[Iaude] MPEC L53: COMET C/2018 EN4 (NEOWISE)

mpec at mpcdb1.cfa.harvard.edu mpec at mpcdb1.cfa.harvard.edu
Mon Jun 11 12:15:17 EDT 2018


M.P.E.C. 2018-L53                                Issued 2018 June 11, 14:52 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/2018 EN4 (NEOWISE)

     H. Sato (H06) reported a round 10" coma on twelve stacked 60 s images on
May 14, with a fan-like 20" tail in P.A. 90-135.  Sato also reported cometary
features in images on May 13 (U69), showing a 10" coma in four stacked 60 s
images, and May 15 (H06), showing a 15" coma and a 15" tail in P.A. 90-170 in
twelve stacked 60 s images.  M. Jaeger (A71) reported a 15" coma in images
obtained on June 4.  Sato (H06) noted a 30" coma in stacked 60-s images
obtained on June 1 and 3.  L. Buzzi (204) noted a 10" coma, but no tail, in
images obtained on June 9.
 
Observations:
    CK18E04N* S2018 03 09.08775 06 34 15.16 -11 44 43.0          20   RLEL053C51
    CK18E04N  s2018 03 09.08775 1 - 1396.2275 + 6571.9957 - 1397.3229   EL053C51
    CK18E04N  S2018 03 09.15320 06 34 12.44 -11 40 59.7                LEL053C51
    CK18E04N  s2018 03 09.15320 1 - 1403.5464 + 6570.8187 - 1395.4670   EL053C51
    CK18E04N  S2018 03 09.21865 06 34 09.78 -11 37 16.2                LEL053C51
    CK18E04N  s2018 03 09.21865 1 - 1410.8638 + 6569.6288 - 1393.6111   EL053C51
    CK18E04N  S2018 03 09.41552 06 34 02.04 -11 26 04.1                LEL053C51
    CK18E04N  s2018 03 09.41552 1 - 1401.5566 + 6632.9643 - 1060.8598   EL053C51
    CK18E04N  S2018 03 09.67733 06 33 51.52 -11 11 10.5                LEL053C51
    CK18E04N  s2018 03 09.67733 1 - 1431.0217 + 6627.8197 - 1053.2689   EL053C51
    CK18E04N |C2018 03 13.01507 06 31 56.93 -08 01 36.2          20.0 GUEL053807
    CK18E04N |C2018 03 13.01816 06 31 56.82 -08 01 25.7          20.4 GUEL053807
    CK18E04N |C2018 03 13.02756 06 31 56.52 -08 00 54.0          20.0 GUEL053807
    CK18E04N HC2018 03 13.17248 06 31 52.25 -07 52 49.9                oEL053691
    CK18E04N HC2018 03 13.18366 06 31 51.93 -07 52 11.0                oEL053691
    CK18E04N HC2018 03 13.19488 06 31 51.48 -07 51 32.9                oEL053691
    CK18E04N HC2018 03 13.80208 06 31 34.50 -07 17 16.8          20.5 GUEL053204
    CK18E04N KC2018 03 13.82381 06 31 33.82 -07 16 02.7                UEL053204
    CK18E04N KC2018 03 14.10424906 31 26.23 -07 00 14.3          20.6 VuEL053H21
    CK18E04N KC2018 03 14.10813706 31 26.10 -07 00 01.0          20.5 VuEL053H21
    CK18E04N KC2018 03 14.11188506 31 26.00 -06 59 48.5          20.5 VuEL053H21
    CK18E04N  C2018 03 14.20350 06 31 23.40 -06 54 38.1                UEL053I52
    CK18E04N  C2018 03 14.20784 06 31 23.37 -06 54 23.3                UEL053I52
    CK18E04N  C2018 03 14.20860 06 31 23.37 -06 54 21.0                UEL053I52
    CK18E04N  C2018 03 14.21848 06 31 23.07 -06 53 47.0                UEL053I52
    CK18E04N 1C2018 03 15.44510 06 30 53.05 -05 44 45.7                vEL053Q62
    CK18E04N 1C2018 03 15.44734 06 30 52.99 -05 44 38.2                vEL053Q62
