MPEC 2007-J55 : COMET C/2007 JA21 (LINEAR)

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M.P.E.C. 2007-J55                                Issued 2007 May 14, 02:01 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.cfa.harvard.edu/iau/mpc.html  ISSN 1523-6714

                          COMET C/2007 JA21 (LINEAR)

Observations:
    CK07J21A  C2007 05 12.82000 17 38 19.75 +53 06 16.8          21.1 T EJ055D35
    CK07J21A  C2007 05 12.82103 17 38 19.62 +53 06 15.5          19.4 T EJ055D35
    CK07J21A  C2007 05 12.82207 17 38 19.63 +53 06 16.2          19.6 T EJ055D35
    CK07J21A  C2007 05 13.34969 17 37 38.90 +53 06 06.7          20.3 N EJ055704
    CK07J21A  C2007 05 13.35915 17 37 38.37 +53 06 07.4          19.8 N EJ055704
    CK07J21A  C2007 05 13.36877 17 37 37.56 +53 06 07.6          19.8 N EJ055704
    CK07J21A  C2007 05 13.37823 17 37 36.90 +53 06 07.5          19.9 N EJ055704
    CK07J21A  C2007 05 13.38279 17 37 36.41 +53 06 06.9                 EJ055711
    CK07J21A  C2007 05 13.39559 17 37 35.59 +53 06 07.3                 EJ055711
    CK07J21A  C2007 05 13.40836 17 37 34.43 +53 06 06.4                 EJ055711
    CK07J21A  C2007 05 13.91641 17 36 55.25 +53 05 54.1          18.7 N EJ055473
    CK07J21A  C2007 05 13.93877 17 36 53.46 +53 05 53.6          18.7 N EJ055473
    CK07J21A  C2007 05 13.96401 17 36 51.51 +53 05 53.3          18.8 N EJ055473

Observer details:
473 Remanzacco.  Observers L. Donato, M. Gonano, V. Gonano, E. Guido,
    G. Sostero.  0.45-m f/4.4 Newtonian reflector + CCD.
704 Lincoln Laboratory ETS, New Mexico.  Observers M. Bezpalko, D. Torres,
    R. Kracke, G. Spitz, J. Kistler.  Measurers J. Stuart, S. Scruggs.  1.0-m
    f/2.15 reflector + CCD.
711 McDonald Observatory.  Observer J. G. Ries.  0.76-m reflector + CCD.
D35 Lulin Observatory.  Observers Q.-z. Ye, H.-C. Lin, C.-S. Lin, C.-y. Shih.
    Measurer Q.-z. Ye.  0.41-m f/8.8 Ritchey-Chretien + CCD.

Orbital elements:
    C/2007 JA21 (LINEAR)
T 2007 May 11.272 TT                                    MPC
q   5.45549              (2000.0)            P               Q
                   Peri.  113.384       -0.167436       -0.365971
                   Node    66.274       -0.695336       -0.614426
e   1.0            Incl.   89.472       +0.698908       -0.698961
From 29 observations 2007 May 11-13.

Ephemeris:
    C/2007 JA21 (LINEAR)
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   m1    m2
2007 05 10    17 41.89   +53 06.1    5.158    5.456   101.8    10.4  18.9
2007 05 20    17 28.83   +52 59.2    5.125    5.456   103.8    10.4  18.9
2007 05 30    17 14.96   +52 29.4    5.105    5.457   105.1    10.3  18.9
2007 06 09    17 01.04   +51 35.2    5.099    5.460   105.5    10.3  18.9
2007 06 19    16 47.83   +50 16.7    5.109    5.463   105.1    10.3  18.9
2007 06 29    16 35.97   +48 35.8    5.135    5.467   103.8    10.4  18.9

Brian G. Marsden             (C) Copyright 2007 MPC           M.P.E.C. 2007-J55

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