORAD 41929 = S509356 = WJ2AD07
1 41929U 15019C   16002.49921083  .00000000  00000-0  00000-0 0   560
2 41929 049.9344 338.1882 6058496 022.6497 174.4363 00.27904573    06

The mean motion of 00.27904573 is an orbit of 3.5836420 days

It was later identified as an upper stage for a Chinese launch, so the provisional identifier didn't get turned into a solar system body, which might explain why you can't find it in Horizons.

It has a ground track that looks a bit like a captains sleeve insignia.

I can only guess 509356 is not S509356.

JPL's Horizons doesn't appear to recognise any of the identifiers in the linked TLE for that designator

\# Worst residual: 6.23 km
\# MJD 57389.000000 (2016 Jan  2  0:00)
2015-019C = NORAD 41929 = S509356 = WJ2AD07
1 41929U 15019C   16002.49921083  .00000000  00000-0  00000-0 0   560
2 41929 049.9344 338.1882 6058496 022.6497 174.4363 00.27904573    06

The mean motion of 00.27904573 is an orbit of 3.5836420 days

It was later identified^* as an upper stage for a Chinese launch, so the provisional identifier didn't get turned into a solar system body, which might explain why you can't find it in Horizons.

It has a ground track that looks a bit like a captains sleeve insignia.

*</sup?>_{WJ2AD07 was not a minor planet (May 11.43 UT) (FindOrb indicates LAUNCH at 9 May 2015 16:02:48 lat +32.9 lon W68.7)}

I can only guess 509356 is not S509356.

JPL's Horizons doesn't appear to recognise any of the identifiers in this TLE for that designator

\# Worst residual: 6.23 km
\# MJD 57389.000000 (2016 Jan  2  0:00)
2015-019C = NORAD 41929 = S509356 = WJ2AD07
1 41929U 15019C   16002.49921083  .00000000  00000-0  00000-0 0   560
2 41929 049.9344 338.1882 6058496 022.6497 174.4363 00.27904573    06

The mean motion of 00.27904573 is an orbit of 3.5836420 days

I can only guess 509356 is not S509356.

JPL's Horizons doesn't appear to recognise any of the identifiers in the linked TLE for that designator

\# Worst residual: 6.23 km
\# MJD 57389.000000 (2016 Jan  2  0:00)
2015-019C = NORAD 41929 = S509356 = WJ2AD07
1 41929U 15019C   16002.49921083  .00000000  00000-0  00000-0 0   560
2 41929 049.9344 338.1882 6058496 022.6497 174.4363 00.27904573    06

The mean motion of 00.27904573 is an orbit of 3.5836420 days

It was later identified as an upper stage for a Chinese launch, so the provisional identifier didn't get turned into a solar system body, which might explain why you can't find it in Horizons.

It has a ground track that looks a bit like a captains sleeve insignia.

I can only guess 509356 is not S509356. New Horizons doesn't appear to recognise any of the identifiers in this TLE for that designator

\# Worst residual: 6.23 km
\# MJD 57389.000000 (2016 Jan  2  0:00)
2015-019C = NORAD 41929 = S509356 = WJ2AD07
1 41929U 15019C   16002.49921083  .00000000  00000-0  00000-0 0   560
2 41929 049.9344 338.1882 6058496 022.6497 174.4363 00.27904573    06

The mean motion of 00.27904573 is an orbit of 3.5836420 days

I can only guess 509356 is not S509356.

JPL's Horizons doesn't appear to recognise any of the identifiers in this TLE for that designator

\# Worst residual: 6.23 km
\# MJD 57389.000000 (2016 Jan  2  0:00)
2015-019C = NORAD 41929 = S509356 = WJ2AD07
1 41929U 15019C   16002.49921083  .00000000  00000-0  00000-0 0   560
2 41929 049.9344 338.1882 6058496 022.6497 174.4363 00.27904573    06

The mean motion of 00.27904573 is an orbit of 3.5836420 days