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  • MPEC 2018-L37 : COMET C/2018 L2 (ATLAS)

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    M.P.E.C. 2018-L37                                Issued 2018 June  9, 00:18 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 C/2018 L2 (ATLAS)
    
         H. Weiland (T08) reported that this object appeared to be a comet, with a
    size of 8".75 in quadrature excess of the stellar profile in 8 images obtained
    on June 6.3 UT.  R. Holmes (807) reported a bright 15" coma in images just
    before June 7.0 UT.  C. Jacques (Y00) reported a 21" coma and a 27" tail in
    P.A. 92, in a stack of five 60s exposures on June 7.0 UT.  S. M. Tilley (Q62)
    reported the object to have tail and coma in stacks of five 60s exposures on
    June 7.6 UT.  A. C. Gilmore (474) reported that the object had a FWHM of
    3".9 (compared to stellar FWHMs of 2".5) and a diffuse fringe to the SE on
    June 3.66-3.67 UT.  L. S. Amaral (X74) reported pre-discovery images from June
    4.0 UT that showed a diffuse 8" coma.
    
    Observations:
        CK18L020  C2018 06 04.07425 13 57 07.92 -43 20 39.2          15.8 RqEL037X74
        CK18L020  C2018 06 04.08370 13 57 07.29 -43 20 22.6          15.3 RqEL037X74
        CK18L020* C2018 06 06.33235 13 55 17.30 -42 18 14.0          15.6 oUEL037T08
        CK18L020  C2018 06 06.33604 13 55 17.11 -42 18 08.0          15.6 oUEL037T08
        CK18L020  C2018 06 06.34020 13 55 16.90 -42 18 00.9          15.6 oUEL037T08
        CK18L020  C2018 06 06.34392 13 55 16.73 -42 17 54.9          15.7 oUEL037T08
        CK18L020  C2018 06 06.34805 13 55 16.51 -42 17 47.8          15.6 oUEL037T08
        CK18L020  C2018 06 06.35176 13 55 16.31 -42 17 41.3          16.3 oUEL037T08
        CK18L020  C2018 06 06.35592 13 55 16.13 -42 17 34.5          15.6 oUEL037T08
        CK18L020  C2018 06 06.35961 13 55 15.98 -42 17 28.3          15.7 oUEL037T08
        CK18L020 KC2018 06 06.96933 13 54 48.17 -42 00 20.6          16.2 VqEL037I39
        CK18L020 3C2018 06 06.98032 13 54 47.74 -42 00 03.6          16.0 VUEL037W88
        CK18L020 3C2018 06 06.98573 13 54 47.47 -41 59 54.6          15.9 VUEL037W88
        CK18L020 KC2018 06 06.98774 13 54 47.32 -41 59 51.6          16.2 VqEL037I39
        CK18L020 |C2018 06 06.99050 13 54 47.27 -41 59 46.7          16.5 GUEL037807
        CK18L020 |C2018 06 06.99136 13 54 47.19 -41 59 44.9          16.8 GUEL037807
        CK18L020 3C2018 06 06.99194 13 54 47.18 -41 59 44.2          16.1 VUEL037W88
        CK18L020 |C2018 06 06.99224 13 54 47.15 -41 59 43.6          16.8 GUEL037807
        CK18L020 |C2018 06 06.99311 13 54 47.15 -41 59 42.3          16.4 GUEL037807
        CK18L020 KC2018 06 07.00251 13 54 46.69 -41 59 27.3          16.0 VqEL037I39
        CK18L020  C2018 06 07.01829 13 54 45.89 -41 59 01.1          16.6 RrEL037Y00
        CK18L020 KC2018 06 07.02715 13 54 45.52 -41 58 44.9          15.7 RqEL037I47
        CK18L020 KC2018 06 07.02970 13 54 45.39 -41 58 40.4          15.7 RqEL037I47
        CK18L020 KC2018 06 07.03225 13 54 45.29 -41 58 35.6          15.7 RqEL037I47
        CK18L020 KC2018 06 07.03834 13 54 44.98 -41 58 26.0          15.8 VqEL037I39
        CK18L020 KC2018 06 07.04040 13 54 44.82 -41 58 23.7          16.6 RrEL037Y00
        CK18L020 KC2018 06 07.04182 13 54 44.70 -41 58 21.3          16.6 RrEL037Y00
        CK18L020 KC2018 06 07.04517 13 54 44.53 -41 58 15.8          16.0 RrEL037Y00
        CK18L020 KC2018 06 07.05406 13 54 44.26 -41 57 59.9          16.0 VqEL037I39
        CK18L020 KC2018 06 07.08954 13 54 42.62 -41 56 59.7          16.1 VqEL037I39
        CK18L020 KC2018 06 07.10244 13 54 41.96 -41 56 38.1          15.9 VqEL037I39
        CK18L020 KC2018 06 07.11903 13 54 41.20 -41 56 10.4          16.1 VqEL037I39
        CK18L020  C2018 06 07.36094 13 54 30.79 -41 49 23.1          17.0 VqEL037E23
        CK18L020  C2018 06 07.36719 13 54 30.49 -41 49 12.4          17.1 VqEL037E23
        CK18L020  C2018 06 07.37413 13 54 30.20 -41 49 01.1          17.1 VqEL037E23
        CK18L020  C2018 06 07.38038 13 54 29.85 -41 48 50.6          16.6 VqEL037E23
        CK18L020 `C2018 06 07.61844 13 54 18.95 -41 42 08.1          16.6 VqEL037Q62
        CK18L020 `C2018 06 07.62305 13 54 18.72 -41 42 00.6          16.6 VqEL037Q62
        CK18L020 `C2018 06 07.62769 13 54 18.53 -41 41 52.8          16.5 VqEL037Q62
        CK18L020 `C2018 06 07.64032 13 54 17.96 -41 41 30.8          16.3 VqEL037Q62
        CK18L020 2C2018 06 07.65719 13 54 17.23 -41 41 02.3          16.7  qEL037Q62
        CK18L020 2C2018 06 07.65872 13 54 17.24 -41 40 59.5          16.3  qEL037Q62
        CK18L020 2C2018 06 07.66022 13 54 17.14 -41 40 57.0          16.6  qEL037Q62
        CK18L020 2C2018 06 07.66190 13 54 17.06 -41 40 54.0          16.6  qEL037Q62
        CK18L020 KC2018 06 08.05379 13 54 00.45 -41 29 53.7          15.7 VqEL037I39
        CK18L020 KC2018 06 08.07026 13 53 59.69 -41 29 26.3          16.0 VqEL037I39
        CK18L020 KC2018 06 08.08673 13 53 59.00 -41 28 58.2          16.0 VqEL037I39
        CK18L020  C2018 06 08.36221 13 53 47.45 -41 21 11.1          16.9 GUEL037474
        CK18L020  C2018 06 08.36621 13 53 47.27 -41 21 04.5          16.4 GUEL037474
        CK18L020  C2018 06 08.37021 13 53 47.10 -41 20 57.7          16.4 GUEL037474
    