    CK18E04N 1C2018 03 15.44958 06 30 52.92 -05 44 30.6          20.8 wvEL053Q62
    CK18E04N KC2018 03 16.36664 06 30 33.14 -04 53 13.3                UEL053474
    CK18E04N KC2018 03 16.36875 06 30 33.13 -04 53 07.1          20.6 RUEL053474
    CK18E04N KC2018 03 16.37086 06 30 33.12 -04 52 59.5          20.3 RUEL053474
    CK18E04N 4C2018 03 17.00094 06 30 20.88 -04 17 56.6          20.4 GUEL053I11
    CK18E04N 4C2018 03 17.00171 06 30 20.86 -04 17 54.1          20.2 GUEL053I11
    CK18E04N 4C2018 03 17.00249 06 30 20.85 -04 17 51.4          20.4 GUEL053I11
    CK18E04N 4C2018 03 17.00326 06 30 20.82 -04 17 48.8          20.4 GUEL053I11
    CK18E04N _C2018 03 22.28857606 29 18.747+00 30 32.37         20.6 GUEL053568
    CK18E04N _C2018 03 22.28976206 29 18.738+00 30 36.20         20.6 GUEL053568
    CK18E04N _C2018 03 22.29093706 29 18.728+00 30 39.96         20.5 GUEL053568
    CK18E04N _C2018 03 22.29212206 29 18.721+00 30 43.77         20.4 GUEL053568
    CK18E04N 5C2018 05 13.18036 07 09 45.70 +34 41 40.5                vEL053U69
    CK18E04N 5C2018 05 13.18227 07 09 45.85 +34 41 43.2          18.5 wvEL053U69
    CK18E04N |C2018 05 14.14257 07 11 13.62 +35 08 10.9                vEL053H06
    CK18E04N |C2018 05 14.14499 07 11 13.82 +35 08 14.7                vEL053H06
    CK18E04N |C2018 05 14.14741 07 11 14.01 +35 08 18.4          18.0 wvEL053H06
    CK18E04N 9C2018 05 15.88118 07 13 56.22 +35 55 19.7          19.0 VUEL053G40
    CK18E04N 9C2018 05 15.89218 07 13 57.24 +35 55 37.9          18.9 VUEL053G40
    CK18E04N 9C2018 05 15.90305 07 13 58.24 +35 55 56.0          19.0 VUEL053G40
    CK18E04N |C2018 05 17.13272 07 15 56.33 +36 28 42.7                vEL053H06
    CK18E04N |C2018 05 17.13591 07 15 56.63 +36 28 47.8          18.5 wvEL053H06
    CK18E04N _C2018 05 17.24411807 16 07.108+36 31 40.94         20.1 GVEL053568
    CK18E04N _C2018 05 17.24599407 16 07.287+36 31 43.83         20.1 GVEL053568
    CK18E04N |C2018 06 01.14929 07 43 23.85 +42 35 42.4                vEL053H06
    CK18E04N |C2018 06 01.15128 07 43 24.07 +42 35 44.9                vEL053H06
    CK18E04N |C2018 06 01.15328 07 43 24.32 +42 35 47.6          17.8 wvEL053H06
    CK18E04N |C2018 06 03.14906 07 47 33.96 +43 20 23.2                vEL053H06
    CK18E04N |C2018 06 03.15149 07 47 34.25 +43 20 26.6                vEL053H06
    CK18E04N |C2018 06 03.15392 07 47 34.61 +43 20 30.0          17.4 wvEL053H06
    CK18E04N KC2018 06 04.88801 07 51 18.00 +43 58 28.5          19.0 VqEL053A71
    CK18E04N KC2018 06 04.89422 07 51 18.79 +43 58 36.6          18.6 VqEL053A71
    CK18E04N 9C2018 06 05.90501 07 53 31.69 +44 20 28.9          18.3 VUEL053G40
    CK18E04N 9C2018 06 05.91201 07 53 32.67 +44 20 37.9          18.2 VUEL053G40
    CK18E04N 9C2018 06 05.91890 07 53 33.63 +44 20 47.0          18.2 VUEL053G40
    CK18E04N KC2018 06 09.89515 08 02 37.88 +45 44 32.1                VEL053204
    CK18E04N KC2018 06 09.89993 08 02 38.54 +45 44 38.0          19.0 GVEL053204
    CK18E04N KC2018 06 09.90689 08 02 39.55 +45 44 46.8                VEL053204
 
