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  • MPEC 2020-X61 : 2012 XA

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    M.P.E.C. 2020-X61                              Issued 2020 December 8, 06:37 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
    
                                     2012 XA                                 
    
    
                                Revision to MPEC 2012-X6                            
    
    Additional Observations:
         K12X00A  C2020 11 13.19082601 07 43.04 +29 57 01.8          21.41GVEX061G96
         K12X00A  C2020 11 13.19605001 07 42.96 +29 56 51.8          21.55GVEX061G96
         K12X00A  C2020 11 13.20127801 07 42.80 +29 56 42.0          22.36GVEX061G96
         K12X00A  C2020 11 13.20657801 07 42.68 +29 56 31.2          21.45GVEX061G96
         K12X00A  C2020 12 06.33440001 46 41.655+05 57 19.76         20.05wUEX061F51
         K12X00A  C2020 12 06.34448001 46 43.410+05 56 17.85         20.99wUEX061F51
         K12X00A  C2020 12 06.35435001 46 45.148+05 55 17.22         21.63wUEX061F51
         K12X00A  C2020 12 06.36434701 46 46.925+05 54 15.99         20.99wUEX061F51
         K12X00A KC2020 12 07.07889101 49 42.26 +04 39 53.5          19.98GVEX061I52
         K12X00A KC2020 12 07.08057201 49 42.59 +04 39 43.0          20.11GVEX061I52
         K12X00A KC2020 12 07.08225401 49 42.95 +04 39 33.0          20.18GVEX061I52
         K12X00A KC2020 12 07.08393601 49 43.24 +04 39 22.0          20.60GVEX061I52
         K12X00A |C2020 12 08.09173 01 53 46.07 +02 54 04.2          20.4 VuEX061807
         K12X00A |C2020 12 08.09939 01 53 47.63 +02 53 13.9          20.2 VuEX061807
         K12X00A |C2020 12 08.10685 01 53 49.14 +02 52 25.0          20.2 VuEX061807
         K12X00A KC2020 12 08.10919 01 53 55.39 +02 49 39.2          20.8 RoEX061691
         K12X00A KC2020 12 08.11344 01 53 56.30 +02 49 11.7          19.6 RoEX061691
         K12X00A KC2020 12 08.11656401 53 56.81 +02 48 49.6          19.42GVEX061I52
         K12X00A KC2020 12 08.11770 01 53 57.19 +02 48 43.5          20.0 RoEX061691
         K12X00A KC2020 12 08.11782301 53 57.07 +02 48 41.5          19.97GVEX061I52
         K12X00A KC2020 12 08.11909201 53 57.33 +02 48 32.7          20.28GVEX061I52
         K12X00A KC2020 12 08.12035101 53 57.50 +02 48 28.5                VEX061I52
         K12X00A KC2020 12 08.13614401 54 00.16 +02 46 35.6          20.7 VqEX061858
         K12X00A KC2020 12 08.14660401 54 02.26 +02 45 27.3          20.4 VqEX061858
         K12X00A KC2020 12 08.15358801 54 03.70 +02 44 41.6          20.1 VqEX061858
    
    Observer details:
    691 Steward Observatory, Kitt Peak-Spacewatch.  Observer M. T. Read.  0.9-m
        f/3 reflector + CCD.
    807 Cerro Tololo Observatory, La Serena.  Observers T. Linder, R. Holmes.
        0.61-m f/6.5 astrograph + CCD.
    858 Tebbutt Observatory, Edgewood.  Observer F. B. Zoltowski.  0.51-m Schmidt-
        Cassegrain + CCD.
    F51 Pan-STARRS 1, Haleakala.  Observers J. Bulger, 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.
    G96 Mt. Lemmon Survey.  Observer D. Rankin.  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.  1.5-m reflector + 10K 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
    201113 G96    9-    4-    201208 858   19-    0-    MPO252136   -1.16 days
    
