[Iaude] MPEC X23: COMET C/2018 W2 (Africano)

mpec at mpcdb1.cfa.harvard.edu mpec at mpcdb1.cfa.harvard.edu
Sun Dec 2 23:13:16 EST 2018


M.P.E.C. 2018-X23                                Issued 2018 Dec. 3, 03:52 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 at CFA.HARVARD.EDU
            URL https://www.minorplanetcenter.net/    ISSN 1523-6714


                          COMET C/2018 W2 (Africano)

     This object was reported as a comet by B. Africano (G96), who described a
compact 5"-8" core with a potential tail extending several arcsecond in P.A.
255-260.  A later report received from H. Groeller (703) described a 5"-7"
compact coma and apparent tail in P.A. 230-300.  D. T. Durig (850, Nov. 28)
reported a 10" tail in P.A. 260 in poor conditions.  K. Korlevic (L01, Nov. 29)
reported a 11" coma and a 9" tail in P.A. 270.

Observations:
    CK18W020  C2018 11 27.51078 12 59 43.44 +44 16 32.9          18.2 GVEX023703
    CK18W020  C2018 11 27.51494 12 59 43.65 +44 16 36.8          18.4 GVEX023703
    CK18W020  C2018 11 27.51911 12 59 44.01 +44 16 39.1          18.3 GVEX023703
    CK18W020  C2018 11 27.52327 12 59 44.24 +44 16 42.9          18.2 GVEX023703
    CK18W020* C2018 11 27.53001 12 59 44.75 +44 16 47.1          18.3 GVEX023G96
    CK18W020  C2018 11 27.53596 12 59 45.13 +44 16 51.3          18.3 GVEX023G96
    CK18W020  C2018 11 27.53893 12 59 45.30 +44 16 53.0          18.4 GVEX023G96
    CK18W020 KC2018 11 28.15609 13 00 26.45 +44 24 09.0                vEX023L06
    CK18W020 KC2018 11 28.16822 13 00 27.26 +44 24 18.7                vEX023L06
    CK18W020  C2018 11 28.18144 13 00 28.24 +44 24 28.3          18.5 RvEX023L06
    CK18W020 KC2018 11 28.38859 13 00 41.94 +44 26 56.4          18.3 RuEX023850
    CK18W020 KC2018 11 28.40276 13 00 42.97 +44 27 07.7          18.4 RuEX023850
    CK18W020 KC2018 11 28.41693 13 00 43.93 +44 27 17.0          17.9 RuEX023850
    CK18W020 KC2018 11 28.43111 13 00 44.89 +44 27 27.8          18.0 RuEX023850
    CK18W020 KC2018 11 28.44526 13 00 45.82 +44 27 38.5          18.7 RuEX023850
    CK18W020  C2018 11 28.80440 13 01 09.82 +44 31 57.5          18.0 RoEX023P93
    CK18W020  C2018 11 28.80763 13 01 09.99 +44 31 59.4          17.9 RoEX023P93
    CK18W020  C2018 11 28.80924 13 01 10.09 +44 32 00.8          18.1 RoEX023P93
    CK18W020 KC2018 11 29.08031513 01 28.29 +44 35 17.3          19.3 GVEX023L01
    CK18W020 KC2018 11 29.08577013 01 28.58 +44 35 21.0          19.2 GVEX023L01
    CK18W020 KC2018 11 29.08771813 01 28.77 +44 35 23.0          19.1 GVEX023L01
    CK18W020 KC2018 11 29.09315513 01 29.08 +44 35 27.0          19.2 GVEX023L01
    CK18W020 9C2018 11 29.21387 13 01 37.12 +44 36 55.7                UEX023G40
    CK18W020 9C2018 11 29.22059 13 01 37.63 +44 37 00.0          17.9 RUEX023G40
    CK18W020 9C2018 11 29.22752 13 01 38.11 +44 37 06.0                UEX023G40
    CK18W020  C2018 11 29.81443 13 02 17.50 +44 44 19.3          19.1 RrEX023P93
    CK18W020  C2018 11 29.81721 13 02 17.68 +44 44 21.1          18.9 RrEX023P93
    CK18W020  C2018 11 29.81996 13 02 17.88 +44 44 23.5          18.9 RrEX023P93
    CK18W020  C2018 11 29.82272 13 02 18.13 +44 44 25.0          18.8 RrEX023P93
    CK18W020 KC2018 12 02.04796 13 04 47.61 +45 12 39.4          18.2  qEX023157
    CK18W020 KC2018 12 02.05982 13 04 48.48 +45 12 48.6          18.3  qEX023157
 
