[neo_followup] A10i6zC = geocentric transfer debris, probably related to ztf01nf

Sam Deen planetaryscience at yahoo.com
Sat Nov 23 12:37:49 EST 2019


Hi all,
the object A10i6zC on the NEOCP is pretty obviously an artsat:
   Perigee 2019 Nov 20.909404 +/- 0.0275 TT = 21:49:32 (JD 2458808.409404)
Epoch 2019 Nov 21.0 TT = JDT 2458808.5                        AutoNEOCP
M  33.13518455 +/- 8                (J2000 equator)
n 365.74775320 +/- 15.3             Peri.  193.14340 +/- 0.7
a 41797.3801 +/- 1165               Node    41.26207 +/- 0.21
e   0.6862850 +/- 0.0149            Incl.   32.72596 +/- 0.15
P1417.34m/0.984d           H 32.7   G  0.15   U 14.6  
q 13112.4616 +/- 1008    Q 70482.2986 +/- 1379
>From 5 observations 2019 Nov. 21 (46.9 min); mean residual 0".16and based on the orbit, I figured I'd check if it was any one of the many geocentric transfer debris we know of. The best fit I could find was ztf01nf, discovered around this time last year:
www.projectpluto.com/pluto/mpecs/ztf01nf.htm
   Perigee 2018 Nov 14.679965 +/- 0.00239 TT = 16:19:09 (JD 2458437.179965)
Epoch 2018 Nov 15.0 TT = JDT 2458437.5                        Gray
M 120.40721599 +/- 0.58             (J2000 equator)
n 376.23157195 +/- 1                Peri.  200.98066 +/- 0.06
a 41017.2633 +/- 72.9               Node    37.37637 +/- 0.0018
e   0.7805021 +/- 0.000384          Incl.   32.97280 +/- 0.0054
P1377.85m/0.957d           H 34.4   G  0.15   U 12.7
q 9003.20195 +/- 28.5    Q 73031.3248 +/- 121
>From 6 observations 2018 Nov. 15 (3.2 hr); mean residual 0".417the main problem with the linkage is that the eccentricity seems to have inexplicably decreased while keeping the semimajor axis roughly the same. Otherwise, the linkage seems pretty solid.

~Sam
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