MPEC 2018-H55 : COMET C/2018 EF9 (Lemmon)
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Read MPEC 2018-H54
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M.P.E.C. 2018-H55 Issued 2018 Apr. 20, 17:27 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 EF9 (Lemmon)
Originally announced on MEPC 2018-F138 as a minor planet, observations
reported by E. Kramer (on behalf of the NEOWISE team) from the NEOWISE
satellite on Apr. 7.55 UT through Apr. 8.14 UT showed the object to be
extended. Confirmation of the cometary nature was obtained on Apr. 14.19 UT
by M. Knight and J. Bauer (University of Maryland) using the 4-m Discovery
Channel Telescope. The object showed a 2".2-wide coma and a faint tail ~7"
long in P.A. 170 (approximately in the anti-sunward direction).
Observations:
CK18E09F* C2018 03 09.29782 13 48 47.77 +41 23 37.9 20.7 GUEH055G96
CK18E09F C2018 03 09.30302 13 48 47.70 +41 24 02.9 20.3 GUEH055G96
CK18E09F C2018 03 09.30823 13 48 47.77 +41 24 29.6 21.0 GUEH055G96
CK18E09F C2018 03 09.31345 13 48 47.80 +41 24 53.7 21.2 GUEH055G96
CK18E09F C2018 03 09.38352 13 48 48.06 +41 30 34.2 20.1 GUEH055G96
CK18E09F C2018 03 09.38472 13 48 48.00 +41 30 39.5 UEH055G96
CK18E09F C2018 03 09.38513 13 48 48.01 +41 30 42.0 UEH055G96
CK18E09F C2018 03 09.39403 13 48 48.04 +41 31 23.3 UEH055G96
CK18E09F C2018 03 09.39484 13 48 48.00 +41 31 26.9 20.9 GUEH055G96
CK18E09F C2018 03 09.39525 13 48 48.03 +41 31 30.7 20.6 GUEH055G96
CK18E09F C2018 03 09.42215913 48 48.02 +41 33 40.0 20.4 GUEH055H01
CK18E09F C2018 03 09.42595513 48 48.03 +41 33 58.2 20.2 GUEH055H01
CK18E09F C2018 03 09.43807713 48 48.05 +41 34 56.8 20.9 GUEH055H01
CK18E09F C2018 03 09.44628113 48 48.06 +41 35 36.3 20.5 GUEH055H01
CK18E09F C2018 03 10.25133 13 48 52.59 +42 40 21.0 21.9 GUEH055G96
CK18E09F C2018 03 10.25208 13 48 52.68 +42 40 24.9 22.0 GUEH055G96
CK18E09F C2018 03 10.25283 13 48 52.64 +42 40 28.2 20.8 GUEH055G96
CK18E09F KC2018 03 10.36513013 48 52.44 +42 49 31.7 21.1 VuEH055H21
CK18E09F KC2018 03 10.37668713 48 52.43 +42 50 27.2 21.5 VuEH055H21
CK18E09F KC2018 03 10.39131313 48 52.44 +42 51 37.8 21.1 VuEH055H21
CK18E09F C2018 03 10.52670 13 48 53.158+43 02 34.47 21.0 iUEH055F51
CK18E09F C2018 03 10.53858 13 48 53.110+43 03 31.43 21.1 iUEH055F51
CK18E09F C2018 03 13.00015 13 48 52.77 +46 21 09.9 20.5 VSEH055033
CK18E09F C2018 03 13.00355 13 48 52.75 +46 21 26.1 20.7 VSEH055033
CK18E09F C2018 03 13.00696 13 48 52.70 +46 21 42.6 20.6 VSEH055033
CK18E09F C2018 03 13.01037 13 48 52.69 +46 21 58.8 20.8 VSEH055033
CK18E09F C2018 03 13.01377 13 48 52.68 +46 22 15.3 20.7 VSEH055033
CK18E09F C2018 03 13.01719 13 48 52.62 +46 22 31.3 20.4 VSEH055033
CK18E09F C2018 03 13.47092 13 48 50.21 +46 58 49.8 20.1 GUEH055I52
CK18E09F C2018 03 13.47283 13 48 50.26 +46 58 59.2 20.5 GUEH055I52
