[Iaude] MPEC J71: COMET C/2021 E3 (ZTF)

mpec at marsden.cfa.harvard.edu mpec at marsden.cfa.harvard.edu
Thu May 6 01:53:25 EDT 2021


M.P.E.C. 2021-J71                                   Issued 2021 May 6, 05:51 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 E3 (ZTF)                              

     An object detected on Mar. 9 UT by Palomar Mountain-ZTF (I41) was 
initially reported as a possible NEO.  E. Guido reports a condensed 7" coma
in a stack of 14 120-second unfiltered exposures taken on Mar. 19 by Telescope
Live, Oria (Z08).  Additional reports of cometary features are as follows:

OC   Date        Reporter           Coma    Tail    PA          Exposures
B96  2021-04-17  E. Bryssinck       8"      7"     335           30x120s
N51  2021-04-18  K. Sharma          3"      5"      97              300s

Observations:
    CK21E030* C2021 03 09.52861020 45 47.31 +30 53 11.2          19.60rUEJ071I41
    CK21E030  C2021 03 09.53355020 45 47.45 +30 53 12.1          19.70rUEJ071I41
    CK21E030  C2021 03 09.53602020 45 47.52 +30 53 12.6          19.59rUEJ071I41
    CK21E030  C2021 03 09.53850020 45 47.62 +30 53 13.0          19.54rUEJ071I41
    CK21E030 bC2021 03 10.14392820 46 06.59 +30 54 43.4          20.1 GVEJ071L01
    CK21E030 bC2021 03 10.17411820 46 07.45 +30 54 47.4          19.9 GVEJ071L01
    CK21E030 HC2021 03 10.51352 20 46 18.11 +30 55 39.6          19.3 RoEJ071291
    CK21E030 HC2021 03 10.51848 20 46 18.24 +30 55 39.8                oEJ071291
    CK21E030 HC2021 03 10.52271 20 46 18.37 +30 55 40.8                oEJ071291
    CK21E030 HC2021 03 10.52733 20 46 18.48 +30 55 41.5                oEJ071291
    CK21E030 KC2021 03 11.19600320 46 39.229+30 57 23.71         19.1 GVEJ071Z33
    CK21E030 KC2021 03 11.20032620 46 39.344+30 57 23.98         19.8 GVEJ071Z33
    CK21E030 3C2021 03 11.20649320 46 39.506+30 57 25.72         19.7 GVEJ071C65
    CK21E030 3C2021 03 11.20977820 46 39.623+30 57 25.54         19.6 GVEJ071C65
    CK21E030 3C2021 03 11.21306720 46 39.782+30 57 26.72         19.6 GVEJ071C65
    CK21E030 3C2021 03 11.21635620 46 39.878+30 57 26.61         19.9 GVEJ071C65
    CK21E030 KC2021 03 12.17038020 47 09.07 +30 59 57.4          19.8 GVEJ071Z33
    CK21E030 KC2021 03 12.18331520 47 09.49 +30 59 59.9          19.4 GVEJ071Z33
    CK21E030 1C2021 03 14.10640 20 48 07.42 +31 05 17.4          20.0 VVEJ071033
    CK21E030 1C2021 03 14.10727 20 48 07.45 +31 05 17.5          20.2 VVEJ071033
    CK21E030 1C2021 03 14.10813 20 48 07.48 +31 05 17.6          20.1 VVEJ071033
    CK21E030 1C2021 03 14.10905 20 48 07.49 +31 05 17.7          19.9 VVEJ071033
    CK21E030  C2021 03 14.94698 20 48 32.32 +31 07 41.5          19.9 rVEJ071N51
    CK21E030  C2021 03 14.95071 20 48 32.45 +31 07 42.5          19.9 rVEJ071N51
    CK21E030  C2021 03 14.95435 20 48 32.59 +31 07 43.6          19.8 rVEJ071N51
    CK21E030 KC2021 03 14.95823 20 48 32.67 +31 07 43.7          19.5 rVEJ071N51
    CK21E030  C2021 03 14.96161 20 48 32.80 +31 07 43.9          19.9 rVEJ071N51
    CK21E030  C2021 03 14.96521 20 48 32.91 +31 07 45.3          19.9 rVEJ071N51
    CK21E030  C2021 03 14.96881 20 48 32.99 +31 07 45.9          20.0 rVEJ071N51
    CK21E030 KC2021 03 14.97062 20 48 33.04 +31 07 46.1          18.6 rVEJ071N51
    CK21E030  C2021 03 14.97242 20 48 33.11 +31 07 46.3          19.9 rVEJ071N51
    CK21E030  C2021 03 14.97603 20 48 33.19 +31 07 46.7          19.9 rVEJ071N51
    CK21E030 |C2021 03 18.49676 20 50 14.39 +31 18 28.4                VEJ071H06
    CK21E030 |C2021 03 18.50115 20 50 14.48 +31 18 29.8          19.7 GVEJ071H06
    CK21E030 KC2021 03 19.18992 20 50 33.65 +31 20 41.2          19.1 GVEJ071Z08
    CK21E030 KC2021 03 19.20157 20 50 33.99 +31 20 42.9          19.4 GVEJ071Z08
    CK21E030 KC2021 03 20.13617 20 50 59.69 +31 23 47.0                VEJ071204
    CK21E030 KC2021 03 20.15646 20 51 00.26 +31 23 51.4          19.5 GVEJ071204
    CK21E030 KC2021 03 26.13523 20 53 35.34 +31 44 50.4          19.3 GVEJ071204
