[Iaude] MPEC X71: COMET P/2020 X1 (ATLAS)

mpec at marsden.cfa.harvard.edu mpec at marsden.cfa.harvard.edu
Tue Dec 8 22:18:24 EST 2020


M.P.E.C. 2020-X71                              Issued 2020 December 9, 03:16 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 P/2020 X1 (ATLAS)                             

     A. Fitzsimmons reports the discovery of a comet in four 30-second 
exposures obtained ATLAS-HKO survey (T05) on Dec. 4 UT.  He reports
a condensed 10" coma extending 6 arcsec towards position angle 220 deg.
Several  prediscovery positions were subsequently reported from Dec. 2020.
Additional reports of  cometary features are as follows:

OC   Date        Reporter           Coma    Tail    PA          Exposures
F51  2020-12-02  R. Weryk           0".7			  4x45s
B49  2020-12-04  J. Camarasa       10".8  
P87  2020-12-05  K. Yoshimoto      18"                           24x60s
H06  2020-12-07  H. Sato           12"                           12x60s
H06  2020-12-08  A. Valvasori      10"                           30x60s
H06  2020-12-08  G. Gasparovic     10"                           39x60s
B96  2020-12-08  E. Bryssinck      12"      14"     225          35x120s

Observations:
    PK20X010  C2020 12 01.45949302 45 24.57 +11 22 17.0          17.84oVEX071T08
    PK20X010  C2020 12 01.46318202 45 24.42 +11 22 19.5          18.30oVEX071T08
    PK20X010  C2020 12 01.47015402 45 24.08 +11 22 22.2          18.00oVEX071T08
    PK20X010  C2020 12 01.48608502 45 23.21 +11 22 30.0          18.19oVEX071T08
    PK20X010  C2020 12 02.32221602 44 42.78 +11 28 46.9          18.06GVEX071703
    PK20X010  C2020 12 02.32835702 44 42.44 +11 28 50.3          18.14GVEX071703
    PK20X010  C2020 12 02.33449502 44 42.09 +11 28 52.4          18.35GVEX071703
    PK20X010  C2020 12 02.34063702 44 41.82 +11 28 55.6          18.62GVEX071703
    PK20X010  C2020 12 02.46559 02 44 35.807+11 29 53.27         18.7 iUEX071F51
    PK20X010  C2020 12 02.46624 02 44 35.780+11 29 53.62         18.6 iUEX071F51
    PK20X010  C2020 12 02.47657 02 44 35.271+11 29 58.24         18.8 iUEX071F51
    PK20X010  C2020 12 02.47722 02 44 35.239+11 29 58.54         18.6 iUEX071F51
    PK20X010  C2020 12 02.48759 02 44 34.733+11 30 03.25         18.8 iUEX071F51
    PK20X010  C2020 12 02.48824 02 44 34.697+11 30 03.56         18.7 iUEX071F51
    PK20X010  C2020 12 02.49858 02 44 34.194+11 30 08.29         18.8 iUEX071F51
    PK20X010  C2020 12 02.49923 02 44 34.162+11 30 08.54         18.7 iUEX071F51
    PK20X010  C2020 12 03.40525402 43 51.43 +11 37 01.0          18.51oVEX071T05
    PK20X010  C2020 12 03.41176702 43 51.12 +11 37 04.2          18.75oVEX071T05
    PK20X010  C2020 12 03.42237002 43 50.61 +11 37 08.9          18.48oVEX071T05
    PK20X010  C2020 12 03.42651702 43 50.45 +11 37 10.3          18.61oVEX071T05
    PK20X010* C2020 12 04.44516902 43 03.36 +11 44 55.5          18.92oVEX071T05
    PK20X010  C2020 12 04.45070202 43 03.15 +11 44 56.9          18.55oVEX071T05
    PK20X010  C2020 12 04.45436402 43 02.95 +11 44 59.1          18.46oVEX071T05
    PK20X010  C2020 12 04.46818002 43 02.36 +11 45 05.8          18.78oVEX071T05
