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    • MPEC 2019-A211: 2017 BK123

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    M.P.E.C. 2019-A211                               Issued 2019 Jan. 13, 12:53 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

                                  2017 BK123

                           Revision to MPEC 2017-C50

Additional Observations:
     K17BC3K  C2015 01 24.41022008 46 12.961+31 30 31.26         22.7 GVEA211F51
     K17BC3K  C2015 01 24.42195408 46 11.321+31 30 41.56         23.1 GVEA211F51
     K17BC3K  C2015 02 12.42729407 58 02.882+35 11 53.47         22.5 GVEA211F51
     K17BC3K  C2015 02 12.43949007 58 00.933+35 11 59.28         22.3 GVEA211F51
     K17BC3K  C2015 12 02.46794504 43 37.847+14 52 13.13         21.6 GVEA211F51
     K17BC3K  C2015 12 02.47989104 43 36.025+14 52 14.68         21.8 GVEA211F51
     K17BC3K  C2015 12 02.49163504 43 34.276+14 52 15.21         21.6 GVEA211F51
     K17BC3K  C2015 12 02.50342304 43 32.512+14 52 16.36         21.8 GVEA211F51
     K17BC3K  C2015 12 04.30106604 39 11.417+14 55 18.48         22.1 GVEA211F51
     K17BC3K  C2015 12 04.31505904 39 09.397+14 55 20.00         22.6 GVEA211F51
     K17BC3K  C2015 12 04.32846704 39 07.417+14 55 21.31         21.9 GVEA211F51
     K17BC3K  C2015 12 04.34188904 39 05.445+14 55 22.83         22.5 GVEA211F51
     K17BC3K  C2015 12 05.45967004 36 25.601+14 57 16.15         22.4 GVEA211F51
     K17BC3K  C2015 12 05.47168404 36 23.869+14 57 17.40         22.1 GVEA211F51
     K17BC3K  C2015 12 05.48367104 36 22.122+14 57 18.50         22.2 GVEA211F51
     K17BC3K  C2015 12 05.49574804 36 20.381+14 57 19.59         22.0 GVEA211F51
     K17BC3K  C2015 12 08.45199204 29 32.655+15 02 19.45         21.9 GVEA211F51
     K17BC3K  C2015 12 08.46325704 29 31.114+15 02 20.49         21.8 GVEA211F51
     K17BC3K  C2015 12 08.47442704 29 29.571+15 02 21.86         22.5 GVEA211F51
     K17BC3K  C2015 12 08.48554304 29 28.017+15 02 22.94         22.5 GVEA211F51

Observer details:
F51 Pan-STARRS 1, Haleakala.  Observers J. Bulger, K. Chambers, T. Lowe,
    E. Magnier, A. Schultz, M. Willman.  Measurers S. Chastel, M. Huber,
    Y. Ramanjooloo, R. Wainscoat, R. Weryk.  1.8-m Ritchey-Chretien + CCD.

First and last observations above in comparison with prediction:
Residuals in seconds of arc, reference and Delta-T
150124 F51 67.0-  4.5+    151208 F51 88.9- 23.1-    MPO409578   -0.041 day

Orbital elements:
2017 BK123                                               Earth MOID = 0.1730 AU
Epoch 2019 Apr. 27.0 TT = JDT 2458600.5                 MPC
M  11.19087              (2000.0)            P               Q
n   0.52600203     Peri.  190.49786     +0.15756037     +0.96653842
a   1.5198863      Node    88.78644     -0.89071532     +0.22760851
e   0.7142871      Incl.   11.68180     -0.42638122     -0.11831251
P   1.87           H   20.3           G   0.15           U   2
Residuals in seconds of arc
150124 F51  0.0   0.2-    151208 F51  0.2+  0.1+    170223 G96  1.1+  0.2-
150124 F51  0.1+  0.1-    151208 F51  0.2-  0.1+    170223 G96  0.7-  0.8+
150212 F51  0.0   0.3-    170130 F51  0.4+  0.2-    170223 G96  0.7+  0.0
150212 F51  0.2-  0.0     170130 F51  0.4+  0.3-    170226 H21  0.8+  0.3+
151202 F51  0.0   0.2+    170130 F51  0.4+  0.4-    170226 H21  0.7+  0.0
151202 F51  0.4-  0.5+    170131 568  0.5+  0.2-    170226 H21  0.5+  0.5+
151202 F51  0.1-  0.1-    170131 568  0.5+  0.2-    170311 705  0.3+  0.0
151202 F51  0.1+  0.1-    170131 568  0.5+  0.2-    170311 705  0.3+  0.5+
151204 F51  0.3-  0.0     170202 291  0.3+  0.3+    170311 705  1.1+  0.5+
151204 F51  0.1+  0.0     170202 291  0.2+  0.2-    170319 G96  0.4+  0.1+
151204 F51  0.1-  0.1-    170202 291  0.4+  0.1+    170319 G96  0.2+  0.1+
151204 F51  0.1-  0.1-    170204 291  0.6-  0.2+    170319 G96  0.0   0.1+
151205 F51  0.1+  0.0     170204 291  0.8-  0.1+    170319 G96  0.2-  0.2+
151205 F51  0.2+  0.0     170204 291  0.6-  0.1+    170324 T12  0.1+  0.2+
151205 F51  0.0   0.0     170216 291  1.1-  0.1+    170324 T12  0.2+  0.2+
151205 F51  0.1+  0.1-    170216 291  0.4-  0.0     170324 T12  0.0   0.2+
151208 F51  0.1+  0.1-    170216 291  0.7-  0.3+
151208 F51  0.3+  0.1-    170223 G96  0.5+  0.1+

Ephemeris:
2017 BK123               a,e,i = 1.52, 0.71, 12                  q = 0.4343
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
2018 12 14    11 49 42.4 +12 41 14   1.4030  1.7018    89.1    35.3    23.6
...
2018 12 29    12 24 22.1 +11 40 42   1.1184  1.5634    95.9    38.7    23.1
...
2019 01 06    12 46 10.8 +11 14 32   0.9725  1.4839    98.7    40.9    22.7
...
2019 01 12    13 04 56.6 +10 57 28   0.8671  1.4215   100.2    42.9    22.4
2019 01 13    13 08 19.8 +10 54 46   0.8500  1.4108   100.4    43.3    22.4
2019 01 14    13 11 48.2 +10 52 06   0.8329  1.4001   100.5    43.7    22.3
...
2019 01 20    13 34 43.7 +10 36 06   0.7339  1.3343   100.9    46.4    22.0
...
2019 01 28    14 12 45.3 +10 10 32   0.6123  1.2424    99.5    51.4    21.6
...
2019 02 12    16 02 11.5 +08 10 55   0.4387  1.0568    86.7    68.8    21.0

A. U. Tomatic                (C) Copyright 2019 MPC           M.P.E.C. 2019-A211

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