[Iaude] MPEC X138: 2009 XL8 [a=1.24,e=0.48,i=13.7,H=22.5]

mpec at marsden.cfa.harvard.edu mpec at marsden.cfa.harvard.edu
Sat Dec 12 13:10:23 EST 2020


M.P.E.C. 2020-X138                            Issued 2020 December 12, 18:07 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

                                    2009 XL8                                    


                            Revision to MPEC 2009-Y9                            

Additional Observations:
     K09X08L  C2020 12 11.40749003 47 19.687+36 33 12.44         20.86wUEX138F52
     K09X08L  C2020 12 11.41774003 47 16.259+36 32 46.20         21.03wUEX138F52
     K09X08L  C2020 12 11.42801503 47 12.823+36 32 19.67         20.70wUEX138F52
     K09X08L  C2020 12 11.43828703 47 09.410+36 31 52.95         20.84wUEX138F52
     K09X08L KC2020 12 12.24926703 42 50.70 +35 56 16.2          21.10GVEX138I52
     K09X08L KC2020 12 12.25094903 42 50.15 +35 56 11.6          20.88GVEX138I52

Observer details:
F52 Pan-STARRS 2, Haleakala.  Observers J. Bulger, T. Dukes, T. Lowe, A.
    Schultz, M. Willman.  Measurers K. Chambers, S. Chastel, T. de Boer, L.
    Denneau, J. Fairlamb, H. Flewelling, M. Huber, C.-C. Lin, E. Magnier, Y.
    Ramanjooloo, R. Wainscoat, R. Weryk.  1.8-m Ritchey-Chretien + CCD.
I52 Steward Observatory, Mt. Lemmon Station.  Observer D. C. Fuls.  Measurers
    E. J. Christensen, G. A. Farneth, D. C. Fuls, A. R. Gibbs, A. D. Grauer,
    H. Groeller, R. A. Kowalski, S. M. Larson, G. J. Leonard, T. A. Pruyne, D.
    Rankin, R. L. Seaman, F. C. Shelly, K. W. Wierzchos.  1.0-m reflector +
    CCD.

First and last observations above in comparison with prediction:
Residuals in seconds of arc (or zero decimals in degrees), reference and Delta-T
201211 F52   15+    4+    201212 I52   15+    4+    MPO167801   +8.88 days

Orbital elements:
2009 XL8                                                 Earth MOID = 0.0357 AU
Epoch 2020 Dec. 17.0 TT = JDT 2459200.5                 Veres
M 302.51086              (2000.0)            P               Q
n   0.71477427     Peri.  283.34962     -0.94443738     +0.22806323
a   1.2388635      Node   270.21986     -0.12355730     -0.91363391
e   0.4801467      Incl.   13.69175     -0.30458437     -0.33654157
P   1.38           H   22.5           G   0.15           U   5
Residuals in seconds of arc
091215 704  0.6+  1.1+    091216 H26  1.0-  0.2+    091216 926  0.1-  0.1+
091215 704  0.5-  0.6+    091216 H26  0.1-  0.2-    091216 926  0.1+  0.5+
091215 704  0.1-  0.7+    091216 H26  0.5-  0.2+    091216 926  0.1+  0.3+
091215 704  0.7+  1.1+    091216 H01  0.1-  0.0     091220 448  0.0   0.1+
091216 B33  0.5+  0.3+    091216 H01  0.1-  0.1-    091220 448  0.0   0.4-
091216 B33  0.1+  0.7+    091216 H01  0.1+  0.1-    091220 448  0.0   0.0
091216 204  0.1-  0.5-    091216 H01  0.1-  0.0     091220 448  0.1-  0.4+
091216 B33  0.1+  0.7-    091216 932  0.4+  0.1+    201211 F52  0.1+  0.2-
091216 204  0.2-  0.7-    091216 932  0.3+  0.2-    201211 F52  0.0   0.1-
091216 473  0.5+  0.7-    091216 932  0.3-  0.3-    201211 F52  0.0   0.0
091216 473  0.3+  0.7-    091216 932  0.3+  0.1+    201211 F52  0.1+  0.0
091216 H26  1.1-  0.5-    091216 H21  0.3-  0.0     201212 I52  0.2-  0.1+
091216 H26  0.5+  0.0     091216 H21  0.1-  0.2-    201212 I52  0.0   0.0
091216 H26  0.3+  0.7-    091216 H21  0.0   0.1-

Ephemeris:
2009 XL8                 a,e,i = 1.24, 0.48, 14                  q = 0.6440
Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase     V
2020 11 12    05 22 50.4 +42 49 47   0.5112  1.4284   142.2    25.1    23.0
...
2020 11 27    04 50 26.0 +42 15 18   0.3655  1.3315   157.4    16.6    21.8
...
2020 12 05    04 19 04.1 +40 04 40   0.3022  1.2754   161.4    14.3    21.2
...
2020 12 11    03 49 29.7 +36 50 07   0.2629  1.2315   157.4    17.9    21.0
2020 12 12    03 44 11.3 +36 07 25   0.2571  1.2240   156.1    19.0    21.0
2020 12 13    03 38 48.2 +35 21 29   0.2515  1.2164   154.6    20.3    20.9
...
2020 12 19    03 05 36.0 +29 35 39   0.2230  1.1704   143.3    30.1    20.9
...
2020 12 27    02 22 17.5 +18 57 44   0.1986  1.1067   124.0    47.5    21.0
...
2021 01 11    01 12 17.5 -05 18 01   0.1910  0.9822    84.1    84.8    21.8

A. U. Tomatic                (C) Copyright 2020 MPC           M.P.E.C. 2020-X138




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