Observer details:
204 Schiaparelli Observatory.  Observer L. Buzzi.  0.84-m f/3.5 reflector +
    CCD.
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.
568 Mauna Kea.  Observers K. Meech, J. Kleyna, D. Woodworth, L. Wells.
    Measurers M. Micheli, J. Kleyna.  3.6-m Canada-France-Hawaii Telescope +
    CCD.
691 Steward Observatory, Kitt Peak-Spacewatch.  Observer J. V. Scotti.  0.9-m
    f/3 reflector + CCD.
807 Cerro Tololo Observatory, La Serena.  Observers T. Linder, R. Holmes.
    1.00-m f/10.0 astrograph + CCD.
A71 Stixendorf.  Observers M. Jaeger, E. Prosperi, S. Prosperi, W. Vollmann.
    Measurer M. Jaeger.  0.3-m f/4 reflector + CCD.
C51 WISE.  Observer Near-Earth Object Wide-field Infrared Survey Explorer.
    Measurers A. K. Mainzer, J. M. Bauer, T. Grav, J. R. Masiero,
    J. W. Dailey, R. M. Cutri, E. L. Wright, C. Nugent, S. Sonnett, E. Kramer.
G40 Slooh.com Canary Islands Observatory.  Observer B. Lutkenhoner.  0.5-m
    f/6.8 Corrected Dall-Kirkham + CCD.
H06 iTelescope Observatory, Mayhill.  Observer H. Sato.  0.43-m f/6.8
    astrograph + CCD + f/4.5 focal reducer.
H21 Astronomical Research Observatory, Westfield.  Observer R. Holmes.
    Measurers S. Foglia, L. Buzzi, T. Linder, R. Holmes.  0.61-m f/4.5
    astrograph + CCD.
I11 Gemini South Observatory, Cerro Pachon.  Observers J. Masiero, J. Chavez,
    M. Gomez.  Measurer J. Masiero.  8.0-m reflector.
I52 Steward Observatory, Mt. Lemmon Station.  Observer D. C. Fuls.  Measurers
    B. M. Africano, E. J. Christensen, D. C. Fuls, A. R. Gibbs, A. D. Grauer,
    J. A. Johnson, R. A. Kowalski, S. M. Larson, G. J. Leonard, R. L. Seaman,
    F. C. Shelly.  1.0-m reflector + CCD.
Q62 iTelescope Observatory, Siding Spring.  Observer H. Sato.  0.51-m f/6.8
    astrograph + CCD + f/4.5 focal reducer.
U69 iTelescope SRO Observatory, Auberry.  Observer H. Sato.  0.61-m f/6.5
    astrograph + CCD.
 
Orbital elements:
    C/2018 EN4 (NEOWISE)
Epoch 2018 June 11.0 TT = JDT 2458280.5
T 2018 June 7.78136 TT                                  MPCW
q   1.4479234            (2000.0)            P               Q
n   0.01247109     Peri.   35.01391     -0.64910245     +0.33065309
a  18.4161880      Node   136.16554     +0.23893593     -0.76638990
e   0.9213777      Incl.   81.56186     +0.72220193     +0.55074046
P  79.03
>From 58 observations 2018 Mar. 9-June 9, mean residual 0".4.

    C/2018 EN4 (NEOWISE)
Epoch 2094 Feb. 12.0 TT = JDT 2485920.5
T 2094 Feb. 14.17360 TT                                 MPCW
q   1.4563747            (2000.0)            P               Q
n   0.01284948     Peri.   34.89517     -0.64560538     +0.33218866
a  18.0528502      Node   136.01841     +0.24454851     -0.76308946
e   0.9193272      Incl.   81.98091     +0.72345678     +0.55438720
P  76.70
>From 58 observations 2018 Mar. 9-June 9, mean residual 0".4.

    C/2018 EN4 (NEOWISE)
Epoch 2018 Mar. 23.0 TT = JDT 2458200.5
T 2018 June 7.77930 TT                                  MPCW
q   1.4479347            (2000.0)            P               Q
n   0.01247350     Peri.   35.01203     -0.64911513     +0.33062802
a  18.4138181      Node   136.16548     +0.23895959     -0.76638527
e   0.9213670      Incl.   81.56152     +0.72218271     +0.55076195
P  79.02
>From 58 observations 2018 Mar. 9-June 9, mean residual 0".4.

Ephemeris:
    C/2018 EN4 (NEOWISE)
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   m1    m2
2018 05 12    07 08 00.1 +34 08 45   1.8403  1.4936    54.2    33.3  18.1  20.9
...
2018 05 27    07 33 14.7 +40 36 21   1.9616  1.4569    46.2    30.1  18.1  20.9
...
2018 06 04    07 49 23.0 +43 39 08   2.0131  1.4489    43.1    28.6  18.1  20.9
...
2018 06 10    08 02 52.8 +45 46 44   2.0452  1.4482    41.4    27.6  18.2  20.9
2018 06 11    08 05 15.4 +46 07 15   2.0499  1.4486    41.1    27.5  18.2  20.9
2018 06 12    08 07 40.2 +46 27 33   2.0546  1.4491    40.9    27.3  18.2  20.9
...
2018 06 18    08 22 58.6 +48 24 55   2.0789  1.4547    40.0    26.7  18.2  20.9
...
2018 06 26    08 45 46.9 +50 49 23   2.1025  1.4693    39.6    26.1  18.3  20.9
...
2018 07 11    09 37 12.7 +54 37 20   2.1232  1.5173    41.4    26.3  18.4  21.0

Gareth V. Williams           (C) Copyright 2018 MPC           M.P.E.C. 2018-L53



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