Observer details:
157 Frasso Sabino.  Observers R. Haver, R. Gorelli.  Measurer R. Haver.
    0.37-m f/6.70 Cassegrain + CCD.
703 Catalina Sky Survey.  Observer H. Groeller.  Measurers B. M. Africano,
    E. J. Christensen, G. A. Farneth, D. C. Fuls, A. R. Gibbs, A. D. Grauer,
    H. Groeller, J. A. Johnson, R. A. Kowalski, S. M. Larson, G. J. Leonard,
    R. L. Seaman, F. C. Shelly.  0.68-m Schmidt + 10K CCD.
850 Cordell-Lorenz Observatory, Sewanee.  Observers D. T. Durig, A. Ortiz,
    J. R. Hofstetter, C. B. Smith.  0.3-m f/7.6 Schmidt-Cassegrain +
    1536x1024 CCD.
G40 Slooh.com Canary Islands Observatory.  Observer B. Lutkenhoner.  0.5-m
    f/6.8 Corrected Dall-Kirkham + CCD.
G96 Mt. Lemmon Survey.  Observer B. M. Africano.  Measurers B. M. Africano,
    E. J. Christensen, G. A. Farneth, D. C. Fuls, A. R. Gibbs, A. D. Grauer,
    H. Groeller, J. A. Johnson, R. A. Kowalski, S. M. Larson, G. J. Leonard,
    R. L. Seaman, F. C. Shelly.  1.5-m reflector + 10K CCD.
L01 Visnjan Observatory, Tican.  Observers K. Korlevic, F. Valentine.
    Measurer K. Korlevic.  1.0-m f/2.9 reflector + CCD.
L06 Sormano 2 Observatory, Bellagio Via Lattea.  Observer G. Ventre.
    Measurers G. Ventre, P. Sicoli.  0.28-m f/10 reflector + CCD.
P93 Space Tracking and Communications Center, JAXA.  Observers S. Urakawa,
    A. Asami.  1.0-m f/3.0 reflector + CCD.
 
Orbital elements:
    C/2018 W2 (Africano)
T 2019 Sept. 15.62887 TT                                MPCW
q   1.5906658            (2000.0)            P               Q
                   Peri.  153.66955     +0.89642032     +0.44320418
                   Node   179.94831     +0.01220278     -0.02652351
e   1.0            Incl.  115.11167     +0.44303692     -0.89602821
>From 31 observations 2018 Nov. 27-Dec. 2.

Ephemeris:
    C/2018 W2 (Africano)
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   m1    m2
2018 11 03    12 33 25.9 +40 42 05   4.4774  4.1054    62.0    12.3  18.9
...
2018 11 18    12 49 18.0 +42 36 40   4.1532  3.9640    72.2    13.7  18.6
...
2018 11 26    12 58 02.8 +43 59 07   3.9767  3.8882    77.7    14.4  18.4
...
2018 12 02    13 04 44.2 +45 12 02   3.8444  3.8312    81.9    14.8  18.3
2018 12 03    13 05 51.8 +45 25 10   3.8225  3.8217    82.5    14.8  18.2
2018 12 04    13 06 59.5 +45 38 36   3.8006  3.8122    83.2    14.9  18.2
...
2018 12 10    13 13 49.5 +47 05 28   3.6704  3.7551    87.3    15.2  18.1
...
2018 12 18    13 23 06.0 +49 18 51   3.5017  3.6787    92.5    15.5  17.9
...
2019 01 02    13 41 03.1 +54 26 26   3.2096  3.5350   101.2    15.8  17.5

Gareth V. Williams           (C) Copyright 2018 MPC           M.P.E.C. 2018-X23



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