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  • MPEC 2019-H44 : COMET P/2019 GG21 (PANSTARRS)

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    M.P.E.C. 2019-H44                                Issued 2019 Apr. 23, 01:30 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
    
                             COMET P/2019 GG21 (PANSTARRS)
    
         Initially designated as minor planet 2019 GG21, there was one prior
    report of cometary activity in this object.  R. Weryk and R. Wainscoat (F51,
    Apr. 4) reported a ~1".9 FWHM ("seemingly" larger than the 1".4 +/- 0".2 FWHM
    of nearby stars) and a slight asymmetry to the northwest.  No other credible
    cometary reports were received.  A report received today of a "new comet"
    (remarking that 2019 GG21 was predicted to be "nearby") from S. Sheppard (807,
    Apr. 4 and 5) noted that the object had a 21" tail in P.A. 310.  The object is
    therefore being redesignated P/2019 GG21.
    
    Observations:
        PK19G21G  C2019 03 29.25216 11 57 09.61 -02 59 47.2          19.9 GVEH044G96
        PK19G21G  C2019 03 29.25776 11 57 09.36 -02 59 46.1          20.1 GVEH044G96
        PK19G21G  C2019 03 29.26335 11 57 09.19 -02 59 45.3          19.9 GVEH044G96
        PK19G21G  C2019 03 29.26895 11 57 09.01 -02 59 44.3          20.1 GVEH044G96
        PK19G21G .C2019 04 04.12310 11 54 15.772-02 47 38.14         20.8 rVEH044807
        PK19G21G* C2019 04 04.39692 11 54 07.913-02 47 07.49         21.0 wUEH044F51
        PK19G21G  C2019 04 04.40816 11 54 07.558-02 47 06.17         21.0 wUEH044F51
        PK19G21G  C2019 04 04.41937 11 54 07.228-02 47 04.72         21.0 wUEH044F51
        PK19G21G  C2019 04 04.43059 11 54 06.904-02 47 03.36         21.2 wUEH044F51
        PK19G21G .C2019 04 05.12219 11 53 47.318-02 45 37.98         21.1 rVEH044807
        PK19G21G |C2019 04 05.14267 11 53 46.72 -02 45 35.0          20.2 VuEH044807
        PK19G21G |C2019 04 05.14719 11 53 46.61 -02 45 34.4          20.4 VuEH044807
        PK19G21G |C2019 04 05.15111 11 53 46.51 -02 45 34.0          20.9 VuEH044807
        PK19G21G  C2019 04 05.21337 11 53 44.80 -02 45 28.6          19.8 GVEH044I52
        PK19G21G  C2019 04 05.22070 11 53 44.58 -02 45 27.8          20.4 GVEH044I52
        PK19G21G  C2019 04 05.23910 11 53 44.11 -02 45 26.3          20.0 GVEH044I52
        PK19G21G 1C2019 04 05.47296 11 53 37.48 -02 44 55.5                VEH044Q62
        PK19G21G 1C2019 04 05.47765 11 53 37.35 -02 44 54.6                VEH044Q62
        PK19G21G 1C2019 04 05.48235 11 53 37.20 -02 44 54.2          20.8 GVEH044Q62
        PK19G21G  C2019 04 05.90107 11 53 25.42 -02 44 08.1          21.8 VVEH044033
        PK19G21G  C2019 04 05.90464 11 53 25.34 -02 44 07.7          21.4 VVEH044033
        PK19G21G KC2019 04 06.00991811 53 22.33 -02 43 54.5          21.1 GVEH044L01
        PK19G21G KC2019 04 06.01303711 53 22.27 -02 43 54.0          21.0 GVEH044L01
        PK19G21G KC2019 04 06.01627011 53 22.10 -02 43 53.6          21.0 GVEH044L01
        PK19G21G KC2019 04 06.89368 11 52 57.88 -02 42 10.2          20.3 VqEH044A71
        PK19G21G KC2019 04 06.91173 11 52 57.38 -02 42 08.2          20.3 VqEH044A71
        PK19G21G KC2019 04 06.93243 11 52 56.82 -02 42 05.7          20.9 VqEH044A71
        PK19G21G KC2019 04 06.94447 11 52 56.46 -02 42 04.0          20.5 VqEH044A71
        PK19G21G  C2019 04 07.38816 11 52 44.32 -02 41 11.5          19.8 GVEH044I52
        PK19G21G  C2019 04 07.39624 11 52 44.10 -02 41 10.4          20.3 GVEH044I52
        PK19G21G  C2019 04 07.41033 11 52 43.67 -02 41 08.6          20.9 GVEH044I52
        PK19G21G 9C2019 04 08.94794 11 52 02.60 -02 38 12.6          20.1 GVEH044G40
        PK19G21G 9C2019 04 08.97041 11 52 01.94 -02 38 09.8          20.4 GVEH044G40
        PK19G21G  C2019 04 10.87921 11 51 12.53 -02 34 37.1          19.2 VVEH044033
        PK19G21G  C2019 04 10.88278 11 51 12.40 -02 34 36.5          19.4 VVEH044033
        PK19G21G  C2019 04 10.88635 11 51 12.33 -02 34 35.9          19.4 VVEH044033
        PK19G21G  C2019 04 10.89041 11 51 12.23 -02 34 35.5          19.2 VVEH044033
        PK19G21G  C2019 04 11.19863 11 51 04.44 -02 34 01.4          20.4 GVEH044I52
        PK19G21G  C2019 04 11.20601 11 51 04.26 -02 34 00.3          20.9 GVEH044I52
        PK19G21G  C2019 04 11.22615 11 51 03.73 -02 33 58.8                VEH044I52
        PK19G21G  C2019 04 11.23362 11 51 03.52 -02 33 56.9                VEH044I52
        PK19G21G KC2019 04 12.22815 11 50 38.84 -02 32 10.4                oEH044711
        PK19G21G KC2019 04 12.23186 11 50 38.72 -02 32 09.9                oEH044711
        PK19G21G KC2019 04 12.23555 11 50 38.61 -02 32 09.7                oEH044711
        PK19G21G HC2019 04 13.21897 11 50 14.69 -02 30 26.9          20.9 RoEH044691
        PK19G21G HC2019 04 13.22972 11 50 14.48 -02 30 25.0          20.6 RoEH044691
        PK19G21G HC2019 04 13.24045 11 50 14.14 -02 30 24.3          20.4 RoEH044691
        PK19G21G KC2019 04 14.13719 11 49 53.03 -02 28 52.1                oEH044691
        PK19G21G KC2019 04 14.14810 11 49 52.73 -02 28 50.9                oEH044691
        PK19G21G KC2019 04 14.15901 11 49 52.48 -02 28 50.0                oEH044691
    