CK18E09F C2018 03 13.47474 13 48 50.16 +46 59 07.0 20.4 GUEH055I52
CK18E09F C2018 03 13.47664 13 48 50.24 +46 59 17.6 20.4 GUEH055I52
CK18E09F KC2018 03 13.95100 13 48 48.11 +47 37 03.9 20.6 RoEH055K88
CK18E09F KC2018 03 13.95825 13 48 48.03 +47 37 39.2 19.9 RoEH055K88
CK18E09F C2018 03 15.06691 13 48 38.52 +49 05 39.6 21.9 VSEH055033
CK18E09F C2018 03 15.07031 13 48 38.50 +49 05 55.8 21.4 VSEH055033
CK18E09F C2018 03 15.07372 13 48 38.42 +49 06 12.1 21.0 VSEH055033
CK18E09F C2018 03 15.07713 13 48 38.37 +49 06 28.0 21.0 VSEH055033
CK18E09F C2018 03 15.08053 13 48 38.37 +49 06 44.0 21.4 VSEH055033
CK18E09F C2018 03 15.08394 13 48 38.29 +49 07 00.1 21.4 VSEH055033
CK18E09F C2018 03 15.08735 13 48 38.23 +49 07 16.2 21.5 VSEH055033
CK18E09F |C2018 03 15.44085 13 48 34.39 +49 35 13.4 vEH055H06
CK18E09F |C2018 03 15.44449 13 48 34.32 +49 35 30.2 vEH055H06
CK18E09F |C2018 03 15.44813 13 48 34.23 +49 35 47.2 19.3 wvEH055H06
CK18E09F C2018 03 16.31634 13 48 23.78 +50 43 58.0 20.1 GUEH055I52
CK18E09F C2018 03 16.32025 13 48 23.65 +50 44 17.4 UEH055I52
CK18E09F C2018 03 16.32416 13 48 23.56 +50 44 34.8 UEH055I52
CK18E09F C2018 03 16.32807 13 48 23.57 +50 44 53.0 20.4 GUEH055I52
CK18E09F 1C2018 03 16.34616 13 48 23.42 +50 46 16.8 EH055658
CK18E09F 1C2018 03 16.34765 13 48 23.40 +50 46 24.0 EH055658
CK18E09F 1C2018 03 16.34914 13 48 23.37 +50 46 31.1 EH055658
CK18E09F C2018 03 17.39773 13 48 06.06 +52 08 08.1 19.8 GUEH055I52
CK18E09F C2018 03 17.39897 13 48 06.03 +52 08 14.4 20.4 GUEH055I52
CK18E09F C2018 03 17.40168 13 48 05.93 +52 08 27.0 20.3 GUEH055I52
CK18E09F C2018 03 17.40292 13 48 05.84 +52 08 32.0 20.6 GUEH055I52
CK18E09F C2018 03 18.40294 13 47 45.91 +53 25 28.2 19.7 GUEH055I52
CK18E09F C2018 03 18.40459 13 47 45.86 +53 25 35.6 21.0 GUEH055I52
CK18E09F C2018 03 18.40625 13 47 45.84 +53 25 43.9 20.3 GUEH055I52
CK18E09F C2018 03 18.40790 13 47 45.81 +53 25 51.6 19.9 GUEH055I52
CK18E09F C2018 03 19.31442 13 47 24.86 +54 34 46.5 UEH055I52
CK18E09F C2018 03 19.31566 13 47 24.91 +54 34 52.7 UEH055I52
CK18E09F C2018 03 19.31690 13 47 24.73 +54 34 56.8 UEH055I52
CK18E09F C2018 03 19.31814 13 47 24.71 +54 35 03.0 21.2 GUEH055I52
CK18E09F SC2018 03 19.31866 13 47 24.73 +54 35 06.1 oEH055711
CK18E09F SC2018 03 19.32183 13 47 24.43 +54 35 21.5 oEH055711
CK18E09F SC2018 03 19.32511 13 47 24.45 +54 35 36.5 oEH055711
CK18E09F C2018 03 20.26228 13 46 59.28 +55 45 55.0 20.0 GUEH055I52
CK18E09F C2018 03 20.26352 13 46 59.15 +55 45 59.7 20.2 GUEH055I52
CK18E09F C2018 03 20.26476 13 46 59.11 +55 46 06.6 20.1 GUEH055I52
CK18E09F C2018 03 20.26600 13 46 59.00 +55 46 11.4 20.3 GUEH055I52
CK18E09F KC2018 03 20.35234 13 46 56.04 +55 52 39.1 oEH055711
CK18E09F KC2018 03 20.36017 13 46 55.77 +55 53 13.7 oEH055711