    Observer details:
    474 Mount John Observatory, Lake Tekapo.  Observers A. C. Gilmore,
        P. M. Kilmartin.  Measurer P. M. Kilmartin.  1.0-m f/7.7 reflector + CCD.
    807 Cerro Tololo.  Observers T. Linder, R. Holmes.  0.61-m f/10.0 astrograph
        + CCD.
    E23 Arcadia.  Observer A. Hidas.  0.35-m f/1.9 reflector + CCD.
    I39 Observatorio Cruz del Sur, San Justo.  Observer A. Chapman.  0.20-m f/4
        reflector + CCD.
    I47 Pierre Auger Observatory, Malargue.  Observer M. Masek.  0.3-m f/10
        reflector + CCD.
    Q62 iTelescope Observatory, Siding Spring.  Observers M. Urbanik, S. M. Tilley.
        0.4-m f/3.5 reflector + CCD, 0.70-m f/6.6 reflector + CCD.
    T08 ATLAS-MLO, Mauna Loa.  Observers L. Denneau, H. Flewelling, A. Heinze,
        H. Weiland, J. Tonry.  Measurers L. Denneau, H. Flewelling, A. Heinze,
        J. Tonry.  0.5-m f/2.0 Schmidt + CCD.
    W88 Slooh.com Chile Observatory, La Dehesa.  Observer B. Lutkenhoner.  0.35-m
        f/11 Schmidt-Cassegrain + CCD.
    X74 Observatorio Campo dos Amarais.  Observer L. S. Amaral.  Measurer
        P. R. Holvorcem.  0.31-m f/2.9 Newtonian reflector + CCD.
    Y00 SONEAR Observatory, Oliveira.  Observers C. Jacques, E. Pimentel,
        J. Barros.  Measurer C. Jacques.  0.45-m f/2.9 reflector + CCD.
    
    Orbital elements:
        C/2018 L2 (ATLAS)
    T 2018 Dec. 2.39688 TT                                  MPCW
    q   1.7177566            (2000.0)            P               Q
                       Peri.   55.98493     +0.02581876     +0.56687526
                       Node   242.90713     -0.89357649     +0.38235424
    e   1.0            Incl.   67.65137     +0.44816787     +0.72969698
    From 50 observations 2018 June 4-8.
    
    Ephemeris:
        C/2018 L2 (ATLAS)
    Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   m1    m2
    2018 05 10    14 28 34.1 -52 56 42   2.1885  3.0617   143.8    11.2  16.6
    ...
    2018 05 25    14 07 34.1 -47 42 29   2.0427  2.9240   144.1    11.7  16.2
    ...
    2018 06 02    13 58 59.6 -44 17 01   1.9946  2.8511   140.5    13.1  16.0
    ...
    2018 06 08    13 54 02.8 -41 31 26   1.9721  2.7968   136.5    14.5  15.9
    2018 06 09    13 53 21.1 -41 03 11   1.9695  2.7877   135.7    14.7  15.9
    2018 06 10    13 52 41.5 -40 34 47   1.9672  2.7787   134.9    15.0  15.9
    ...
    2018 06 16    13 49 31.1 -37 42 33   1.9598  2.7248   129.9    16.6  15.8
    ...
    2018 06 24    13 47 18.2 -33 52 43   1.9657  2.6535   122.4    18.9  15.7
    ...
    2018 07 09    13 48 45.0 -27 04 24   2.0174  2.5220   107.8    22.6  15.5
    
    Gareth V. Williams           (C) Copyright 2018 MPC           M.P.E.C. 2018-L37
    

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