MPEC 2018-W42 : COMET C/2018 U1 (Lemmon)
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M.P.E.C. 2018-W42 Issued 2018 Nov. 20, 14:44 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 U1 (Lemmon)
This object was reported as a new NEO and was moved to the PCCP when the
orbit looked cometary. Early reports from some observers using small
telescopes implied that the object was, in fact, a comet, but these reports
were not confirmed at the time by observers using large telescopes. Responding
to a query from the MPC, W. Ryan (H01, 2.4-m reflector) remarked that his
Oct. 27 images showed a subtle cometary appearance, and that the Nov. 19 images
had a PSF ~ 1.5 times that of field stars and a slightly elongated coma or tail
in P.A. 35.
Observations:
CK18U010* C2018 10 27.18558 19 15 18.62 +52 24 47.3 20.0 GVEW042G96
CK18U010 C2018 10 27.19084 19 15 18.60 +52 24 45.0 20.0 GVEW042G96
CK18U010 C2018 10 27.19612 19 15 18.62 +52 24 42.0 20.0 GVEW042G96
CK18U010 C2018 10 27.24030 19 15 18.84 +52 24 21.2 20.2 GVEW042G96
CK18U010 C2018 10 27.24217719 15 18.79 +52 24 20.3 20.9 GVEW042H01
CK18U010 C2018 10 27.24584 19 15 18.94 +52 24 18.7 19.9 GVEW042G96
CK18U010 C2018 10 27.24967519 15 18.87 +52 24 16.8 20.0 GVEW042H01
CK18U010 C2018 10 27.25232 19 15 18.89 +52 24 15.4 20.6 GVEW042G96
CK18U010 C2018 10 27.25735119 15 18.91 +52 24 13.3 20.1 GVEW042H01
CK18U010 C2018 10 27.25850 19 15 18.82 +52 24 12.5 20.8 GVEW042G96
CK18U010 C2018 10 27.26508119 15 18.84 +52 24 09.5 20.0 GVEW042H01
CK18U010 C2018 10 27.26966319 15 18.89 +52 24 07.2 20.0 GVEW042H01
CK18U010 C2018 10 27.27856819 15 18.91 +52 24 03.2 19.9 GVEW042H01
CK18U010 C2018 10 28.09972 19 15 21.95 +52 17 42.0 VEW042I52
CK18U010 C2018 10 28.10682 19 15 22.03 +52 17 38.5 20.5 GVEW042I52
CK18U010 C2018 10 28.10829319 15 21.95 +52 17 37.6 20.2 GVEW042H01
CK18U010 C2018 10 28.11387 19 15 22.00 +52 17 35.2 20.5 GVEW042I52
CK18U010 C2018 10 28.11520419 15 21.96 +52 17 34.4 19.9 GVEW042H01
CK18U010 C2018 10 28.12247 19 15 22.01 +52 17 30.8 VEW042I52
CK18U010 C2018 10 28.13058419 15 22.01 +52 17 27.2 20.4 GVEW042H01
CK18U010 C2018 10 28.13571719 15 22.06 +52 17 24.9 19.9 GVEW042H01
CK18U010 KC2018 10 28.79819419 15 24.82 +52 12 17.6 VEW042J95
CK18U010 KC2018 10 28.80639519 15 24.84 +52 12 13.8 VEW042J95
CK18U010 KC2018 10 28.81402119 15 24.94 +52 12 10.0 20.1 GVEW042J95
CK18U010 KC2018 10 29.03041 19 15 25.87 +52 10 30.4 20.3 GUEW042734
CK18U010 KC2018 10 29.04618 19 15 25.93 +52 10 23.2 20.0 GUEW042734
CK18U010 KC2018 10 29.05405 19 15 25.96 +52 10 19.5 20.1 GUEW042734
CK18U010 |C2018 10 29.05975 19 15 26.03 +52 10 17.1 VEW042H06
CK18U010 |C2018 10 29.06368 19 15 26.05 +52 10 15.1 VEW042H06
CK18U010 |C2018 10 29.06761 19 15 26.05 +52 10 13.2 19.9 GVEW042H06
CK18U010 C2018 10 29.06888 19 15 26.06 +52 10 12.6 20.2 GVEW042I52
CK18U010 C2018 10 29.07617 19 15 26.05 +52 10 09.3 20.0 GVEW042I52
