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  • MPEC 2019-J94 : 2012 JR4

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    M.P.E.C. 2019-J94                                Issued 2019 May 12, 16:46 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 JR4
    
                               Revision to MPEC 2012-J47
    
    Additional Observations:
         K12J04R  C2019 05 08.49252 14 33 14.754+09 51 45.48         21.0 wUEJ094F51
         K12J04R  C2019 05 08.50412 14 33 12.286+09 50 30.79         21.2 wUEJ094F51
         K12J04R  C2019 05 08.51570 14 33 09.815+09 49 15.65         21.0 wUEJ094F51
         K12J04R |C2019 05 10.11778 14 28 10.93 +06 58 13.2          20.7 VuEJ094807
         K12J04R |C2019 05 10.12249 14 28 09.93 +06 57 43.1          20.7 VuEJ094807
         K12J04R |C2019 05 10.12708 14 28 08.97 +06 57 14.5          20.9 VuEJ094807
         K12J04R KC2019 05 10.21276 14 27 52.65 +06 46 54.3          20.6 GUEJ094H36
         K12J04R KC2019 05 10.22176 14 27 50.88 +06 45 56.9          20.9 GUEJ094H36
         K12J04R KC2019 05 10.23077 14 27 49.14 +06 44 58.5          21.0 GUEJ094H36
         K12J04R KC2019 05 10.92642414 25 42.07 +05 30 26.1          21.3 GVEJ094L01
         K12J04R IC2019 05 10.93433314 25 40.48 +05 29 34.4          21.1 GVEJ094L01
    
    Observer details:
    807 Cerro Tololo Observatory, La Serena.  Observers T. Linder, R. Holmes.
        0.61-m f/6.5 astrograph + 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.
    H36 Sandlot Observatory, Scranton.  Observer G. Hug.  0.56-m reflector + CCD.
    L01 Visnjan Observatory, Tican.  Observer K. Korlevic.  1.0-m f/2.9 reflector
        + CCD.
    
    First and last observations above in comparison with prediction:
    Residuals in seconds of arc (or integer in degrees), reference and Delta-T
    190508 F51   91+   27-    190510 L01   87+   30-    MPO231354    -49 day
    
    Orbital elements:
    2012 JR4                                                 Earth MOID = 0.1402 AU
    Epoch 2019 Apr. 27.0 TT = JDT 2458600.5                 MPC
    M  35.08552              (2000.0)            P               Q
    n   0.70337756     Peri.  113.46023     -0.95659860     -0.19059415
    a   1.2522096      Node    56.24293     +0.05051111     -0.85345406
    e   0.1392906      Incl.   15.37531     +0.28699783     -0.48506704
    P   1.40           H   24.0           G   0.15           U   4
    Residuals in seconds of arc
    120513 G96  0.1+  0.1-    120514 H36  0.0   0.2+    120520 F51  0.0   0.0
    120513 G96  0.1-  0.2-    120514 G96  0.9-  0.5-    120520 F51  0.1+  0.1+
    120513 G96  0.2+  0.2+    120514 G96  0.3+  0.2-    120520 F51  0.1-  0.0
    120513 G96  0.7+  0.1-    120514 G96  0.2+  0.1-    190508 F51  0.0   0.1-
    120513 G96  0.5+  0.5+    120514 G96  0.2-  0.1+    190508 F51  0.1+  0.2+
    120513 G96  0.4+  0.1+    120515 H21  0.8+  0.5-    190508 F51  0.0   0.1-
    120513 G96  0.3+  0.2+    120515 H21  0.2-  0.0     190510 807  0.6+  0.3-
    120513 G96  0.0   0.2-    120516 033  0.8-  0.6+    190510 807  0.1+  0.2-
    120513 291  0.1+  0.4-    120516 033  0.1-  0.9+    190510 807  0.1-  0.7+
    120513 291  0.2-  0.3-    120517 H21  0.4-  0.8-    190510 H36  1.3-  0.1-
    120513 291  0.3-  0.2-    120517 H21  0.9-  0.5-    190510 H36  0.3-  0.4+
    120513 J95  0.8-  0.4+    120517 H21  0.5-  0.1+    190510 H36  1.2+  0.1-
    120514 J95  0.2+  0.1+    120519 F51  0.1-  0.4-    190510 L01  0.4-  0.3+
    120514 J95  0.5+  0.1+    120519 F51  0.2+  0.2-    190510 L01  0.6-  0.7-
    120514 H36  1.0+  0.4-    120519 F51  0.2-  0.1+
    120514 H36  0.4+  0.2+    120520 F51  0.3+  0.2+
    
    Ephemeris:
    2012 JR4                 a,e,i = 1.25, 0.14, 15                  q = 1.0778
    Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
    2019 04 12    16 00 20.1 +43 13 31   0.1860  1.0987   116.8    54.5    22.5
    ...
    2019 04 27    15 13 09.3 +28 34 07   0.1508  1.1191   135.6    39.0    21.7
    ...
    2019 05 05    14 44 53.9 +16 01 36   0.1430  1.1321   147.9    28.2    21.3
    ...
    2019 05 11    14 25 28.9 +05 23 18   0.1454  1.1428   154.5    22.3    21.2
    2019 05 12    14 22 31.5 +03 36 54   0.1465  1.1446   155.1    21.8    21.2
    2019 05 13    14 19 39.6 +01 51 31   0.1479  1.1465   155.5    21.5    21.2
    ...
    2019 05 19    14 04 37.0 -08 02 59   0.1605  1.1579   154.0    22.5    21.4
    ...
    2019 05 27    13 50 37.2 -18 48 24   0.1873  1.1739   146.5    28.4    22.0
    ...
    2019 06 11    13 42 27.9 -31 41 18   0.2586  1.2054   132.6    38.3    23.0
    
    A. U. Tomatic                (C) Copyright 2019 MPC           M.P.E.C. 2019-J94
    

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