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    • MPEC 2018-A84 : 2018 AB4

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    M.P.E.C. 2018-A84                                Issued 2018 Jan. 15, 18:15 UT

     The Minor Planet Electronic Circulars contain information on unusual
         minor planets and routine data on comets.  They are published
    on behalf of Division F of the International Astronomical Union by the
          Minor Planet Center, Smithsonian Astrophysical Observatory,
                          Cambridge, MA 02138, U.S.A.

             Prepared using the Tamkin Foundation Computer Network

                              MPC@CFA.HARVARD.EDU
            URL https://www.minorplanetcenter.net/    ISSN 1523-6714

                                   2018 AB4

Observations:
     K18A04B* C2018 01 13.30539 08 20 57.36 +23 48 55.8          20.6 GUEA084G96
     K18A04B  C2018 01 13.31054 08 20 57.30 +23 49 04.1          21.2 GUEA084G96
     K18A04B  C2018 01 13.31571 08 20 57.23 +23 49 13.8          21.7 GUEA084G96
     K18A04B  C2018 01 13.32087 08 20 57.16 +23 49 22.9          21.1 GUEA084G96
     K18A04B KC2018 01 13.35867 08 20 56.07 +23 50 31.0                oEA084711
     K18A04B KC2018 01 13.36229 08 20 56.03 +23 50 37.2                oEA084711
     K18A04B KC2018 01 13.36592 08 20 55.98 +23 50 43.2                oEA084711
     K18A04B  C2018 01 13.37629 08 20 56.32 +23 50 58.8          21.4 GUEA084I52
     K18A04B  C2018 01 13.37960 08 20 56.34 +23 51 04.2                UEA084I52
     K18A04B  C2018 01 13.38292 08 20 56.31 +23 51 10.4                UEA084I52
     K18A04B  C2018 01 14.21238 08 21 11.94 +24 15 02.7          21.5 GUEA084I52
     K18A04B  C2018 01 14.22066 08 21 11.86 +24 15 17.8          22.0 GUEA084I52
     K18A04B  C2018 01 14.22480 08 21 11.85 +24 15 25.3          22.5 GUEA084I52
     K18A04B IC2018 01 14.27825 08 21 10.72 +24 17 05.4                oEA084711
     K18A04B KC2018 01 14.28251 08 21 10.66 +24 17 12.7                oEA084711
     K18A04B KC2018 01 14.28688 08 21 10.59 +24 17 20.3                oEA084711
     K18A04B KC2018 01 15.33256 08 21 21.53 +24 47 13.1                oEA084711
     K18A04B KC2018 01 15.33843 08 21 21.44 +24 47 22.8                oEA084711
     K18A04B KC2018 01 15.34275 08 21 21.34 +24 47 30.0                oEA084711

Observer details:
711 McDonald Observatory.  Observer J. G. Ries.  2.1-m reflector + CCD + focal
    reducer.
G96 Mt. Lemmon Survey.  Observer D. C. Fuls.  Measurers E. J. Christensen,
    D. C. Fuls, A. R. Gibbs, A. D. Grauer, J. A. Johnson, R. A. Kowalski,
    S. M. Larson, G. J. Leonard, R. G. Matheny, R. L. Seaman, F. C. Shelly.
    1.5-m reflector + 10K CCD.
I52 Steward Observatory, Mt. Lemmon Station.  Observers R. G. Matheny,
    J. A. Johnson.  Measurers E. J. Christensen, D. C. Fuls, A. R. Gibbs,
    A. D. Grauer, J. A. Johnson, R. A. Kowalski, S. M. Larson, G. J. Leonard,
    R. G. Matheny, R. L. Seaman, F. C. Shelly.  1.0-m reflector + CCD.

Orbital elements:
2018 AB4                                                 Earth MOID = 0.1136 AU
Epoch 2017 Sept. 4.0 TT = JDT 2458000.5                 MPC
M 284.61176              (2000.0)            P               Q
n   0.68308561     Peri.  348.44147     -0.08144473     -0.99499878
a   1.2768875      Node   106.21007     +0.91916694     -0.09741778
e   0.1423147      Incl.    3.45262     +0.38535553     +0.02207259
P   1.44           H   25.5           G   0.15           U   7
Residuals in seconds of arc
180113 G96  0.3+  0.4+    180113 I52  0.8-  0.4-    180114 711  0.5-  0.0
180113 G96  0.4+  0.5-    180113 I52  0.0   0.6-    180114 711  0.6-  0.1-
180113 G96  0.3+  0.0     180113 I52  0.2+  0.1-    180115 711  0.2+  0.1+
180113 G96  0.3+  0.0     180114 I52  0.2+  0.2+    180115 711  0.4+  0.1-
180113 711  0.1-  0.4+    180114 I52  0.1-  0.0     180115 711  0.1+  0.1-
180113 711  0.0   0.4+    180114 I52  0.2+  0.0
180113 711  0.0   0.2+    180114 711  0.6-  0.2+

Ephemeris:
2018 AB4                 a,e,i = 1.28, 0.14, 3                   q = 1.0952
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
2017 12 16    07 55 46.3 +11 44 11   0.1342  1.0961   144.3    31.6    22.7
...
2017 12 31    08 13 55.1 +17 22 16   0.1211  1.0961   157.3    20.2    22.1
...
2018 01 08    08 19 06.5 +21 12 36   0.1195  1.0993   165.2    13.2    21.9
...
2018 01 14    08 21 05.9 +24 09 12   0.1210  1.1031   170.5     8.5    21.7
2018 01 15    08 21 18.2 +24 37 52   0.1215  1.1039   171.1     7.9    21.7
2018 01 16    08 21 28.8 +25 06 09   0.1221  1.1047   171.7     7.4    21.7
...
2018 01 22    08 22 08.1 +27 44 25   0.1270  1.1100   171.9     7.2    21.8
...
2018 01 30    08 22 55.8 +30 32 55   0.1375  1.1189   165.9    12.3    22.2
...
2018 02 14    08 28 10.1 +33 12 07   0.1687  1.1401   152.8    23.3    23.0

A. U. Tomatic                (C) Copyright 2018 MPC           M.P.E.C. 2018-A84

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