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  • MPEC 2023-H237 : COMET C/2020 H11 (PANSTARRS-Lemmon)

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    M.P.E.C. 2023-H237                               Issued 2023 April 28, 22:30 UT
    
         The Minor Planet Electronic Circulars contain information on unusual
             minor planets, routine data on comets and natural satellites,
             and occasional editorial announcements.  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 C/2020 H11 (PANSTARRS-Lemmon)                   
    
        D. Rankin, D. Bamberger and B. Gray found a linkage of 5 isolated tracklets
    spanning Apr. 21 - May 20, 2020 UT, showing a near-parabolic orbit and report
    a very condensed 5" coma and a straight 11" tail at position angle observed
    by Mt. Lemmon Survey (G96) on May 15, 2020. After posting the object on PCCP,
    prediscovery positions were found back to Jun. 2019 UT. Additional reports of
    cometary features are as follows:
    
    OC   Date        Reporter           Coma    Tail    PA          Exposures
    
    F51  2020-04-21  R. Weryk           0".4                          4x45s
    F51  2020-04-27  R. Weryk           0".4                          4x45s
    F51  2020-05-17  R. Weryk           0".4                          4x45s
    
    Observations:
        CK20H110  C2019 06 02.47288716 26 16.569+06 58 14.95         22.07GVEH237F51
        CK20H110  C2019 06 02.48405316 26 16.064+06 58 16.84         21.78GVEH237F51
        CK20H110  C2019 06 07.47632616 22 25.937+07 10 21.73         22.12GVEH237F51
        CK20H110  C2019 06 07.48828116 22 25.402+07 10 23.23         21.75GVEH237F51
        CK20H110  C2019 06 07.51208416 22 24.306+07 10 26.59         22.40GVEH237F51
        CK20H110  C2019 06 09.44388 16 20 55.836+07 14 37.70         22.6 wUEH237F51
        CK20H110  C2019 06 09.45655 16 20 55.261+07 14 39.14         22.3 wUEH237F51
        CK20H110  C2019 06 09.46925 16 20 54.672+07 14 40.74         22.4 wUEH237F51
        CK20H110  C2019 06 09.48189 16 20 54.090+07 14 42.20         22.4 wUEH237F51
        CK20H110  C2019 06 10.48449716 20 08.337+07 16 45.96         22.08GVEH237F51
        CK20H110  C2019 06 10.49813916 20 07.721+07 16 47.33         21.84GVEH237F51
        CK20H110  C2019 06 10.52542216 20 06.475+07 16 50.68         22.63GVEH237F51
        CK20H110  C2019 06 29.41649516 06 26.534+07 41 41.96         21.99GVEH237F52
        CK20H110  C2019 06 29.44975916 06 25.162+07 41 43.72         22.00GVEH237F51
        CK20H110  C2019 07 24.30989315 51 56.737+07 37 17.25         21.79GVEH237F51
        CK20H110  C2019 07 24.31703215 51 56.520+07 37 16.81         23.47GVEH237F51
        CK20H110  C2019 07 24.32416815 51 56.342+07 37 16.81         23.42GVEH237F51
        CK20H110  C2020 03 23.48593415 44 46.514+11 52 42.10         22.05GVEH237F52
        CK20H110  C2020 03 23.49762115 44 46.109+11 52 46.25         22.25GVEH237F52
        CK20H110  C2020 04 19.55566815 26 01.065+14 32 50.38         21.51GVEH237F52
        CK20H110  C2020 04 19.56680815 26 00.555+14 32 53.89         21.50GVEH237F52
        CK20H110* C2020 04 21.57079 15 24 23.963+14 43 26.63         22.1 wUEH237F51
        CK20H110  C2020 04 21.58175 15 24 23.447+14 43 29.98         22.3 wUEH237F51
        CK20H110  C2020 04 21.59266 15 24 22.899+14 43 33.44         22.1 wUEH237F51
        CK20H110  C2020 04 21.60355 15 24 22.371+14 43 37.24         22.2 wUEH237F51
        CK20H110  C2020 04 27.52191 15 19 30.136+15 13 06.97         21.8 wUEH237F51
        CK20H110  C2020 04 27.53373 15 19 29.529+15 13 10.09         22.0 wUEH237F51
        CK20H110  C2020 04 27.55735 15 19 28.346+15 13 16.72         21.8 wUEH237F51
        CK20H110  C2020 05 15.31358 15 04 19.59 +16 23 53.4          21.2 GVEH237G96
        CK20H110  C2020 05 15.31833 15 04 19.32 +16 23 55.2          21.1 GVEH237G96
        CK20H110  C2020 05 15.32307 15 04 19.04 +16 23 56.3          21.5 GVEH237G96
        CK20H110  C2020 05 15.32783 15 04 18.87 +16 23 56.7          21.7 GVEH237G96
        CK20H110  C2020 05 17.32992 15 02 36.311+16 30 02.10         21.9 wUEH237F51
        CK20H110  C2020 05 17.35328 15 02 35.104+16 30 06.24         21.7 wUEH237F51
        CK20H110  C2020 05 17.36484 15 02 34.481+16 30 08.58         22.0 wUEH237F51
        CK20H110  C2020 05 20.31243 15 00 04.43 +16 38 19.8          21.6 GVEH237G96
        CK20H110  C2020 05 20.31707 15 00 04.22 +16 38 20.3          21.5 GVEH237G96
        CK20H110  C2020 05 20.32170 15 00 03.98 +16 38 22.3          21.4 GVEH237G96
        CK20H110  C2020 05 20.32634 15 00 03.69 +16 38 22.1          21.2 GVEH237G96
        CK20H110  C2020 05 23.45791514 57 25.954+16 46 06.55         22.03GVEH237F51
        CK20H110  C2020 05 23.47008414 57 25.353+16 46 07.96         21.41GVEH237F51
        CK20H110  C2020 05 23.48223814 57 24.759+16 46 09.28         20.96GVEH237F51
        CK20H110  C2020 05 23.49446414 57 24.100+16 46 10.91         22.29GVEH237F51
        CK20H110  C2021 03 18.37852314 05 32.78 +20 47 43.1          21.70GVEH237G96
        CK20H110  C2021 03 18.38369314 05 32.52 +20 47 45.1          21.70GVEH237G96
        CK20H110  C2021 03 18.38886714 05 32.31 +20 47 46.6          21.52GVEH237G96
        CK20H110  C2021 03 18.39405414 05 32.09 +20 47 48.6          22.26GVEH237G96
        CK20H110  C2021 04 08.50835213 48 06.829+22 42 51.16         21.75GVEH237F51
        CK20H110  C2021 04 08.53100213 48 05.620+22 42 57.50         21.12GVEH237F51
        CK20H110  C2021 04 08.54238213 48 05.028+22 43 00.66         21.42GVEH237F51
        CK20H110 KC2021 04 16.35971513 41 12.919+23 16 10.06         21.94GVEH237F52
        CK20H110  C2021 04 30.28091513 29 05.205+23 59 18.29         21.56GVEH237F51
        CK20H110  C2021 05 08.49230613 22 15.658+24 14 45.81         22.07GVEH237F51
    
