[Iaude] MPEC L56: 2017 XL2 [a=1.99,e=0.66,i=16.9,H=21.3]

mpec at marsden.cfa.harvard.edu mpec at marsden.cfa.harvard.edu
Sat Jun 13 12:56:44 EDT 2020


M.P.E.C. 2020-L56                                 Issued 2020 June 13, 16:52 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 at CFA.HARVARD.EDU
            URL https://www.minorplanetcenter.net/    ISSN 1523-6714

                                    2017 XL2                                    


                           Revision to MPEC 2017-X118                           

Additional Observations:
     K17X02L  C2020 06 11.34785314 41 00.51 -38 43 59.3          19.10oVEL056T08
     K17X02L  C2020 06 11.35154114 40 58.23 -38 43 41.4          18.77oVEL056T08
     K17X02L  C2020 06 11.35707714 40 54.94 -38 43 13.2          18.68oVEL056T08
     K17X02L  C2020 06 11.36909914 40 47.68 -38 42 13.6          18.95oVEL056T08
     K17X02L 1C2020 06 11.55823 14 38 57.70 -38 25 36.8                VEL056Q62
     K17X02L 1C2020 06 11.56089 14 38 56.08 -38 25 22.7                VEL056Q62
     K17X02L 1C2020 06 11.56356 14 38 54.50 -38 25 08.7          19.0 GVEL056Q62
     K17X02L KC2020 06 13.02748 14 23 59.58 -36 04 31.7          18.4 GVEL056W99
     K17X02L KC2020 06 13.03288 14 23 55.92 -36 03 57.0          18.5 GVEL056W99
     K17X02L KC2020 06 13.03834 14 23 52.22 -36 03 21.8          18.6 GVEL056W99
     K17X02L KC2020 06 13.36216614 20 20.21 -35 26 59.0          18.7 GVEL056474
     K17X02L KC2020 06 13.36360614 20 19.22 -35 26 49.3          18.8 GVEL056474
     K17X02L KC2020 06 13.36624414 20 17.41 -35 26 31.2          18.7 GVEL056474
     K17X02L KC2020 06 13.36985814 20 14.92 -35 26 06.7          18.9 GVEL056474

Observer details:
474 Mount John Observatory, Lake Tekapo.  Observers A. C. Gilmore, P. M.
    Kilmartin.  Measurer P. M. Kilmartin.  1.0-m f/7.7 reflector + CCD.
Q62 iTelescope Observatory, Siding Spring.  Observer H. Sato.  0.51-m f/6.8
    astrograph + CCD + f/4.5 focal reducer.
T08 ATLAS-MLO, Mauna Loa.  Observers L. Denneau, J. Tonry, A. Heinze, H.
    Weiland, H. Flewelling.  Measurers L. Denneau, J. Tonry, A. Heinze, H.
    Weiland, H. Flewelling, B. Stalder, A. Fitzsimmons, J. Robinson, N.
    Erasmus.  0.5-m reflector + CCD.
W99 SON, San Pedro de Atacama Station.  Observer A. Maury.  Measurer G.
    Attard.  0.35-m reflector + CCD.

First and last observations above in comparison with prediction:
Residuals in seconds of arc (or two decimals in degrees), reference and Delta-T
200611 T08 0.16- 0.08-    200613 474 0.14- 0.08-    MPO473491   -0.05 days

