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  • MPEC 2012-X14 : COMET C/2012 V4

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    M.P.E.C. 2012-X14                                Issued 2012 Dec. 5, 03:28 UT
    
         The Minor Planet Electronic Circulars contain information on unusual
             minor planets and routine data on comets.  They are published
       on behalf of Commission 20 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 http://www.minorplanetcenter.net/    ISSN 1523-6714
    
                                    COMET C/2012 V4
    
    Observations:
        CK12V040 KC2012 12 02.02261 19 14 02.00 -27 14 39.4          12.1 TuEX014I47
        CK12V040 KC2012 12 02.02493 19 14 01.89 -27 14 32.6          12.1 TuEX014I47
        CK12V040 KC2012 12 02.02733 19 14 01.78 -27 14 26.2          12.1 TuEX014I47
        CK12V040 KC2012 12 02.03004 19 14 01.60 -27 14 18.9          12.1 TuEX014I47
        CK12V040 KC2012 12 02.03104 19 14 01.56 -27 14 16.0          12.1 TuEX014I47
        CK12V040 KC2012 12 02.03236 19 14 01.49 -27 14 12.6          12.1 TuEX014I47
        CK12V040 KC2012 12 02.03241 19 14 01.48 -27 14 12.5          12.1 TuEX014I47
        CK12V040 |C2012 12 02.03303 19 14 01.52 -27 14 18.1                cEX014H06
        CK12V040 |C2012 12 02.03393 19 14 01.51 -27 14 15.4                cEX014H06
        CK12V040 KC2012 12 02.03468 19 14 01.40 -27 14 06.2          12.1 TuEX014I47
        CK12V040 |C2012 12 02.03483 19 14 01.42 -27 14 13.4                cEX014H06
        CK12V040 |C2012 12 02.03573 19 14 01.39 -27 14 10.4                cEX014H06
        CK12V040 |C2012 12 02.03664 19 14 01.32 -27 14 08.5                cEX014H06
        CK12V040 KC2012 12 02.03700 19 14 01.26 -27 14 00.4          12.1 TuEX014I47
        CK12V040 |C2012 12 02.03754 19 14 01.29 -27 14 06.0          10.6 TcEX014H06
        CK12V040 KC2012 12 02.03894 19 14 01.17 -27 13 54.5          12.1 TuEX014I47
        CK12V040  C2012 12 03.00684 19 13 11.69 -26 30 47.3                rEX014I10
        CK12V040  C2012 12 03.01298 19 13 11.39 -26 30 31.2                rEX014I10
        CK12V040  C2012 12 03.01957 19 13 11.07 -26 30 13.4                rEX014I10
        CK12V040 |C2012 12 03.03368 19 13 10.45 -26 29 42.5                cEX014H06
        CK12V040 |C2012 12 03.03458 19 13 10.43 -26 29 39.8                cEX014H06
        CK12V040 |C2012 12 03.03548 19 13 10.36 -26 29 37.7                cEX014H06
        CK12V040 |C2012 12 03.03638 19 13 10.29 -26 29 35.5                cEX014H06
        CK12V040 |C2012 12 03.03731 19 13 10.25 -26 29 32.8                cEX014H06
        CK12V040 |C2012 12 03.03821 19 13 10.20 -26 29 30.5          10.5 TcEX014H06
        CK12V040  C2012 12 03.42532 19 12 50.69 -26 12 25.4          14.3 NqEX014E07
        CK12V040  C2012 12 03.42736 19 12 50.56 -26 12 20.0          14.4 NqEX014E07
        CK12V040  C2012 12 03.42969 19 12 50.46 -26 12 13.6          14.1 NqEX014E07
        CK12V040 QC2012 12 03.43067 19 12 50.46 -26 12 11.4          10.7 TqEX014E12
        CK12V040 QC2012 12 03.43207 19 12 50.28 -26 12 07.9          10.7 TqEX014E12
        CK12V040 KC2012 12 03.45081 19 12 49.44 -26 11 18.4          14.1 NqEX014E07
        CK12V040  C2012 12 04.01553 19 12 21.31 -25 46 51.5                rEX014I10
        CK12V040  C2012 12 04.02315 19 12 20.92 -25 46 31.9                rEX014I10
        CK12V040  C2012 12 04.03160 19 12 20.49 -25 46 09.8                rEX014I10
        CK12V040 |C2012 12 04.03469 19 12 20.37 -25 46 08.2                cEX014H06
        CK12V040 |C2012 12 04.03561 19 12 20.31 -25 46 05.6                cEX014H06
        CK12V040 |C2012 12 04.03655 19 12 20.24 -25 46 03.6                cEX014H06
        CK12V040 |C2012 12 04.03745 19 12 20.18 -25 46 00.5                cEX014H06
        CK12V040 |C2012 12 04.03835 19 12 20.17 -25 45 58.0                cEX014H06
        CK12V040 |C2012 12 04.03925 19 12 20.11 -25 45 56.1          10.5 TcEX014H06
        CK12V040 KC2012 12 04.42685 19 12 00.92 -25 29 12.9          15.2 NqEX014E07
        CK12V040 KC2012 12 04.43161 19 12 00.68 -25 29 01.1          14.6 NqEX014E07
        CK12V040 KC2012 12 04.43528 19 12 00.51 -25 28 51.8          14.6 NqEX014E07
        CK12V040  C2012 12 04.79709 19 11 42.65 -25 13 35.3          11.9 NwEX014J24
        CK12V040  C2012 12 04.80095 19 11 42.54 -25 13 26.6          11.9 NwEX014J24
    
