[Iaude] MPEC J72: COMET C/2021 G1 (Leonard)

mpec at marsden.cfa.harvard.edu mpec at marsden.cfa.harvard.edu
Thu May 6 02:26:17 EDT 2021


M.P.E.C. 2021-J72                                   Issued 2021 May 6, 06:23 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/2021 G1 (Leonard)                            

    G. J. Leonard reports the discovery of a comet in four co-added 30 second
survey images taken by Mt. Lemmon Survey (G96) on Apr. 11 UT.  He reports a 
moderately condensed 10" coma.  D. Rankin confirmed its cometary nature using
the Catalina Sky Survey-Kuiper telescope (V06), noting a 6" condensed coma
detected on Apr. 19.

Observations:
    CK21G010* C2021 04 11.32667714 19 13.62 +55 04 30.2          21.72GVEJ072G96
    CK21G010  C2021 04 11.33188814 19 12.57 +55 04 35.9          21.09GVEJ072G96
    CK21G010  C2021 04 11.33710514 19 11.56 +55 04 41.8          22.00GVEJ072G96
    CK21G010  C2021 04 11.34231514 19 10.46 +55 04 46.2          20.89GVEJ072G96
    CK21G010 HC2021 04 11.36843314 19 05.24 +55 05 13.2          20.84GVEJ072G96
    CK21G010 HC2021 04 11.38509914 19 01.87 +55 05 31.2          21.47GVEJ072G96
    CK21G010 HC2021 04 11.39353714 19 00.07 +55 05 39.9          21.09GVEJ072G96
    CK21G010 mC2021 04 12.38995214 15 38.83 +55 22 29.7          22.15GVEJ072V00
    CK21G010 mC2021 04 12.39082314 15 38.62 +55 22 30.4          21.68GVEJ072V00
    CK21G010 mC2021 04 12.39169914 15 38.48 +55 22 31.5          21.39GVEJ072V00
    CK21G010 mC2021 04 12.39257714 15 38.27 +55 22 32.6          21.31GVEJ072V00
    CK21G010 1C2021 04 13.09289 14 13 14.97 +55 33 57.1          21.5 VVEJ072033
    CK21G010 1C2021 04 13.09648 14 13 14.21 +55 34 00.5          21.6 VVEJ072033
    CK21G010 1C2021 04 13.10006 14 13 13.44 +55 34 04.2          21.5 VVEJ072033
    CK21G010 |C2021 04 13.35793 14 12 20.48 +55 38 12.1                VEJ072H06
    CK21G010 |C2021 04 13.37187 14 12 17.54 +55 38 26.0          21.2 GVEJ072H06
    CK21G010 KC2021 04 13.48490414 11 54.01 +55 40 13.1          21.05GVEJ072I52
    CK21G010 KC2021 04 13.48995314 11 53.03 +55 40 16.6          22.02GVEJ072I52
    CK21G010 KC2021 04 14.41080314 08 41.58 +55 54 33.4          20.91GVEJ072V06
    CK21G010 KC2021 04 14.41476414 08 41.02 +55 54 35.5          21.24GVEJ072V06
    CK21G010 KC2021 04 14.41872514 08 39.87 +55 54 41.0          21.44GVEJ072V06
    CK21G010 KC2021 04 14.42268414 08 39.06 +55 54 43.8          21.21GVEJ072V06
    CK21G010 KC2021 04 15.94979714 03 16.78 +56 17 03.5          21.7 GVEJ072L01
    CK21G010 KC2021 04 15.95253014 03 16.17 +56 17 05.9          21.6 GVEJ072L01
    CK21G010 KC2021 04 15.95682414 03 15.22 +56 17 10.0          21.4 GVEJ072L01
    CK21G010 KC2021 04 15.96072714 03 14.43 +56 17 12.2          21.5 GVEJ072L01
    CK21G010 KC2021 04 17.18407013 58 52.33 +56 33 51.6          21.52GVEJ072I52
    CK21G010 KC2021 04 17.19481613 58 50.01 +56 34 01.2          21.34GVEJ072I52
    CK21G010 KC2021 04 18.20495713 55 11.10 +56 46 56.6          20.69GVEJ072I52
    CK21G010 KC2021 04 18.21033213 55 09.77 +56 47 01.4          21.25GVEJ072I52
    CK21G010 KC2021 04 18.21570513 55 08.55 +56 47 05.8          22.17GVEJ072I52
    CK21G010 KC2021 04 20.20613813 47 52.19 +57 10 22.0                VEJ072V06
    CK21G010 KC2021 04 20.21010013 47 51.23 +57 10 24.4                VEJ072V06
    CK21G010 KC2021 04 20.21406013 47 50.26 +57 10 25.7          21.66GVEJ072V06
    CK21G010  C2021 04 21.42623413 43 21.31 +57 23 08.7          21.08GVEJ072G96
    CK21G010  C2021 04 21.43354813 43 19.69 +57 23 12.8          21.51GVEJ072G96
    CK21G010  C2021 04 21.44997213 43 16.05 +57 23 23.3          21.58GVEJ072G96
    CK21G010 KC2021 04 22.18351513 40 33.25 +57 30 33.0                VEJ072V06
    CK21G010 KC2021 04 22.18752313 40 32.26 +57 30 35.5                VEJ072V06
    CK21G010 KC2021 04 22.19150013 40 31.35 +57 30 37.0          21.97GVEJ072V06
    CK21G010 KC2021 04 22.19546613 40 30.46 +57 30 39.6          22.13GVEJ072V06
    CK21G010  C2021 04 30.23032013 10 35.11 +58 22 45.3          21.69GVEJ072G96
    CK21G010  C2021 04 30.23907413 10 33.22 +58 22 47.1          21.24GVEJ072G96
    CK21G010  C2021 04 30.24814313 10 31.20 +58 22 49.7          22.83GVEJ072G96
    CK21G010  C2021 04 30.25689813 10 29.17 +58 22 51.3          22.68GVEJ072G96
    CK21G010 KC2021 05 06.19610312 49 06.73 +58 32 01.4          21.24GVEJ072V06
    CK21G010 KC2021 05 06.19928312 49 06.01 +58 32 01.1          22.29GVEJ072V06
    CK21G010 KC2021 05 06.20246412 49 05.33 +58 32 01.4          21.83GVEJ072V06