Orbital elements:
2017 XL2                                            PHA, Earth MOID = 0.0026 AU
Epoch 2020 May 31.0 TT = JDT 2459000.5                  Veres
M 335.25633              (2000.0)            P               Q
n   0.35023744     Peri.   82.07625     +0.93685114     +0.19436199
a   1.9932465      Node   266.36750     -0.29608020     +0.88325560
e   0.6636416      Incl.   16.93769     +0.18613557     +0.42671180
P   2.81           H   21.3           G   0.15           U   1
Residuals in seconds of arc
171209 T05  0.2-  0.3+    171212 926  0.0   0.3+    171226 691  0.1-  0.0
171209 T05  0.5+  0.1+    171212 926  0.1-  0.2+    171226 691  0.0   0.2+
171209 T05  0.0   0.3+    171212 926  0.7-  0.2+    171226 G96  0.2-  0.2+
171209 T05  0.1+  0.2-    171212 G34  0.1-  0.5-    171226 G96  0.2-  0.0
171209 104  0.1-  0.3+    171212 G34  0.4-  0.7+    171226 G96  0.1+  0.1+
171209 104  0.2-  0.3+    171212 G34  0.1+  0.7-    171226 G96  0.1-  0.2+
171209 104  0.1-  0.3+    171212 C77  0.2-  0.3+    180104 F51  0.1-  0.4+
171209 595  0.0   0.1+    171212 C77  0.7-  0.2+    180104 F51  0.1+  0.1-
171209 595  0.2-  0.3+    171212 C77  0.1+  0.1+    180104 F51  0.1-  0.2+
171209 595  0.0   0.1+    171212 B49  0.4-  0.2-    180105 I52  0.2-  0.4+
171209 L01  0.0   0.2+    171212 B49  0.0   0.4-    180105 I52  0.8-  0.5+
171209 L01  0.3+  0.2+    171212 B49  0.3+  0.1+    180105 I52  0.3+  0.6+
171210 H21  0.0   0.1+    171212 033  0.0   0.3-    180105 I52  0.1+  0.0
171210 H21  0.1-  0.1+    171212 033  0.2-  0.5+    180105 291  0.0   0.1-
171210 H21  0.0   0.1+    171212 033  0.1+  0.1-    180105 291  0.0   0.1+
171210 H36  0.3+  0.6-    171212 033  0.1-  0.2+    180105 291  0.2+  0.0
171210 H36  0.6+  0.1-    171212 B74  0.1-  0.1-    180111 F51  0.1+  0.1+
171210 H36  0.5+  0.0     171212 B74  0.2+  0.2-    180111 F51  0.1+  0.1+
171210 H36  0.1-  0.1+    171212 B74  0.2+  0.1-    180111 F51  0.3-  0.1-
171210 U69  0.7+  0.2-    171213 926  0.1-  0.1+    180111 F51  0.2+  0.3-
171210 U69  0.4+  0.3-    171213 926  0.0   0.3+    180111 F51  0.1+  0.1-
171210 L04  0.2+  0.3-    171213 926  0.2-  0.3+    180111 F51  0.2+  0.2-
171210 L04  0.1+  0.0     171213 I52  0.0   0.0     180111 F51  0.1-  0.0
171210 L04  0.4+  0.1-    171213 I52  0.0   0.2+    180119 H21  0.1+  0.2-
171210 L04  0.2-  0.1+    171213 I52  0.2-  0.0     180119 H21  0.3+  0.1-
171210 W34  0.5-  0.1-    171213 I52  0.1-  0.1+    180119 H21  0.0   0.3-
171210 W34  0.3-  0.0     171214 926  0.0   0.1+    180119 T12  0.1-  0.0
171210 W34  0.2-  0.3+    171214 926  0.1-  0.1+    180119 T12  0.0   0.0
171210 W34  0.1-  0.3-    171214 926  0.3-  0.2+    180119 T12  0.1+  0.1-
171210 W34  0.2-  0.4-    171214 I52  0.1+  0.1+    180122 291  0.3+  0.1+
171211 W34  0.1-  0.4-    171214 I52  0.0   0.1+    180122 291  0.2-  0.2-
171211 T08  0.2-  0.1-    171214 I52  0.0   0.1+    180122 291  0.1-  0.1-
171211 T08  0.2+  0.2+    171214 I52  0.0   0.0     180205 695  0.2-  0.2+
171211 T08  0.4+  1.0-    171215 130  0.1+  0.0     180205 695  0.3-  0.2+
171211 T08  0.2+  0.5-    171215 130  0.1+  0.0     180205 695  0.1-  0.3+
171211 B49  1.0-  0.5-    171215 130  0.1-  0.4+    200611 T08  0.3+  0.5+
171211 B49  0.6-  0.6-    171218 T08  0.1-  0.6-    200611 T08  0.4-  0.0
171211 B49  0.4-  0.4-    171218 T08  0.1-  0.5+    200611 T08  0.1+  0.6+
171211 Z80  0.2-  0.5+    171218 T08  0.8+  0.8+    200611 T08  0.2-  0.0
171211 Z80  0.5+  0.0     171218 T08  0.7+  0.8+    200611 Q62  0.3-  0.6-
171211 Z80  0.2-  0.0     171220 B67  0.3-  0.6-    200611 Q62  0.4-  0.4-
171211 Z80  0.1-  0.4-    171220 B67  0.7-  0.7-    200611 Q62  0.0   0.3-
171211 Z80  0.4+  0.3-    171220 B67  0.3-  0.3-    200613 W99  0.3+  0.2-
171211 J95  0.0   0.0     171221 I52  0.1-  0.3-    200613 W99  0.3+  0.2-
171211 J95  0.0   0.0     171221 I52  0.5+  0.1+    200613 W99  0.3+  0.3-
171211 J95  0.0   0.1+    171221 I52  0.3+  0.4+    200613 474  0.1-  0.1+
171211 J69  0.4+  0.5-    171221 I52  0.3+  0.1+    200613 474  0.1-  0.0
171211 J69  0.3+  0.5-    171226 691  0.1-  0.3+    200613 474  0.1-  0.1+
171211 J69  0.2+  0.4-    171226 691  0.3-  0.3+    200613 474  0.2-  0.0

Ephemeris:
2017 XL2                 a,e,i = 1.99, 0.66, 17                  q = 0.6704
Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase     V
2020 05 14    16 36 33.5 -46 27 16   0.4770  1.4389   148.4    21.6    21.5
...
2020 05 29    16 02 42.6 -46 20 14   0.2909  1.2829   154.9    19.6    20.1
...
2020 06 06    15 23 14.2 -43 40 38   0.2035  1.1975   151.4    23.9    19.4
...
2020 06 12    14 34 39.4 -37 46 36   0.1452  1.1328   141.5    33.9    18.8
2020 06 13    14 24 16.7 -36 07 20   0.1364  1.1219   138.9    36.5    18.7
2020 06 14    14 13 07.6 -34 10 40   0.1279  1.1111   135.9    39.5    18.6
...
2020 06 20    12 48 32.2 -13 30 49   0.08915 1.0464   107.4    67.9    18.5
...
2020 06 28    10 26 06.0 +28 43 41   0.09775 0.9612    53.2   122.2    21.2
...
2020 07 13    07 38 43.6 +48 16 14   0.2347  0.8133    26.5   146.1    25.5

A. U. Tomatic                (C) Copyright 2020 MPC           M.P.E.C. 2020-L56




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