    Observer details:
    E07 Murrumbateman.  Observer D. Herald.  0.40-m f/10 Schmidt-Cassegrain + CCD.
    E12 Siding Spring Survey.  Observer R. H. McNaught.  0.5-m Uppsala Schmidt
        + CCD.
    H06 iTelescope Observatory, Mayhill.  Observer H. Sato.  0.51-m f/6.8
        astrograph + CCD + f/4.5 focal reducer.
    I10 Campo Catino Austral Obs., San Pedro de Atacama.  [Observation submission
        malformed: no details found after COD line]
    I47 Pierre Auger Observatory, Malargue.  Observers M. Masek, J. Cerny, J. Ebr,
        M. Prouza, P. Kubanek, M. Jelinek.  Measurer M. Masek.  0.3-m f/10
        reflector + CCD.
    J24 Observatorio Altamira.  Observer J. F. Hernandez.  0.4-m f/10
        Schmidt-Cassegrain + CCD.
    
    Orbital elements:
        C/2012 V4
    Epoch 2012 Dec. 19.0 TT = JDT 2456280.5
    T 2012 Dec. 19.66989 TT                                 MPC
    q   0.8103876            (2000.0)            P               Q
    n   0.00524012     Peri.   20.17837     +0.56428199     -0.69891373
    a  32.8278245      Node   320.41987     -0.81995865     -0.53647100
    e   0.9753140      Incl.  136.39480     -0.09619594     +0.47298887
    P 188
    From 113 observations 1827 July 1-2012 Dec. 4.
    
        C/2012 V4
    Epoch 2012 Sept. 30.0 TT = JDT 2456200.5
    T 2012 Dec. 19.67008 TT                                 MPC
    q   0.8103960            (2000.0)            P               Q
    n   0.00524424     Peri.   20.17758     +0.56428533     -0.69890899
    a  32.8106221      Node   320.41943     -0.81995531     -0.53647778
    e   0.9753008      Incl.  136.39490     -0.09620475     +0.47298818
    P 188
    From 113 observations 1827 July 1-2012 Dec. 4.
    