    PK20X010 KC2020 12 04.74608202 42 50.13 +11 47 11.1          18.8 GVEX071B49
    PK20X010 KC2020 12 04.75658602 42 49.60 +11 47 16.4          19.3 GVEX071B49
    PK20X010 KC2020 12 05.10236 02 42 34.10 +11 49 55.1          18.5 GVEX071V01
    PK20X010 KC2020 12 05.10820302 42 33.81 +11 49 58.6                VEX071I52
    PK20X010 KC2020 12 05.11232602 42 33.66 +11 50 00.0          18.86GVEX071I52
    PK20X010 KC2020 12 05.11718202 42 33.40 +11 50 02.5          18.81GVEX071I52
    PK20X010 KC2020 12 05.12234302 42 33.21 +11 50 05.0          19.09GVEX071I52
    PK20X010 KC2020 12 05.17442 02 42 30.72 +11 50 27.8          18.2 GVEX071V01
    PK20X010 KC2020 12 05.52387 02 42 15.25 +11 53 08.4                VEX071P87
    PK20X010 KC2020 12 05.53290 02 42 14.90 +11 53 12.8          19.0 RVEX071P87
    PK20X010 3C2020 12 06.07300 02 41 51.23 +11 57 25.7          18.3 GVEX071W88
    PK20X010 KC2020 12 06.09057 02 41 50.58 +11 57 28.5          18.6 GVEX071V01
    PK20X010 KC2020 12 06.12141 02 41 49.27 +11 57 43.1          18.3 GVEX071V01
    PK20X010 KC2020 12 06.12375 02 41 48.96 +11 57 49.2          19.0 VqEX071I47
    PK20X010 3C2020 12 06.12506 02 41 48.88 +11 57 49.1          18.7 GVEX071W88
    PK20X010 KC2020 12 06.13574 02 41 48.40 +11 57 54.9          19.0 VqEX071I47
    PK20X010 KC2020 12 06.14774 02 41 47.92 +11 58 00.7          19.0 VqEX071I47
    PK20X010 KC2020 12 06.74582 02 41 22.34 +12 02 29.9          18.9 VVEX071L04
    PK20X010 KC2020 12 06.76156 02 41 21.66 +12 02 37.7          19.0 VVEX071L04
    PK20X010 KC2020 12 06.81937402 41 19.22 +12 03 03.6          19.1 GVEX071Z99
    PK20X010 KC2020 12 06.82477702 41 19.01 +12 03 06.5          19.3 GVEX071Z99
    PK20X010 KC2020 12 06.83016702 41 18.78 +12 03 08.6          19.1 GVEX071Z99
    PK20X010 KC2020 12 06.99544 02 41 11.74 +12 04 24.6          17.4 GVEX071J22
    PK20X010 KC2020 12 07.00137 02 41 11.38 +12 04 29.7          17.5 GVEX071J22
    PK20X010 KC2020 12 07.00730 02 41 11.01 +12 04 32.3          17.7 GVEX071J22
    PK20X010 |C2020 12 07.06217 02 41 09.03 +12 04 56.6                VEX071H06
    PK20X010 |C2020 12 07.06746 02 41 08.82 +12 04 59.3          18.8 GVEX071H06
    PK20X010 %C2020 12 07.13336 02 41 05.77 +12 05 33.8          18.5 GVEX071W88
    PK20X010 %C2020 12 07.14300 02 41 05.35 +12 05 38.0          18.5 GVEX071W88
    PK20X010 KC2020 12 07.88305 02 40 34.74 +12 11 15.3          19.8 GVEX071595
    PK20X010 KC2020 12 07.89697 02 40 34.10 +12 11 22.2          19.6 GVEX071595
    PK20X010 tC2020 12 08.13702 02 40 24.44 +12 13 13.8          19.3 VqEX071H06
    PK20X010 tC2020 12 08.15514 02 40 23.68 +12 13 22.2          19.5 VqEX071H06
    PK20X010 eC2020 12 08.23830 02 40 20.21 +12 14 00.1          19.1 GVEX071H06
    PK20X010  C2020 12 08.25174702 40 19.802+12 14 08.29         20.00wUEX071F51
    PK20X010 eC2020 12 08.25392 02 40 19.52 +12 14 09.1          18.9 GVEX071H06
    PK20X010  C2020 12 08.26402502 40 19.303+12 14 14.41         19.94wUEX071F51
    PK20X010  C2020 12 08.27639402 40 18.790+12 14 19.95         19.91wUEX071F51
    PK20X010  C2020 12 08.28887402 40 18.256+12 14 25.89         19.77wUEX071F51