CK18E09F KC2018 03 21.35039 13 46 24.19 +57 06 22.6 oEH055711
CK18E09F KC2018 03 21.35363 13 46 24.09 +57 06 36.8 oEH055711
CK18E09F KC2018 03 21.35707 13 46 23.89 +57 06 52.1 oEH055711
CK18E09F C2018 03 22.28475 13 45 50.70 +58 14 15.4 19.9 GUEH055I52
CK18E09F C2018 03 22.28600 13 45 50.57 +58 14 21.8 19.7 GUEH055I52
CK18E09F C2018 03 22.28724 13 45 50.52 +58 14 26.5 19.1 GUEH055I52
CK18E09F C2018 03 22.29040 13 45 50.34 +58 14 40.3 20.3 GUEH055I52
CK18E09F KC2018 03 23.95855 13 44 39.05 +60 13 04.2 qEH055595
CK18E09F KC2018 03 23.96912 13 44 38.54 +60 13 49.2 19.7 VqEH055595
CK18E09F C2018 03 24.44243 13 44 15.09 +60 46 43.9 19.8 GUEH055I52
CK18E09F C2018 03 24.44769 13 44 14.70 +60 47 06.1 19.5 GUEH055I52
CK18E09F C2018 03 24.44894 13 44 14.61 +60 47 10.9 20.2 GUEH055I52
CK18E09F C2018 03 27.50476 13 41 15.77 +64 11 43.0 20.4 GUEH055I52
CK18E09F C2018 03 27.50827 13 41 15.39 +64 11 56.3 20.3 GUEH055I52
CK18E09F C2018 03 27.51518 13 41 14.90 +64 12 22.9 20.2 GUEH055I52
CK18E09F C2018 03 28.37144 13 40 14.28 +65 07 10.8 20.2 GUEH055I52
CK18E09F C2018 03 28.37392 13 40 14.62 +65 07 19.0 19.8 GUEH055I52
CK18E09F C2018 03 28.37516 13 40 14.60 +65 07 24.6 20.1 GUEH055I52
CK18E09F S2018 04 07.55714 13 19 51.69 +74 27 15.1 19 RLEH055C51
CK18E09F s2018 04 07.55714 1 + 404.0128 + 909.2191 + 6775.9706 EH055C51
CK18E09F S2018 04 07.68805 13 19 27.70 +74 33 21.2 LEH055C51
CK18E09F s2018 04 07.68805 1 + 406.1468 + 905.1751 + 6776.4012 EH055C51
CK18E09F S2018 04 07.75350 13 19 16.31 +74 36 22.5 LEH055C51
CK18E09F s2018 04 07.75350 1 + 407.1909 + 903.1933 + 6776.6109 EH055C51
CK18E09F S2018 04 07.81895 13 19 04.52 +74 39 24.4 LEH055C51
CK18E09F s2018 04 07.81895 1 + 408.2838 + 901.1646 + 6776.8239 EH055C51
CK18E09F S2018 04 07.88440 13 18 52.15 +74 42 24.8 LEH055C51
CK18E09F s2018 04 07.88440 1 + 409.3841 + 899.1353 + 6777.0346 EH055C51
CK18E09F S2018 04 07.94985 13 18 40.39 +74 45 26.1 LEH055C51
CK18E09F s2018 04 07.94985 1 + 410.4923 + 897.1074 + 6777.2452 EH055C51
CK18E09F S2018 04 08.08063 13 18 15.70 +74 51 24.7 LEH055C51
CK18E09F s2018 04 08.08063 1 + 357.9416 + 956.4332 + 6772.1130 EH055C51
CK18E09F S2018 04 08.08076 13 18 15.76 +74 51 26.6 LEH055C51
CK18E09F s2018 04 08.08076 1 + 412.6863 + 893.1041 + 6777.6569 EH055C51
CK18E09F S2018 04 08.14608 13 18 03.20 +74 54 26.5 LEH055C51
CK18E09F s2018 04 08.14608 1 + 358.9994 + 954.3535 + 6772.3593 EH055C51
CK18E09F C2018 04 14.18639 12 53 19.45 +79 00 50.0 LEH055G37
CK18E09F C2018 04 14.18897 12 53 18.57 +79 00 55.8 LEH055G37
Observer details:
033 Karl Schwarzschild Observatory, Tautenburg. Observers C. Hoegner,
B. Stecklum, U. Laux. Measurer B. Stecklum. 1.34-m f/3 Schmidt + CCD.
595 Farra d'Isonzo. Observers E. Pettarin, F. Piani. Measurer E. Pettarin.
0.61-m f/4.0 reflector + CCD.