    CK21E030 KC2021 03 26.15557 20 53 35.85 +31 44 55.3                VEJ071204
    CK21E030 KC2021 03 30.12914 20 55 09.39 +32 00 12.7          19.3 VVEJ071L06
    CK21E030 KC2021 03 30.13477 20 55 09.49 +32 00 13.9          19.4 VVEJ071L06
    CK21E030 KC2021 03 30.14040 20 55 09.62 +32 00 15.4          19.1 VVEJ071L06
    CK21E030 KC2021 03 31.11859 20 55 31.31 +32 04 11.9                VEJ071204
    CK21E030 KC2021 03 31.14484 20 55 31.89 +32 04 18.0          19.5 GVEJ071204
    CK21E030 8C2021 04 01.21853 20 55 55.17 +32 08 41.6          19.5 RVEJ071J13
    CK21E030 8C2021 04 01.22222 20 55 55.29 +32 08 42.5          19.4 RVEJ071J13
    CK21E030 8C2021 04 01.22590 20 55 55.36 +32 08 43.6          19.3 RVEJ071J13
    CK21E030 ,C2021 04 09.62745820 58 34.33 +32 45 21.6          20.1 GVEJ071F65
    CK21E030 ,C2021 04 09.63074920 58 34.37 +32 45 22.7          18.8 GVEJ071F65
    CK21E030 ,C2021 04 09.63404120 58 34.42 +32 45 23.6          19.2 GVEJ071F65
    CK21E030 ,C2021 04 09.63733220 58 34.47 +32 45 24.4          19.4 GVEJ071F65
    CK21E030  C2021 04 14.93902820 59 51.70 +33 10 26.1          18.9 rVEJ071N51
    CK21E030  C2021 04 14.94975720 59 51.82 +33 10 29.3          19.0 rVEJ071N51
    CK21E030  C2021 04 14.95333320 59 51.90 +33 10 30.1          18.9 rVEJ071N51
    CK21E030  C2021 04 14.95723420 59 51.91 +33 10 31.6          18.8 rVEJ071N51
    CK21E030  C2021 04 14.96081020 59 51.97 +33 10 33.1          18.9 rVEJ071N51
    CK21E030  C2021 04 14.96438720 59 51.97 +33 10 33.7          18.9 rVEJ071N51
    CK21E030  C2021 04 14.96769320 59 52.04 +33 10 34.6          19.0 rVEJ071N51
    CK21E030  C2021 04 14.97542820 59 52.16 +33 10 37.2          18.9 rVEJ071N51
    CK21E030 KC2021 04 17.07595 21 00 17.14 +33 20 53.5          19.7 GVEJ071B96
    CK21E030 KC2021 04 17.09655 21 00 17.34 +33 20 58.6          18.8 RqEJ071215
    CK21E030 KC2021 04 17.09913 21 00 17.36 +33 20 59.6          18.8 RqEJ071215
    CK21E030 KC2021 04 17.10044 21 00 17.44 +33 21 00.7          19.6 GVEJ071B96
    CK21E030 KC2021 04 17.10171 21 00 17.43 +33 20 59.8          18.6 RqEJ071215
    CK21E030  C2021 04 18.95797521 00 36.82 +33 30 13.8          19.2 rVEJ071N51
    CK21E030  C2021 04 18.96155121 00 36.86 +33 30 15.3          19.3 rVEJ071N51
    CK21E030  C2021 04 18.96512721 00 36.88 +33 30 16.3          19.3 rVEJ071N51
    CK21E030  C2021 04 18.96870421 00 36.90 +33 30 17.3          19.2 rVEJ071N51
    CK21E030 KC2021 04 20.42631821 00 50.27 +33 37 37.0          18.7 VqEJ071858
    CK21E030 KC2021 04 20.44118721 00 50.36 +33 37 41.9          18.4 VqEJ071858
    CK21E030 KC2021 04 20.45605221 00 50.52 +33 37 46.6          18.2 VqEJ071858
    CK21E030 KC2021 04 21.07877 21 00 55.62 +33 40 55.2                VEJ071118
    CK21E030 KC2021 04 21.09194 21 00 55.80 +33 40 59.4                VEJ071118
    CK21E030 KC2021 04 23.04034921 01 10.01 +33 50 55.4          19.7 GVEJ071Z99
    CK21E030 KC2021 04 23.04438521 01 10.04 +33 50 56.7          19.8 GVEJ071Z99
    CK21E030 KC2021 04 23.04842121 01 10.08 +33 50 58.3          19.7 GVEJ071Z99
    CK21E030 KC2021 04 23.09105 21 01 10.36 +33 51 11.7          19.2 GVEJ071K74
    CK21E030 KC2021 04 23.09492 21 01 10.39 +33 51 13.3          19.6 GVEJ071K74
    CK21E030 KC2021 04 23.10225 21 01 10.45 +33 51 15.3          19.2 GVEJ071K74
    CK21E030 KC2021 04 24.06325421 01 16.27 +33 56 11.6          19.3 GVEJ071595
    CK21E030 KC2021 04 24.06736121 01 16.26 +33 56 13.4          18.8 GVEJ071595
    CK21E030 KC2021 04 24.07148521 01 16.33 +33 56 14.6          19.1 GVEJ071595
    CK21E030 KC2021 04 24.11234 21 01 16.73 +33 56 30.0          18.9 RqEJ071C10
    CK21E030 KC2021 04 24.13464 21 01 16.72 +33 56 32.4          18.9 RqEJ071C10
    CK21E030 KC2021 05 05.38173221 01 24.56 +34 55 55.5          18.8 VqEJ071858
    CK21E030 KC2021 05 05.39652121 01 24.46 +34 56 00.6                qEJ071858
    CK21E030 KC2021 05 05.41131121 01 24.44 +34 56 05.5          18.6 VqEJ071858