Observer details:
595 Farra d'Isonzo.  Observer E. Pettarin.  0.40-m f/5.15 reflector + CCD.
703 Catalina Sky Survey.  Observer 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.  0.68-m Schmidt + 10K CCD.
B49 Paus Observatory, Sabadell.  Observer J. Camarasa.  0.30-m f/4 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.
H06 iTelescope Observatory, Mayhill.  Observers H. Sato, G. Gasparovic, Y.
    Chen, A. Valvasori, E. Guido.  Measurers H. Sato, G. Gasparovic, Y. Chen,
    G. Y. Gasparovic, A. Valvasori.  0.43-m f/6.8 astrograph + CCD + f/4.5
    focal reducer, 0.50-m f/6.8 reflector + CCD + f/4.5 focal reducer, 0.43-m
    f/4.5 reflector + CCD.
I47 Pierre Auger Observatory, Malargue.  Observer M. Masek.  0.3-m f/6.8
    reflector + CCD.
I52 Steward Observatory, Mt. Lemmon Station.  Observer D. C. Fuls.  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.
J22 Tacande Observatory, La Palma.  Observer K. Hills.  0.5-m f/3.0 astrograph
    + CCD.
L04 ROASTERR-1 Observatory, Cluj-Napoca.  Observer L. Hudin.  0.3-m f/5
    reflector + CCD.
P87 Hirao Observatory, Yamaguchi.  Observer K. Yoshimoto.  0.20-m f/8.0
    Ritchey-Chretien + CCD + f/5.4 focal reducer.
T05 ATLAS-HKO, Haleakala.  Observers L. Denneau, J. Tonry, A. Heinze, H.
    Weiland.  Measurers L. Denneau, J. Tonry, A. Heinze, H. Weiland, H.
    Flewelling, A. Fitzsimmons, J. Robinson, N. Erasmus.  0.5-m reflector +
    CCD.
T08 ATLAS-MLO, Mauna Loa.  Observers L. Denneau, J. Tonry, A. Heinze, H.
    Weiland.  Measurers L. Denneau, J. Tonry, A. Heinze, H. Weiland, H.
    Flewelling, A. Fitzsimmons, J. Robinson, N. Erasmus.  0.5-m reflector +
    CCD.
V01 Mountainville Observatory, Alpine.  Observer B. Sheets.  0.36-m reflector
    + CCD.
W88 Slooh.com Chile Observatory, La Dehesa.  Observers B. Lutkenhoner, N.
    Paul.  0.43-m f/6.8 Corrected Dall-Kirkham + CCD.
Z99 Clixby Observatory, Cleethorpes.  Observer A. Mickleburgh.  0.36-m f/8
    Schmidt-Cassegrain + CCD.

Orbital elements:
    P/2020 X1 (ATLAS)                                                           
Epoch 2020 Aug. 19.0 TT = JDT 2459080.5                                         
T 2020 Aug. 1.31597 TT                                  Veres                   
q   2.8894078            (2000.0)            P               Q                  
n   0.10289608     Peri.  326.17293     +0.85733620     -0.27659196             
a   4.5102799      Node    56.06637     +0.50525866     +0.61343436             
e   0.3593728      Incl.   31.55055     -0.09842926     +0.73972641             
P   9.58                                                                        
>From 63 observations 2020 Dec. 1-8, mean residual 0".5.                         
                                                                                
    P/2020 X1 (ATLAS)                                                           
Epoch 2030 Feb. 28.0 TT = JDT 2462560.5                                         
T 2030 Mar. 16.34829 TT                                 Veres                   
q   2.9094264            (2000.0)            P               Q                  
n   0.10212170     Peri.  326.30882     +0.85719849     -0.27821831             
a   4.5330518      Node    56.02087     +0.50583258     +0.61282002             
e   0.3581749      Incl.   31.50711     -0.09666513     +0.73962571             
P   9.65                                                                        
>From 63 observations 2020 Dec. 1-8, mean residual 0".5.                         
                                                                                
    P/2020 X1 (ATLAS)                                                           
Epoch 2020 Dec. 17.0 TT = JDT 2459200.5                                         
T 2020 Aug. 1.36997 TT                                  Veres                   
q   2.8894477            (2000.0)            P               Q                  
n   0.10287144     Peri.  326.18444     +0.85728068     -0.27678388             
a   4.5110000      Node    56.06712     +0.50538435     +0.61334123             
e   0.3594663      Incl.   31.54921     -0.09826748     +0.73973185             
P   9.58                                                                        
>From 63 observations 2020 Dec. 1-8, mean residual 0".5.                         
                                                                                
Ephemeris:
Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase   m1    m2
2020 11 09    03 07 09.7 +08 43 05   1.9681  2.9514   171.5     2.8  19.2
...
2020 11 24    02 51 59.8 +10 27 04   2.0201  2.9709   161.0     6.2  19.3
...
2020 12 02    02 44 58.4 +11 26 23   2.0753  2.9823   152.1     8.9  19.3
...
2020 12 08    02 40 30.0 +12 12 12   2.1282  2.9913   145.3    10.8  19.4
2020 12 09    02 39 49.8 +12 19 56   2.1379  2.9928   144.2    11.1  19.4
2020 12 10    02 39 10.9 +12 27 42   2.1478  2.9944   143.1    11.4  19.4
...
2020 12 16    02 35 47.8 +13 14 46   2.2123  3.0039   136.5    13.0  19.5
...
2020 12 24    02 32 40.7 +14 18 50   2.3101  3.0171   128.0    14.9  19.6
...
2021 01 08    02 31 10.5 +16 22 07   2.5211  3.0436   113.0    17.3  19.8

M. P. C. Staff               (C) Copyright 2020 MPC           M.P.E.C. 2020-X71




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