        The above orbital elements, like those on MPEC X02, assume that
    C/2012 V4 is a return of D/1827 M1 (Pons-Gambart).  Whereas that earlier
    orbit assumed that there were two missed returns between 1827 and 2012,
    the above orbit assumes no missed returns.  The much longer period
    was suggested by the current observations not being well fit to
    orbital periods of ~62 and ~94 years.  Noting the obvious discordance
    between the two E27 observations on Nov. 29, the semimajor axis fit by
    the 2012 observations alone is at least 26 AU, discounting the two-
    and three-missed revolution solutions.  At the present time, the solution
    presented here is believed to be correct, as the fit of the bulk of the
    1827 observations (known to be grossly inaccurate by modern standards) is
    far better than earlier attempts with shorter orbital periods.  There is
    a slight systematic trend in the current residuals, which may be related to
    observation weighting.  Continued observation is clearly desirable.
    
      Presented below is an 1827-epoch orbit and residual block.
    
        C/2012 V4
    Epoch 1827 June 13.0 TT = JDT 2388520.5
    T 1827 June 8.04234 TT                                  MPC
    q   0.8081891            (2000.0)            P               Q
    n   0.00523011     Peri.   20.04000     +0.56413572     -0.69834011
    a  32.8696975      Node   320.28962     -0.81985527     -0.53703795
    e   0.9754123      Incl.  136.40828     -0.09791949     +0.47319270
    P 188
    From 113 observations 1827 July 1-2012 Dec. 4.
    
    Residuals in seconds of arc (or two decimals in units of degrees)
    I276L  030(0.09+ 0.03-)   K12BU  E12  0.8+  1.6-    K12C2  H06  0.1-  0.4+
    I276M  030(0.03+ 0.07-)   K12BU  E12  0.4+  0.8-    K12C2  I47  0.5-  0.1-
    I276N  030(0.04+ 0.07-)   K12BU  E12  0.3+  0.8-    K12C2  I47  0.0   0.1+
    I276T  030(98.5- 93.3+)   K12BU  E12  0.7+  1.1-    K12C2  H06  0.7-  0.1-
    I2771  030 38.9- 98.5+    K12BU  I39  0.4+  1.3-    K12C2  H06  0.5-  0.5+
    I2772  030  5.2+ 93.2+    K12BU  I39  0.0   0.7-    K12C2  I47  0.4-  0.3-
    I2773  030 79.5- 57.9+    K12C1  H47  0.1+  0.8-    K12C2  H06  0.7-  0.1-
    I2774  030 60.0- 75.2+    K12C1  H47  0.2+  0.1-    K12C2  I47  0.3-  0.4-
    I2775  030 35.5- 66.0+    K12C1  H47  0.5+  0.8-    K12C2  H06  0.5-  0.0
    I2776  282 90.3- 82.1+    K12C1  H47  0.5+  0.6-    K12C2  I47  0.1-  0.2+
    I2776  030 26.0- 72.6+    K12C1  I39  0.4+  0.8-    K12C3  I10  0.8-  1.0+
    I2776  030 44.8- 25.8+    K12C1  I39  0.2+  0.7-    K12C3  I10  0.7-  0.8+
    I277C  030 25.2- 20.3+    K12C1  D88  1.2+  0.2-    K12C3  I10  0.5-  1.1+
    I277D  030 24.5- 22.8+    K12C1  D88  0.9+  0.2+    K12C3  H06  0.8-  0.8+
    I277D  030 24.2- 20.6+    K12C1  E27  2.6+  1.2+    K12C3  H06  0.5-  1.1+
    I277D  030 21.4- 20.1+    K12C1  E27  1.0+  0.3-    K12C3  H06  0.8-  0.8+
    I277E  030 25.3- 17.4+    K12C1  I39  0.0   0.2-    K12C3  H06  1.1-  0.7+
    I277F  030  2.1+ 46.3+    K12C1  844  0.3-  0.1+    K12C3  H06  1.0-  0.9+
    I277G  030  1.5+ 14.0+    K12C1  844  0.3-  0.3-    K12C3  H06  1.0-  0.8+
    I277G  030 10.7+ 24.1+    K12C1  I39  0.4-  0.1-    K12C3  E07  0.5-  0.8+
    I277H  030  5.5+  2.5-    K12C1  H47  0.4+  0.7-    K12C3  E07  0.9-  0.8+
    I277H  030 18.4-  4.1+    K12C1  844  0.1-  0.2-    K12C3  E07  0.7-  1.1+
    I277I  030 28.0- 20.6+    K12C1  H47  0.2-  0.4-    K12C3  E12  0.2+  1.0+
    I277I  030 28.5- 18.6+    K12C2  H47  0.4-  0.4-    K12C3  E12  1.3-  0.8+
    I277J  030 13.7+ 22.6-    K12C2  H47  0.0   0.1-    K12C3  E07  0.2-  0.7+
    I277J  030 41.8- 34.4-    K12C2  H47  0.3-  0.3+    K12C4  I10  0.7+  1.4+
    I277J  030(0.00+ 0.03+)   K12C2  H47  0.6-  0.2+    K12C4  I10  0.5+  1.2+
    I277K  030 11.2-  9.6+    K12C2  I39  0.1-  0.1-    K12C4  I10  0.4+  1.3+
    I277K  030  0.3+ 12.1+    K12C2  I47  0.4-  0.3-    K12C4  H06  0.7-  1.2+
    I277L  030  5.9-  6.0-    K12C2  I47  0.7+  0.6-    K12C4  H06  0.9-  1.4+
    I277L  030  6.5-  8.5-    K12C2  I47  0.2-  0.2+    K12C4  H06  1.2-  1.0+
    K12BT  E27 (2.6+  4.0-)   K12C2  I47  0.3-  0.2+    K12C4  H06  1.4-  1.8+
    K12BT  E27  1.5+  0.5-    K12C2  I47  0.0   0.1+    K12C4  H06  0.9-  1.9+
    K12BU  E27  1.6+  0.9-    K12C2  I47  0.6-  0.0     K12C4  H06  1.1-  1.5+
    K12BU  E27  1.6+  1.2-    K12C2  I47  0.6-  0.2-    K12C4  E07  0.8-  1.5+
    K12BU  E27  1.9+  0.3-    K12C2  I47  0.4-  0.2+    K12C4  E07  0.8-  1.1+
    K12BU  E27  1.3+  1.0-    K12C2  I47  0.7-  0.1-    K12C4  E07  0.7-  1.0+
    K12BU  E27  1.7+  0.6-    K12C2  I47  0.4-  0.0     K12C4  J24  2.5-  2.6+
    K12BU  E27  1.8+  1.2-    K12C2  I47  0.5-  0.0     K12C4  J24  1.4-  1.5+
    K12BU  E12  0.8+  1.3-    K12C2  H06  0.6-  0.1+
    
