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  • MPEC 2019-J25 : 2012 HC20

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    M.P.E.C. 2019-J25                                Issued 2019 May 4, 18:10 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 HC20
    
                               Revision to MPEC 2012-H72
    
    Additional Observations:
         K12H20C  C2019 05 01.28373 12 43 52.29 +01 25 56.2          20.7 GVEJ025G96
         K12H20C  C2019 05 01.28890 12 43 51.01 +01 25 50.1          21.1 GVEJ025G96
         K12H20C  C2019 05 01.29406 12 43 49.65 +01 25 44.6          20.7 GVEJ025G96
         K12H20C  C2019 05 01.29924 12 43 48.25 +01 25 38.2          21.6 GVEJ025G96
         K12H20C  C2019 05 01.37745 12 43 27.94 +01 24 10.8          19.7 GVEJ025I52
         K12H20C  C2019 05 01.37995 12 43 27.26 +01 24 07.7          20.9 GVEJ025I52
         K12H20C  C2019 05 01.38245 12 43 26.65 +01 24 05.3          20.4 GVEJ025I52
         K12H20C  C2019 05 01.38495 12 43 26.01 +01 24 03.1          20.3 GVEJ025I52
         K12H20C  C2019 05 01.85545 12 41 27.29 +01 14 59.6          21.8 VVEJ025033
         K12H20C  C2019 05 01.85904 12 41 26.33 +01 14 56.2          20.8 VVEJ025033
         K12H20C  C2019 05 01.86279 12 41 25.34 +01 14 51.7          20.9 VVEJ025033
         K12H20C  C2019 05 01.86638 12 41 24.42 +01 14 47.6          20.9 VVEJ025033
         K12H20C  C2019 05 01.86997 12 41 23.49 +01 14 43.4          21.1 VVEJ025033
         K12H20C KC2019 05 01.87756812 41 21.43 +01 14 36.3          20.3 GVEJ025L01
         K12H20C KC2019 05 01.88033212 41 20.70 +01 14 32.9          20.3 GVEJ025L01
         K12H20C IC2019 05 01.88230612 41 20.14 +01 14 30.5          20.4 GVEJ025L01
         K12H20C KC2019 05 01.92464 12 41 08.93 +01 13 41.3          20.4 RoEJ025K88
         K12H20C KC2019 05 01.93605 12 41 05.93 +01 13 27.7          20.6 RoEJ025K88
         K12H20C  C2019 05 02.18328 12 40 03.06 +01 08 44.0          21.0 GVEJ025I52
         K12H20C  C2019 05 02.18453 12 40 02.72 +01 08 42.7          20.4 GVEJ025I52
         K12H20C  C2019 05 02.18703 12 40 02.18 +01 08 39.9                VEJ025I52
         K12H20C KC2019 05 02.22451512 39 51.59 +01 07 53.0          20.8 VuEJ025H21
         K12H20C KC2019 05 02.23258612 39 49.44 +01 07 43.2          21.1 VuEJ025H21
         K12H20C KC2019 05 03.01087712 36 26.25 +00 51 59.0          20.5 GVEJ025J95
         K12H20C KC2019 05 03.02739312 36 21.77 +00 51 38.2          20.3 GVEJ025J95
         K12H20C  C2019 05 03.28978 12 35 12.60 +00 46 18.7          20.5 GVEJ025I52
         K12H20C  C2019 05 03.29207 12 35 12.08 +00 46 16.2                VEJ025I52
         K12H20C  C2019 05 03.29436 12 35 11.31 +00 46 13.4          21.0 GVEJ025I52
         K12H20C  C2019 05 03.29665 12 35 10.72 +00 46 10.4          20.8 GVEJ025I52
         K12H20C  C2019 05 04.14237 12 31 26.07 +00 28 05.0          20.4 GVEJ025I52
         K12H20C  C2019 05 04.14453 12 31 25.49 +00 28 02.1          20.6 GVEJ025I52
         K12H20C  C2019 05 04.14669 12 31 24.90 +00 27 59.3          20.4 GVEJ025I52
         K12H20C  C2019 05 04.14885 12 31 24.30 +00 27 56.7          20.7 GVEJ025I52
    
    Observer details:
    033 Karl Schwarzschild Observatory, Tautenburg.  Observers C. Hoegner,
        B. Stecklum.  Measurer B. Stecklum.  1.34-m f/3 Schmidt + CCD.
    G96 Mt. Lemmon Survey.  Observer T. A. Pruyne.  Measurers B. M. Africano,
        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.  1.5-m reflector + 10K CCD.
    H21 Astronomical Research Observatory, Westfield.  Observer R. Holmes.
        Measurers S. Foglia, L. Buzzi, T. Linder, R. Holmes.  0.76-m f/3.0
        astrograph + CCD.
    I52 Steward Observatory, Mt. Lemmon Station.  Observers B. M. Africano,
        G. J. Leonard, H. Groeller.  Measurers B. M. Africano, 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.  1.0-m reflector + CCD.
    J95 Great Shefford.  Observer P. Birtwhistle.  0.41-m f/6.3
        Schmidt-Cassegrain + CCD.
    K88 GINOP-KHK, Piszkesteto.  Observer K. Sarneczky.  1.02-m
        Ritchey-Chretien + CCD.
    L01 Visnjan Observatory, Tican.  Observers K. Korlevic, G. Kervina.  Measurer
        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 two decimals in degrees), reference and Delta-T
    190501 G96 5.55+ 5.17-    190504 I52 4.99+ 5.45-    MPO232626   -5.7 day
    
