MPEC 2011-P19 : COMET P/2011 P1 (MCNAUGHT)

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M.P.E.C. 2011-P19                                Issued 2011 Aug. 4, 23:14 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 P/2011 P1 (MCNAUGHT)

Observations:
    PK11P010 QC2011 08 01.77495 02 30 48.48 +17 06 47.2          18.6 TrEP019E12
    PK11P010 |C2011 08 02.44270 02 31 02.38 +17 08 32.7                cEP019H06
    PK11P010 |C2011 08 02.44459 02 31 02.41 +17 08 33.3                cEP019H06
    PK11P010 |C2011 08 02.44649 02 31 02.41 +17 08 34.0          17.8 TcEP019H06
    PK11P010 QC2011 08 02.71310 02 31 07.97 +17 09 17.8          18.9 TrEP019E12
    PK11P010 KC2011 08 03.08900 02 31 15.59 +17 10 16.3          20.0 TvEP019470
    PK11P010 KC2011 08 03.09631 02 31 15.77 +17 10 16.0                vEP019470
    PK11P010 QC2011 08 03.74869 02 31 28.76 +17 12 00.9          18.5 TrEP019E12
    PK11P010 QC2011 08 03.80948 02 31 29.92 +17 12 10.4          18.6 TrEP019E12
    PK11P010 KC2011 08 04.36303702 31 40.59 +17 13 32.4          18.9 TrEP019H21
    PK11P010 KC2011 08 04.38137902 31 40.90 +17 13 36.6          18.6 TrEP019H21
    PK11P010 KC2011 08 04.39360702 31 41.17 +17 13 37.8          18.9 TrEP019H21

Observer details:
470 Ceccano.  Observers G. Masi, U. Masi, G. Luccone.  Measurers G. Masi,
    G. Luccone.  0.43-m f/6.8 reflector + CCD.
E12 Siding Spring Survey.  Observer R. H. McNaught.  Measurers J. D. Ahern,
    E. C. Beshore, A. Boattini, G. J. Garradd, A. R. Gibbs, A. D. Grauer,
    R. E. Hill, R. A. Kowalski, S. M. Larson, R. H. McNaught.  0.5-m Uppsala
    Schmidt + CCD.
H06 RAS Observatory, Mayhill.  Observer H. Sato.  0.51-m f/4.5 reflector + CCD.
H21 Astronomical Research Observatory, Westfield.  Observer R. Holmes.
    Measurers S. Foglia, T. Vorobjov.  0.61-m f/4.0 astrograph + CCD.

Orbital elements:
    P/2011 P1 (McNaught)
T 2009 Mar. 24.83844 TT                                 MPC
q   2.3463744            (2000.0)            P               Q
n   0.15598206     Peri.  228.84072     -0.59853277     +0.80106522
a   3.4178497      Node     4.41299     -0.70373501     -0.52142332
e   0.3134940      Incl.    5.43100     -0.38277351     -0.29395959
P   6.32
From 12 observations 2011 Aug. 1-4.  Very uncertain elements, continuing
   observation very desirable.

Ephemeris:
    P/2011 P1 (McNaught)
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   m1    m2
2011 07 05    02 16 35.6 +15 31 03   4.5714  4.2505    65.4    12.6  18.6
...
2011 07 20    02 25 18.0 +16 27 38   4.3762  4.2721    77.4    13.4  18.5
...
2011 07 28    02 28 58.6 +16 53 10   4.2665  4.2832    84.1    13.6  18.5
...
2011 08 03    02 31 13.7 +17 10 02   4.1829  4.2913    89.2    13.7  18.4
2011 08 04    02 31 33.5 +17 12 38   4.1689  4.2926    90.1    13.7  18.4
2011 08 05    02 31 52.5 +17 15 11   4.1549  4.2940    91.0    13.7  18.4
...
2011 08 11    02 33 29.6 +17 29 15   4.0711  4.3019    96.3    13.5  18.4
...
2011 08 19    02 34 51.3 +17 44 32   3.9608  4.3122   103.6    13.2  18.3
...
2011 09 03    02 34 45.8 +18 01 36   3.7649  4.3307   118.0    11.9  18.2

Gareth V. Williams           (C) Copyright 2011 MPC           M.P.E.C. 2011-P19

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