    Ephemeris:
        C/2012 V4                                            Elements MPC xxxxx
    Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   m1    m2
    2012 11 05    20 06 29.8 -57 41 51   0.9573  1.1479    72.2    55.3  12.0
    ...
    2012 11 20    19 26 42.6 -37 52 45   1.2150  0.9794    51.5    52.2  11.8
    ...
    2012 11 28    19 17 40.6 -30 25 30   1.3657  0.9059    41.5    46.2  11.7
    ...
    2012 12 04    19 12 22.5 -25 47 37   1.4724  0.8622    34.4    40.2  11.7
    2012 12 05    19 11 33.3 -25 05 02   1.4893  0.8560    33.2    39.1  11.7
    2012 12 06    19 10 44.9 -24 23 24   1.5058  0.8502    32.0    37.9  11.7
    ...
    2012 12 12    19 06 06.0 -20 30 52   1.5968  0.8232    25.4    30.8  11.7
    ...
    2012 12 20    19 00 12.2 -15 56 58   1.6923  0.8104    17.5    21.5  11.7
    ...
    2013 01 04    18 49 43.8 -08 29 58   1.7766  0.8599    14.4    16.5  12.1
    
    Gareth V. Williams           (C) Copyright 2012 MPC           M.P.E.C. 2012-X14
    

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