CK18U010 C2018 10 29.08306 19 15 26.08 +52 10 05.8 20.0 GVEW042I52
CK18U010 C2018 10 29.08999 19 15 26.15 +52 10 03.0 19.9 GVEW042I52
CK18U010 C2018 10 30.16751 19 15 31.31 +52 01 44.9 VEW042I52
CK18U010 C2018 10 30.17404 19 15 31.34 +52 01 42.0 VEW042I52
CK18U010 C2018 10 30.18144 19 15 31.45 +52 01 39.4 20.0 GVEW042I52
CK18U010 KC2018 10 30.70901 19 15 34.28 +51 57 36.6 VEW042118
CK18U010 KC2018 10 30.71942 19 15 34.40 +51 57 31.7 VEW042118
CK18U010 KC2018 10 30.72982 19 15 34.50 +51 57 27.3 VEW042118
CK18U010 KC2018 10 30.73548619 15 34.37 +51 57 24.6 19.7 RVEW042K63
CK18U010 KC2018 10 30.74022 19 15 34.56 +51 57 22.4 VEW042118
CK18U010 KC2018 10 30.75157419 15 34.47 +51 57 17.3 19.9 RVEW042K63
CK18U010 KC2018 10 30.76208319 15 34.56 +51 57 12.0 19.8 RVEW042K63
CK18U010 KC2018 10 30.77948919 15 34.75 +51 57 04.7 20.2 GVEW042J95
CK18U010 KC2018 10 30.80607319 15 34.88 +51 56 52.7 20.2 GVEW042J95
CK18U010 KC2018 10 30.83000019 15 35.02 +51 56 41.7 20.1 GVEW042J95
CK18U010 IC2018 10 31.76081819 15 40.57 +51 49 35.5 20.4 GVEW042L01
CK18U010 IC2018 10 31.76393819 15 40.61 +51 49 33.8 20.6 GVEW042L01
CK18U010 KC2018 10 31.76861319 15 40.60 +51 49 32.3 20.4 GVEW042L01
CK18U010 KC2018 10 31.77250919 15 40.65 +51 49 30.8 20.5 GVEW042L01
CK18U010 (C2018 10 31.83065 19 15 41.00 +51 49 04.0 19.8 RUEW042G40
CK18U010 C2018 10 31.83589 19 15 40.97 +51 49 00.8 19.8 R EW042954
CK18U010 C2018 10 31.84093 19 15 41.02 +51 48 58.2 20.9 R EW042954
CK18U010 C2018 10 31.84260 19 15 41.05 +51 48 57.4 20.1 R EW042954
CK18U010 C2018 10 31.84428 19 15 41.08 +51 48 56.8 20 R EW042954
CK18U010 (C2018 10 31.84506 19 15 41.09 +51 48 57.7 19.9 RUEW042G40
CK18U010 C2018 10 31.84597 19 15 41.09 +51 48 56.1 20.3 R EW042954
CK18U010 C2018 11 01.06962 19 15 42.56 +51 47 15.6 20.3 GVEW042I52
CK18U010 C2018 11 01.07039 19 15 42.56 +51 47 15.1 20.3 GVEW042I52
CK18U010 C2018 11 01.07334 19 15 42.61 +51 47 13.6 20.3 GVEW042I52
CK18U010 C2018 11 01.07410 19 15 42.58 +51 47 13.3 20.3 GVEW042I52
CK18U010 C2018 11 01.07754 19 15 42.62 +51 47 12.0 20.6 GVEW042I52
CK18U010 C2018 11 01.07830 19 15 42.61 +51 47 11.4 20.1 GVEW042I52
CK18U010 C2018 11 01.08140 19 15 42.63 +51 47 09.9 20.0 GVEW042I52
CK18U010 C2018 11 01.08216 19 15 42.62 +51 47 09.8 20.2 GVEW042I52
CK18U010 KC2018 11 01.76029 19 15 47.14 +51 42 02.3 19.8 RqEW042215
CK18U010 KC2018 11 01.76287 19 15 47.27 +51 42 00.4 20.2 RqEW042215
CK18U010 KC2018 11 01.76609 19 15 47.26 +51 41 58.5 20.2 RqEW042215
CK18U010 C2018 11 02.07134 19 15 49.35 +51 39 40.8 20.5 GVEW042I52
CK18U010 C2018 11 02.07756 19 15 49.42 +51 39 37.9 19.9 GVEW042I52
CK18U010 C2018 11 02.08448 19 15 49.44 +51 39 34.5 20.2 GVEW042I52
CK18U010 C2018 11 02.09210 19 15 49.50 +51 39 30.8 20.1 GVEW042I52
CK18U010 C2018 11 03.07125 19 15 57.06 +51 32 09.9 VEW042I52
CK18U010 C2018 11 03.08728 19 15 56.94 +51 32 01.5 VEW042I52