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.
118 Astronomical and Geophysical Observatory, Modra.  Observer S. Gajdos.
    0.6-m f/5.5 reflector + CCD.
204 Schiaparelli Observatory.  Observer L. Buzzi.  Measurer A. Aletti.  0.84-m
    f/3.5 reflector + CCD.
215 Buchloe.  Observer W. Hasubick.  0.44-m f/4.6 reflector + CCD.
291 LPL/Spacewatch II.  Observer J. V. Scotti.  1.8-m f/2.7 reflector + CCD.
595 Farra d'Isonzo.  Observers S. Aschi, E. Pettarin.  Measurer E. Pettarin.
    0.61-m f/4.5 reflector + CCD.
858 Tebbutt Observatory, Edgewood.  Observer F. B. Zoltowski.  0.16-m
    refractor + CCD.
B96 Brixiis Observatory, Kruibeke.  Observer E. Bryssinck.  0.4-m f/3.8
    reflector + CCD.
C10 Maisoncelles.  Observer J.-F. Soulier.  0.30-m f/3.8 Newtonian reflector +
    CCD.
C65 Observatori Astronomic del Montsec.  Observers T. Santana-Ros, P. Gil.
    Measurer M. Micheli.  0.80-m f/9.6 Ritchey-Chretien + CCD.
F65 Haleakala-Faulkes Telescope North.  Observers J. D. Armstrong, J. O.
    Teagarden.  2.0-m f/10 reflector + CCD.
H06 iTelescope Observatory, Mayhill.  Observer H. Sato.  0.51-m f/6.8
    astrograph + CCD + f/4.5 focal reducer.
I41 Palomar Mountain--ZTF.  Observers B. T. Bolin, Z. T. F. Collaboration.
    Measurers B. T. Bolin, W.-H. Ip, Z.-Y. Lin, F. J. Masci.  1.2-m f/2.4
    Schmidt.
J13 La Palma-Liverpool Telescope.  Observer C. Copperwheat.  Measurers J. N.
    Purdum, B. T. Bolin.  2.0-m f/10 Ritchey-Chretien + CCD.
K74 Muensterschwarzach Observatory, Schwarzach.  Observer C. Gerhard.  0.30-m
    f/3.75 Newtonian reflector + CCD.
L01 Visnjan Observatory, Tican.  Observer 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.  0.36-m Schmidt-Cassegrain + CCD.
N51 GROWTH India Telescope, IAO, Hanle.  Observers K. Sharma, H. Kumar, J.
    Stanzin, V. Bhalerao, G. C. Anupama, S. Barway, S. Joharle, R. Norbu.
    Measurers K. Sharma, B. T. Bolin.  0.70-m f/6.5 Corrected Dall-Kirkham +
    CCD.
Z08 Telescope Live, Oria.  Observers E. Guido, M. Rocchetto, E. Bryssinck, M.
    Fulle, G. Milani, C. Nassef, G. Savini, A. Valvasori.  0.7-m f/8 Ritchey-
    Chretien + CCD.
Z33 6ROADS Observatory 2, Nerpio.  Observers R. Reszelewski, M. Zolnowski, M.
    Gedek, K. Zukowski, T. Santana-Ros, L. Conversi, M. Micheli.  Measurers M.
    Micheli, R. Reszelewski.  0.4-m f/7 reflector + CCD, 0.4-m f/8 reflector +
    CCD.
Z99 Clixby Observatory, Cleethorpes.  Observer A. Mickleburgh.  0.36-m f/8
    Schmidt-Cassegrain + CCD.