    Orbital elements:
    2012 HC20                                                Earth MOID = 0.1138 AU
    Epoch 2019 Apr. 27.0 TT = JDT 2458600.5                 MPC
    M 337.87313              (2000.0)            P               Q
    n   0.28084034     Peri.  263.64276     +0.48104575     +0.85615718
    a   2.3093853      Node    37.09585     -0.62843984     +0.48678738
    e   0.6452499      Incl.   18.22679     -0.61127600     +0.17330010
    P   3.51           H   21.5           G   0.15           U   2
    Residuals in seconds of arc
    120424 703  0.0   1.0+    120501 807  0.2+  0.2+    190501 G96  0.5+  0.1-
    120424 703 (0.1+  1.8+)   120501 807  0.0   0.1+    190501 G96  0.4+  0.2+
    120424 703  0.7-  0.3+    120501 807  0.1-  0.1+    190501 G96  0.3-  0.4-
    120424 703  0.2+  1.1+    120502 204  0.1-  0.4+    190501 I52  0.3+  0.0
    120424 703  0.1+  0.7+    120502 204  0.4-  0.0     190501 I52  0.2-  0.3-
    120424 703  0.1-  0.5-    120503 H21  0.4-  0.3-    190501 I52  0.4+  0.1+
    120424 703 (0.1-  1.6-)   120503 H21  0.5+  0.4-    190501 I52  0.5+  0.8+
    120424 703  0.1-  0.7+    120508 H36  1.0+  1.2-    190501 033  0.1-  0.6-
    120425 H21  0.6+  0.4-    120508 H36  0.5+  0.7-    190501 033  0.3-  0.2+
    120425 H21  0.3-  0.2-    120508 H36 (1.9-  0.1+)   190501 033  0.4-  0.0
    120425 H21  0.4-  0.6+    120509 807  0.1-  0.1+    190501 033  0.0   0.0
    120425 703  0.2-  1.1+    120509 807  0.2-  0.0     190501 033  0.2+  0.0
    120425 703  0.6+  0.3+    120509 807  0.4-  0.0     190501 L01  0.2-  0.0
    120425 703  0.9-  0.1+    120509 807  0.0   0.2+    190501 L01  0.2-  0.2-
    120425 703  0.5-  0.3+    120509 807  0.1+  0.1+    190501 L01  0.8-  0.3-
    120426 H36  0.0   0.1-    120509 807  0.0   0.2+    190501 K88  0.3+  0.4+
    120426 H36  0.5+  0.3-    120509 807  0.4+  0.2+    190501 K88  0.4+  0.0
    120426 H36  0.3+  0.7-    120509 807  0.0   0.1-    190502 I52  0.1+  0.2+
    120426 H36  0.1+  0.1+    120509 807  0.0   0.1+    190502 I52  0.0   0.4+
    120426 300  0.7+  0.2-    120509 807  0.0   0.0     190502 I52 (2.0+  0.6+)
    120426 300  0.5+  0.2-    120509 807  0.1-  0.0     190502 H21  1.0+  0.4+
    120426 300  0.2-  0.3+    120509 807  0.3+  0.2-    190502 H21  0.9+  0.1+
    120426 300  0.3+  0.6+    120509 807  0.1-  0.0     190503 J95  0.0   0.3-
    120427 F51  0.1+  0.1-    120517 807  0.3-  0.2+    190503 J95  0.6-  0.7-
    120427 F51  0.2+  0.1-    120517 807  0.2-  0.2+    190503 I52  0.0   0.0
    120427 F51  0.1+  0.1-    120518 807  0.1-  0.2+    190503 I52 (1.6+  0.4+)
    120430 448  0.0   0.1+    120518 807  0.2+  0.2+    190503 I52  0.6-  0.5+
    120430 448  0.4-  0.5-    120523 474  0.5+  0.2+    190503 I52  0.0   0.3+
    120430 448  0.2-  0.4-    120523 474  0.0   0.4+    190504 I52  0.5-  0.2+
    120501 807  0.1-  0.1+    120523 474  0.3+  0.3-    190504 I52  0.2-  0.2+
    120501 807  0.2-  0.1-    120523 474  0.5-  0.1+    190504 I52  0.1-  0.2+
    120501 807  0.0   0.1-    190501 G96  0.5-  0.2+    190504 I52  0.1-  0.4+
    
    Ephemeris:
    2012 HC20                a,e,i = 2.31, 0.65, 18                  q = 0.8193
    Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
    2019 04 04    14 00 05.6 +04 48 35   0.6078  1.5844   159.8    12.6    22.2
    ...
    2019 04 19    13 27 44.6 +03 59 56   0.4504  1.4431   164.5    10.7    21.2
    ...
    2019 04 27    13 01 01.0 +02 36 01   0.3859  1.3668   155.4    17.8    21.0
    ...
    2019 05 03    12 36 29.9 +00 52 33   0.3470  1.3095   145.8    25.7    21.0
    2019 05 04    12 32 04.0 +00 31 26   0.3414  1.2999   144.0    27.1    21.0
    2019 05 05    12 27 32.6 +00 09 08   0.3359  1.2904   142.2    28.6    20.9
    ...
    2019 05 11    11 58 40.8 -02 29 08   0.3077  1.2333   130.9    38.3    20.9
    ...
    2019 05 19    11 16 33.2 -07 00 54   0.2816  1.1584   114.8    52.4    21.0
    ...
    2019 06 03    09 49 55.4 -17 07 59   0.2620  1.0254    85.0    80.2    21.4
    
    A. U. Tomatic                (C) Copyright 2019 MPC           M.P.E.C. 2019-J25
    

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