CK18U010 C2018 11 03.09742 19 15 56.95 +51 31 56.9 20.1 GVEW042I52
CK18U010 KC2018 11 04.76519 19 16 10.70 +51 19 30.2 19.3 RoEW042K88
CK18U010 KC2018 11 04.77169 19 16 10.80 +51 19 27.9 19.6 RoEW042K88
CK18U010 KC2018 11 04.77818 19 16 10.85 +51 19 24.7 19.7 RoEW042K88
CK18U010 KC2018 11 05.74600 19 16 19.61 +51 12 14.7 19.8 RoEW042K88
CK18U010 KC2018 11 05.75088 19 16 19.65 +51 12 12.5 19.5 RoEW042K88
CK18U010 KC2018 11 05.75578 19 16 19.69 +51 12 10.5 19.5 RoEW042K88
CK18U010 KC2018 11 05.76075 19 16 19.74 +51 12 08.6 19.4 RoEW042K88
CK18U010 KC2018 11 06.05131 19 16 22.52 +51 10 00.4 oEW042711
CK18U010 KC2018 11 06.05446 19 16 22.52 +51 09 58.9 oEW042711
CK18U010 KC2018 11 06.05761 19 16 22.57 +51 09 57.7 oEW042711
CK18U010 KC2018 11 06.06153 19 16 22.62 +51 09 55.2 20.0 GUEW042H36
CK18U010 KC2018 11 06.07322 19 16 22.75 +51 09 50.1 19.9 GUEW042H36
CK18U010 C2018 11 06.12048 19 16 23.12 +51 09 29.0 20.2 GVEW042I52
CK18U010 C2018 11 06.12726 19 16 23.21 +51 09 26.4 20.4 GVEW042I52
CK18U010 C2018 11 06.14343 19 16 23.35 +51 09 19.2 20.3 GVEW042I52
CK18U010 C2018 11 06.15641 19 16 23.43 +51 09 12.7 20.3 GVEW042I52
CK18U010 C2018 11 06.81796819 16 29.950+51 04 21.93 20.1 GVEW042J04
CK18U010 C2018 11 06.81906919 16 29.954+51 04 21.55 20.0 GVEW042J04
CK18U010 C2018 11 06.82017019 16 29.974+51 04 21.19 20.0 GVEW042J04
CK18U010 KC2018 11 07.04888 19 16 32.31 +51 02 41.0 oEW042711
CK18U010 KC2018 11 07.05205 19 16 32.35 +51 02 39.6 oEW042711
CK18U010 KC2018 11 07.05523 19 16 32.38 +51 02 38.3 oEW042711
CK18U010 C2018 11 07.09211 19 16 32.69 +51 02 21.5 20.2 GVEW042I52
CK18U010 C2018 11 07.10099 19 16 32.79 +51 02 17.8 20.1 GVEW042I52
CK18U010 C2018 11 07.11400 19 16 32.96 +51 02 11.8 20.3 GVEW042I52
CK18U010 C2018 11 07.12142 19 16 32.99 +51 02 09.0 20.4 GVEW042I52
CK18U010 C2018 11 07.40748 19 16 35.99 +51 00 04.4 20.4 RrEW042P93
CK18U010 C2018 11 07.41556 19 16 36.02 +51 00 00.5 20.1 RrEW042P93
CK18U010 C2018 11 07.42363 19 16 36.14 +50 59 56.7 20.2 RrEW042P93
CK18U010 C2018 11 07.43171 19 16 36.21 +50 59 53.1 20.4 RrEW042P93
CK18U010 KC2018 11 07.74404 19 16 39.45 +50 57 36.7 19.6 RoEW042K88
CK18U010 KC2018 11 07.74890 19 16 39.55 +50 57 34.8 19.7 RoEW042K88
CK18U010 KC2018 11 07.75375 19 16 39.58 +50 57 32.7 19.6 RoEW042K88
CK18U010 KC2018 11 08.04248 19 16 42.59 +50 55 27.2 oEW042711
CK18U010 KC2018 11 08.04589 19 16 42.64 +50 55 25.5 oEW042711
CK18U010 KC2018 11 08.04936 19 16 42.67 +50 55 24.1 oEW042711
CK18U010 C2018 11 08.07780 19 16 42.97 +50 55 11.0 20.2 GVEW042I52
CK18U010 C2018 11 08.08704 19 16 43.10 +50 55 07.1 19.8 GVEW042I52
CK18U010 C2018 11 08.09474 19 16 43.15 +50 55 03.6 20.1 GVEW042I52
CK18U010 C2018 11 08.10213 19 16 43.23 +50 55 00.4 20.3 GVEW042I52
CK18U010 1C2018 11 08.14550919 16 43.71 +50 54 41.5 LEW042658
CK18U010 1C2018 11 08.14935219 16 43.75 +50 54 39.8 LEW042658