    Orbital elements:
    2012 XA                                                  Earth MOID = 0.0373 AU
    Epoch 2020 Dec. 17.0 TT = JDT 2459200.5                 Bell                    
    M 351.50160              (2000.0)            P               Q                  
    n   0.61485894     Peri.  209.29161     -0.14318429     -0.98487341             
    a   1.3696798      Node   249.08534     +0.92714747     -0.09898480             
    e   0.2659410      Incl.    5.99646     +0.34625976     -0.14221948             
    P   1.60           H   24.84          G   0.15           U   0                  
    Residuals in seconds of arc
    121202 G96  0.2-  0.1+    121203 H36  1.4-  0.6+    121214 807  0.2+  0.1+
    121202 G96  0.1+  0.1+    121203 118  0.9+  1.0-    121216 807  0.1+  0.0+
    121202 G96  0.0-  0.0+    121203 118  0.2+  0.1+    121216 807  0.1+  0.0+
    121202 G96  0.1-  0.1-    121203 118  1.2+  0.9-    121216 807  0.0-  0.0-
    121202 G96  0.2-  0.6+    121203 J95  0.4+  0.2+    121216 807  0.1+  0.0-
    121202 G96  0.0-  0.2+    121203 J95  0.4-  0.3-    121216 807  0.1+  0.1-
    121202 G96  0.0+  0.4+    121205 703  1.0-  0.1+    121221 807  0.1+  0.0+
    121202 H36  0.6-  0.0+    121205 703  1.1-  0.2+    121221 807  0.2+  0.1+
    121202 H36  0.3+  0.4-    121205 703  0.5-  0.5-    121221 807  0.0-  0.0-
    121202 H36  1.4+  0.1+    121207 807  0.0-  0.2+    121221 807  0.1-  0.1-
    121202 A24 (1.9+  0.5-)   121207 807  0.1+  0.0+    121223 807  0.1+  0.2-
    121202 A24  0.0+  0.2+    121207 807  0.1-  0.3+    121223 807  0.1+  0.0-
    121202 A24  0.4+  0.0-    121207 807  0.2-  0.1+    121223 807  0.1+  0.1-
    121202 204  0.6+  0.2-    121208 033 (3.7-  5.0+)   121223 807  0.1+  0.1-
    121202 204  1.2+  0.4-    121208 033 (3.5-  4.1+)   121223 807  0.1+  0.0+
    121202 204  0.1-  0.3+    121209 474  0.7-  0.1-    201113 G96  0.6-  0.0-
    121203 H06  0.2-  0.3+    121209 474  0.3+  0.1+    201113 G96  0.2+  0.1+
    121203 H06  0.2-  0.4+    121209 474  0.0-  0.6+    201113 G96  0.1-  0.5+
    121203 H06  0.3-  0.5+    121209 474  0.3-  0.4+    201113 G96  0.1+  0.0+
    121203 G48  1.4+  1.1-    121210 807  0.3-  0.1+    201206 F51  0.0-  0.0-
    121203 G48  1.3+  0.0-    121210 807  0.4-  0.2+    201206 F51  0.1-  0.1-
    121203 I19  1.3+  0.0+    121210 807  0.3-  0.3+    201206 F51  0.0-  0.1-
    121203 G48  0.2-  0.4+    121210 807  0.4-  0.2+    201206 F51  0.1+  0.1+
    121203 I19  0.4-  0.6+    121210 807  0.1-  0.1+    201207 I52  0.0+  0.1-
    121203 I19  0.1-  0.5-    121210 474  0.7-  0.6+    201207 I52  0.1-  0.1-
    121203 G96  0.2-  0.4+    121210 474  0.1+  0.0+    201207 I52  0.4+  0.4+
    121203 G96  0.2-  0.3+    121210 474  0.1+  0.2+    201207 I52  0.2-  0.1-
    121203 G96  0.2-  0.5+    121210 474  0.2+  0.4-    201208 807  0.4+  0.2-
    121203 G96  0.0-  0.4+    121211 807  0.1-  0.1-    201208 807  0.6+  0.3-
    121203 G96  0.3-  0.4+    121211 807  0.2-  0.1+    201208 807  0.5+  0.3-
    121203 G96  0.2-  0.5+    121211 807  0.1-  0.1-    201208 691  0.4-  0.2-
    121203 G96  0.0-  0.3+    121212 807  0.1-  0.1+    201208 691  0.1+  0.1+
    121203 G96  0.1+  0.2+    121212 807  0.1-  0.1+    201208 I52  0.3-  0.3-
    121203 807  0.1+  0.1-    121212 807  0.1-  0.1+    201208 691  0.3+  0.3-
    121203 807  0.1+  0.1+    121212 807  0.1-  0.1+    201208 I52  0.2-  0.0-
    121203 807  0.0+  0.2+    121212 807  0.0-  0.0-    201208 I52  0.3-  0.6-
    121203 807  0.0+  0.1+    121214 807  0.1-  0.0-    201208 I52 (1.6-  3.5+)
    121203 807  0.1+  0.2+    121214 807  0.0-  0.1+    201208 858  0.2+  0.4-
    121203 H36 (3.0+  0.8-)   121214 807  0.0-  0.2+    201208 858  0.5-  0.2-
    121203 H36 (1.8+  0.8-)   121214 807  0.0+  0.3+    201208 858  0.3-  0.1-
    
    Ephemeris:
    2012 XA                  a,e,i = 1.37, 0.27, 6                   q = 1.0054
    Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase     V
    2020 11 08    01 08 17.6 +32 21 47   0.1252  1.1024   151.5    25.4    21.7
    ...
    2020 11 23    01 14 02.4 +22 55 56   0.08686 1.0578   142.6    34.5    21.1
    ...
    2020 12 01    01 29 34.2 +14 02 27   0.07079 1.0387   136.8    40.6    20.8
    ...
    2020 12 07    01 49 18.7 +04 49 22   0.06123 1.0270   131.8    45.7    20.6
    2020 12 08    01 53 24.2 +03 02 49   0.05990 1.0252   130.9    46.6    20.5
    2020 12 09    01 57 44.7 +01 12 13   0.05866 1.0236   130.0    47.5    20.5
    ...
    2020 12 15    02 29 33.6 -11 02 37   0.05329 1.0151   124.0    53.5    20.5
    ...
    2020 12 23    03 28 50.2 -28 02 35   0.05244 1.0078   116.1    61.2    20.6
    ...
    2021 01 07    05 49 57.5 -46 07 50   0.06778 1.0074   109.0    67.4    21.4
    
    M. P. C. Staff               (C) Copyright 2020 MPC           M.P.E.C. 2020-X61
    


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