Orbital elements:
    C/2021 E3 (ZTF)                                                             
Epoch 2022 June 30.0 TT = JDT 2459760.5                                         
T 2022 June 11.81547 TT                                 Rudenko                 
q   1.7774738            (2000.0)            P               Q                  
z  -0.0005034      Peri.  228.83874     -0.11527430     -0.43249398             
 +/-0.0002234      Node   104.46190     -0.37434517     +0.85277984             
e   1.0008948      Incl.  112.55681     -0.92009648     -0.29277209             
>From 88 observations 2021 Mar. 9-May 5, mean residual 0".5.                     
                                                                                
    C/2021 E3 (ZTF)                                                             
Epoch 2020 Dec. 17.0 TT = JDT 2459200.5                                         
T 2022 June 11.94298 TT                                 Rudenko                 
q   1.7774210            (2000.0)            P               Q                  
z  -0.0001769      Peri.  228.85055     -0.11571254     -0.43246946             
 +/-0.0002234      Node   104.44827     -0.37421775     +0.85288711             
e   1.0003144      Incl.  112.57216     -0.92009330     -0.29249572             
>From 88 observations 2021 Mar. 9-May 5, mean residual 0".5.                     
                                                                                
Ephemeris:
Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase   m1    m2
2021 04 06    20 57 30.8 +32 29 03   5.4936  5.0977    61.8    10.0  19.3
...
2021 04 21    21 00 55.0 +33 40 32   5.2229  4.9668    69.8    10.9  19.1
...
2021 04 29    21 01 33.9 +34 22 00   5.0688  4.8967    74.5    11.4  18.9
...
2021 05 05    21 01 26.1 +34 53 54   4.9499  4.8440    78.1    11.8  18.8
2021 05 06    21 01 21.5 +34 59 15   4.9298  4.8352    78.7    11.8  18.8
2021 05 07    21 01 15.8 +35 04 36   4.9097  4.8263    79.4    11.9  18.8
...
2021 05 13    21 00 20.2 +35 36 35   4.7881  4.7734    83.1    12.1  18.7
...
2021 05 21    20 58 04.2 +36 18 03   4.6241  4.7027    88.2    12.4  18.5
...
2021 06 05    20 50 17.2 +37 26 15   4.3176  4.5696    97.9    12.7  18.3

M. P. C. Staff               (C) Copyright 2021 MPC           M.P.E.C. 2021-J71




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