Observer details:
033 Karl Schwarzschild Observatory, Tautenburg.  Observers S. Melnikov, C.
    Hoegner, U. Laux, F. Ludwig, B. Stecklum.  Measurer B. Stecklum.  1.34-m
    f/3 Schmidt + CCD.
G96 Mt. Lemmon Survey.  Observer G. J. Leonard.  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.
H06 iTelescope Observatory, Mayhill.  Observer H. Sato.  0.43-m f/6.8
    astrograph + CCD + f/4.5 focal reducer.
I52 Steward Observatory, Mt. Lemmon Station.  Observers D. C. Fuls, H.
    Groeller.  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.  1.0-m reflector + CCD.
L01 Visnjan Observatory, Tican.  Observer K. Korlevic.  1.0-m f/2.9 reflector
    + CCD.
V00 Kitt Peak-Bok.  Observer H. Groeller.  Measurers M. J. Brucker, E. J.
    Christensen, C. E. Woodward, G. A. Farneth, D. C. Fuls, A. R. Gibbs, A. D.
    Grauer, H. Groeller, R. A. Kowalski, S. M. Larson, G. J. Leonard, R. S.
    McMillan, T. A. Pruyne, D. Rankin, R. L. Seaman, F. C. Shelly, K. W.
    Wierzchos.  2.25-m reflector + CCD.
V06 Catalina Sky Survey-Kuiper.  Observers D. C. Fuls, D. Rankin, G. J.
    Leonard.  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.  1.55-m reflector + 1K CCD.

Orbital elements:
    C/2021 G1 (Leonard)                                                         
Epoch 2021 July 5.0 TT = JDT 2459400.5                                          
T 2021 July 22.22970 TT                                 Rudenko                 
q   3.4236653            (2000.0)            P               Q                  
z  +0.0133307      Peri.  107.48180     -0.63642339     +0.18779561             
 +/-0.0000000      Node   270.69110     -0.01527375     +0.96665087             
e   0.9543602      Incl.  131.56667     +0.77118868     +0.17412327             
>From 48 observations 2021 Apr. 11-May 6, mean residual 0".5.                    
                                                                                
    C/2021 G1 (Leonard)                                                         
Epoch 2020 Dec. 17.0 TT = JDT 2459200.5                                         
T 2021 July 22.26578 TT                                 Rudenko                 
q   3.4236345            (2000.0)            P               Q                  
z  +0.0134262      Peri.  107.48458     -0.63638954     +0.18789506             
 +/-0.0000000      Node   270.68692     -0.01518553     +0.96663940             
e   0.9540337      Incl.  131.56640     +0.77121836     +0.17407961             
>From 48 observations 2021 Apr. 11-May 6, mean residual 0".5.                    
                                                                                
Ephemeris:
Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase   m1    m2
2021 04 06    14 36 11.8 +53 23 41   2.9926  3.5586   116.9    14.5  21.9
...
2021 04 21    13 44 56.4 +57 18 47   3.0384  3.5242   110.9    15.4  21.9
...
2021 04 29    13 15 08.2 +58 17 48   3.0951  3.5078   105.9    16.0  21.9
...
2021 05 05    12 53 19.2 +58 32 01   3.1498  3.4964   101.7    16.4  21.9
2021 05 06    12 49 48.0 +58 32 04   3.1598  3.4946   100.9    16.5  21.9
2021 05 07    12 46 19.3 +58 31 30   3.1700  3.4928   100.2    16.5  21.9
...
2021 05 13    12 26 30.0 +58 16 07   3.2359  3.4824    95.6    16.8  22.0
...
2021 05 21    12 03 24.8 +57 29 10   3.3334  3.4699    89.2    17.0  22.0
...
2021 06 05    11 31 16.0 +55 11 09   3.5328  3.4504    77.1    16.7  22.1

M. P. C. Staff               (C) Copyright 2021 MPC           M.P.E.C. 2021-J72




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