    Observer details:
    F51 Pan-STARRS 1, Haleakala.  Observers J. Bulger, K. Chambers, T. Lowe, A.
        Schultz, I. Smith, M. Willman.  Measurers S. Chastel, J. Fairlamb, M.
        Huber, Y. Ramanjooloo, R. Wainscoat, R. Weryk, K. Chambers, T. de Boer, L.
        Denneau, H. Flewelling, C.-C. Lin, E. Magnier.  1.8-m Ritchey-Chretien +
        CCD.
    F52 Pan-STARRS 2, Haleakala.  Observers J. Bulger, K. Chambers, T. Dukes, T.
        Lowe, A. Schultz, I. Smith.  Measurers S. Chastel, J. Fairlamb, M. Huber,
        Y. Ramanjooloo, R. Wainscoat, R. Weryk.  1.8-m Ritchey-Chretien + CCD.
    G96 Mt. Lemmon Survey.  Observers G. J. Leonard, H. Groeller, D. Rankin.
        Measurers 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, D. Rankin, R. L. Seaman, F. C. Shelly, K. W. Wierzchos.  1.5-m
        reflector + 10K CCD.
    
    Orbital elements:
        C/2020 H11 (PANSTARRS-Lemmon)                                               
    Epoch 2023 Feb. 25.0 TT = JDT 2460000.5                                         
    T 2020 Sept. 15.35384 TT                                Rudenko                 
    q   7.6283636            (2000.0)            P               Q                  
    z  -0.0003090      Peri.   91.48268     -0.74997413     -0.52584991             
     +/-0.0000081      Node   303.03008     -0.60937060     +0.78523298             
    e   1.0023570      Incl.  151.40421     +0.25730581     +0.32694195             
    From 53 observations 2019 June 2-2021 May 8, mean residual 0".3.                
                                                                                    
    Ephemeris:
    Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase   m1    m2
    2023 03 29    10 43 40.9 +27 23 06   8.7005  9.4916   140.5     3.8  23.0
    ...
    2023 04 13    10 35 01.0 +27 30 03   8.9272  9.5443   125.5     4.9  23.1
    ...
    2023 04 21    10 31 04.0 +27 28 03   9.0681  9.5726   117.4     5.3  23.1
    ...
    2023 04 27    10 28 26.9 +27 24 11   9.1806  9.5940   111.4     5.6  23.1
    2023 04 28    10 28 02.5 +27 23 22   9.1999  9.5975   110.4     5.6  23.1
    2023 04 29    10 27 38.6 +27 22 29   9.2192  9.6011   109.4     5.7  23.1
    ...
    2023 05 05    10 25 26.0 +27 16 14   9.3376  9.6225   103.5     5.8  23.2
    ...
    2023 05 13    10 22 57.9 +27 05 28   9.4998  9.6512    95.6     6.0  23.2
    ...
    2023 05 28    10 19 46.8 +26 39 06   9.8084  9.7052    81.2     5.9  23.3
    
    M. P. C. Staff               (C) Copyright 2023 MPC           M.P.E.C. 2023-H237
    


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