    Observer details:
    033 Karl Schwarzschild Observatory, Tautenburg.  Observers F. Ludwig,
        B. Stecklum, C. Hoegner.  Measurer B. Stecklum.  1.34-m f/3 Schmidt + CCD.
    691 Steward Observatory, Kitt Peak-Spacewatch.  Observers A. F. Tubbiolo,
        R. S. McMillan.  0.9-m f/3 reflector + CCD.
    711 McDonald Observatory, Fort Davis.  Observer J. G. Ries.  2.1-m reflector
        + CCD + focal reducer.
    807 Cerro Tololo Observatory, La Serena.  Observers S. S. Sheppard, T. Linder,
        R. Holmes.  Measurers T. Linder, R. Holmes.  4.0-m CTIO reflector + CCD,
        0.61-m f/6.5 astrograph + CCD.
    A71 Stixendorf.  Observers M. Jaeger, E. Prosperi, S. Prosperi, W. Vollmann.
        Measurer M. Jaeger.  0.4-m f/3.2 reflector + CCD.
    F51 Pan-STARRS 1, Haleakala.  Observers J. Bulger, T. Lowe, A. Schultz,
        M. Willman.  Measurers K. Chambers, S. Chastel, T. de Boer, L. Denneau,
        J. Fairlamb, H. Flewelling, M. Huber, C.-C. Lin, E. Magnier,
        Y. Ramanjooloo, R. Wainscoat, R. Weryk.  1.8-m Ritchey-Chretien + 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, R. A. Kowalski, S. M. Larson, G. J. Leonard, T. A. Pruyne,
        R. L. Seaman, F. C. Shelly.  1.5-m reflector + 10K CCD.
    I52 Steward Observatory, Mt. Lemmon Station.  Observers G. J. Leonard,
        H. Groeller, 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, R. L. Seaman,
        F. C. Shelly.  1.0-m reflector + CCD.
    L01 Visnjan Observatory, Tican.  Observers K. Korlevic, F. Valentine.
        Measurer K. Korlevic.  1.0-m f/2.9 reflector + CCD.
    Q62 iTelescope Observatory, Siding Spring.  Observer H. Sato.  0.43-m f/6.8
        astrograph + CCD.
    