658 National Research Council of Canada. Observer D. D. Balam. 1.82-m
Plaskett telescope + CCD.
711 McDonald Observatory. Observer J. G. Ries. 2.1-m reflector + CCD + focal
reducer.
C51 WISE. 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.
F51 Pan-STARRS 1, Haleakala. Observers J. Bulger, T. Lowe, A. Schultz,
M. Willman. Measurers K. Chambers, S. Chastel, L. Denneau, H. Flewelling,
M. Huber, E. Magnier, Y. Ramanjooloo, R. Wainscoat, C. Waters, R. Weryk.
1.8-m Ritchey-Chretien + CCD.
G37 Lowell Observatory-Discovery Channel Telescope. Observers M. M. Knight,
J. M. Bauer. 4.3-m reflector + CCD.
G96 Mt. Lemmon Survey. Observer A. R. Gibbs. 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.
1.5-m reflector + 10K CCD.
H01 Magdalena Ridge Observatory, Socorro. Observers W. H. Ryan, E. V. Ryan.
Measurer W. H. Ryan. 2.4-m f/8.9 reflector + 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.
I52 Steward Observatory, Mt. Lemmon Station. Observers D. C. Fuls,
B. M. Africano, G. J. Leonard, R. A. Kowalski, E. J. Christensen.
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.
K88 GINOP-KHK, Piszkesteto. Observer K. Sarneczky. 0.60-m Schmidt + CCD.
Orbital elements:
C/2018 EF9 (Lemmon)
Epoch 2018 June 11.0 TT = JDT 2458280.5
T 2018 May 23.08772 TT MPCW
q 1.5570278 (2000.0) P Q
z +0.0009547 Peri. 72.59104 -0.30804919 +0.94264994
+/-0.0002108 Node 172.58426 -0.42259717 -0.25660882
e 0.9985134 Incl. 84.70671 +0.85235986 +0.21345490
From 98 observations 2018 Mar. 9-Apr. 14, mean residual 0".5.
C/2018 EF9 (Lemmon)
Epoch 2018 Mar. 23.0 TT = JDT 2458200.5
T 2018 May 23.08522 TT MPCW
q 1.5570341 (2000.0) P Q
z +0.0009565 Peri. 72.58915 -0.30807900 +0.94264124
+/-0.0002108 Node 172.58470 -0.42258489 -0.25661414
e 0.9985106 Incl. 84.70712 +0.85235517 +0.21348695
From 98 observations 2018 Mar. 9-Apr. 14, mean residual 0".5.
Ephemeris:
C/2018 EF9 (Lemmon)
Date TT R. A. (2000) Decl. Delta r Elong. Phase m1 m2
2018 03 21 13 46 35.7 +56 40 30 1.0631 1.7782 119.4 29.2 20.7
...
2018 04 05 13 26 45.8 +72 22 39 1.1765 1.6903 101.6 35.4 20.9
...
2018 04 13 12 59 12.2 +78 17 00 1.2640 1.6512 92.8 37.3 21.1
...
2018 04 19 12 22 28.8 +81 35 10 1.3345 1.6258 86.9 38.1 21.2
2018 04 20 12 14 24.3 +82 02 35 1.3464 1.6220 85.9 38.2 21.2
2018 04 21 12 05 39.5 +82 28 22 1.3583 1.6182 85.0 38.2 21.2
...
2018 04 27 10 57 25.6 +84 27 52 1.4292 1.5978 79.9 38.3 21.3
...
2018 05 05 08 54 39.4 +85 31 49 1.5196 1.5768 74.1 38.0 21.4
...
2018 05 20 06 16 11.5 +84 46 59 1.6645 1.5576 66.0 36.4 21.6
Gareth V. Williams (C) Copyright 2018 MPC M.P.E.C. 2018-H55
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