    Orbital elements:
        P/2019 GG21 (PANSTARRS)
    Epoch 2019 July 16.0 TT = JDT 2458680.5
    T 2019 July 3.61207 TT                                  MPCW
    q   3.8111998            (2000.0)            P               Q
    n   0.04461907     Peri.  218.46813     -0.94908640     +0.31305678
    a   7.8726763      Node   339.69149     -0.25819763     -0.83685801
    e   0.5158953      Incl.    5.80062     -0.18046880     -0.44907029
    P  22.09
    From 50 observations 2019 Mar. 29-Apr. 14, mean residual 0".4.
    
        P/2019 GG21 (PANSTARRS)
    Epoch 2041 Nov. 17.0 TT = JDT 2466840.5
    T 2041 Nov. 10.46625 TT                                 MPCW
    q   3.8873187            (2000.0)            P               Q
    n   0.04314574     Peri.  219.02672     -0.94753703     +0.31773464
    a   8.0508936      Node   339.41774     -0.26273732     -0.83637450
    e   0.5171569      Incl.    5.69798     -0.18205128     -0.44667929
    P  22.84
    From 50 observations 2019 Mar. 29-Apr. 14, mean residual 0".4.
    
        P/2019 GG21 (PANSTARRS)
    Epoch 2019 Apr. 27.0 TT = JDT 2458600.5
    T 2019 July 3.55659 TT                                  MPCW
    q   3.8112153            (2000.0)            P               Q
    n   0.04462197     Peri.  218.45860     -0.94913595     +0.31290657
    a   7.8723348      Node   339.69195     -0.25806511     -0.83689819
    e   0.5158723      Incl.    5.80069     -0.18039776     -0.44910009
    P  22.09
    From 50 observations 2019 Mar. 29-Apr. 14, mean residual 0".4.
    
    Ephemeris:
        P/2019 GG21 (PANSTARRS)
    Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   m1    m2
    2019 03 24    11 59 51.2 -03 10 37   2.8693  3.8648   176.7     0.9  21.2
    ...
    2019 04 08    11 52 27.9 -02 39 59   2.8880  3.8503   161.4     4.7  21.2
    ...
    2019 04 16    11 49 10.5 -02 25 47   2.9234  3.8434   152.8     6.8  21.2
    ...
    2019 04 22    11 47 10.3 -02 17 13   2.9605  3.8387   146.5     8.3  21.2
    2019 04 23    11 46 52.8 -02 16 00   2.9675  3.8380   145.4     8.5  21.2
    2019 04 24    11 46 36.2 -02 14 51   2.9747  3.8372   144.4     8.8  21.2
    ...
    2019 04 30    11 45 14.0 -02 09 23   3.0226  3.8330   138.2    10.1  21.2
    ...
    2019 05 08    11 44 13.8 -02 06 24   3.0976  3.8280   130.3    11.6  21.3
    ...
    2019 05 23    11 45 02.0 -02 15 37   3.2656  3.8203   116.1    13.8  21.4
    
    Gareth V. Williams           (C) Copyright 2019 MPC           M.P.E.C. 2019-H44
    

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