CK18U010 1C2018 11 08.15322919 16 43.79 +50 54 38.0 LEW042658
CK18U010 KC2018 11 09.03651 19 16 53.49 +50 48 15.6 oEW042711
CK18U010 KC2018 11 09.04013 19 16 53.50 +50 48 14.0 oEW042711
CK18U010 KC2018 11 09.04372 19 16 53.55 +50 48 12.3 oEW042711
CK18U010 C2018 11 09.09773 19 16 54.23 +50 47 48.6 20.3 GVEW042I52
CK18U010 C2018 11 09.10513 19 16 54.30 +50 47 45.5 19.6 GVEW042I52
CK18U010 C2018 11 09.11235 19 16 54.34 +50 47 42.3 19.9 GVEW042I52
CK18U010 C2018 11 09.11875 19 16 54.42 +50 47 39.5 19.8 GVEW042I52
CK18U010 C2018 11 12.08078 19 17 30.25 +50 26 35.1 20.5 GVEW042I52
CK18U010 C2018 11 12.08778 19 17 30.38 +50 26 31.9 20.0 GVEW042I52
CK18U010 C2018 11 12.09846 19 17 30.50 +50 26 28.1 20.1 GVEW042I52
CK18U010 C2018 11 12.10555 19 17 30.62 +50 26 24.9 20.0 GVEW042I52
CK18U010 KC2018 11 15.79849 19 18 21.94 +50 00 52.8 19.5 RqEW042104
CK18U010 C2018 11 15.80422 19 18 21.95 +50 00 50.6 20.0 VSEW042033
CK18U010 C2018 11 15.80674 19 18 21.98 +50 00 49.5 20.0 VSEW042033
CK18U010 C2018 11 15.80926 19 18 22.00 +50 00 48.4 19.9 VSEW042033
CK18U010 KC2018 11 15.80965 19 18 21.96 +50 00 48.7 20.2 RqEW042104
CK18U010 KC2018 11 15.82266 19 18 22.18 +50 00 44.1 qEW042104
CK18U010 C2018 11 16.07578 19 18 25.98 +49 59 00.6 19.9 GVEW042I52
CK18U010 C2018 11 16.08302 19 18 26.06 +49 58 57.2 20.1 GVEW042I52
CK18U010 C2018 11 16.09100 19 18 26.19 +49 58 54.0 20.1 GVEW042I52
CK18U010 C2018 11 16.09776 19 18 26.32 +49 58 51.1 19.9 GVEW042I52
CK18U010 KC2018 11 17.05646 19 18 41.01 +49 52 24.1 18.6 GUEW042734
CK18U010 KC2018 11 17.06461 19 18 40.98 +49 52 20.5 19.1 GUEW042734
CK18U010 1C2018 11 17.06927 19 18 41.09 +49 52 17.7 LEW042658
CK18U010 1C2018 11 17.07361 19 18 41.15 +49 52 16.0 LEW042658
CK18U010 1C2018 11 17.07796 19 18 41.23 +49 52 14.4 LEW042658
CK18U010 1C2018 11 17.08124 19 18 41.28 +49 52 13.0 LEW042658
CK18U010 KC2018 11 18.74825419 19 07.66 +49 41 07.5 20.8 GVEW042C95
CK18U010 KC2018 11 18.76568019 19 07.93 +49 41 00.7 20.5 GVEW042C95
CK18U010 C2018 11 19.06516 19 19 12.79 +49 39 02.3 20.0 GVEW042I52
CK18U010 C2018 11 19.07082 19 19 12.86 +49 39 00.0 19.8 GVEW042H01
CK18U010 C2018 11 19.07431 19 19 12.92 +49 38 59.6 19.9 GVEW042I52
CK18U010 C2018 11 19.07762 19 19 12.97 +49 38 57.2 20.1 GVEW042H01
CK18U010 C2018 11 19.08172 19 19 13.13 +49 38 55.4 19.3 GVEW042I52
CK18U010 C2018 11 19.09238 19 19 13.20 +49 38 51.3 19.9 GVEW042H01
CK18U010 C2018 11 19.12369 19 19 13.70 +49 38 38.9 20.2 GVEW042H01
CK18U010 C2018 11 19.13474 19 19 13.89 +49 38 34.5 19.9 GVEW042H01
CK18U010 KC2018 11 20.08039 19 19 29.66 +49 32 24.4 19.9 RoEW042291
CK18U010 KC2018 11 20.09114 19 19 29.82 +49 32 19.8 20.0 RoEW042291
CK18U010 KC2018 11 20.10191 19 19 30.00 +49 32 15.7 19.9 RoEW042291
Observer details:
033 Karl Schwarzschild Observatory, Tautenburg. Observers C. Hoegner,
B. Stecklum. Measurer B. Stecklum. 1.34-m f/3 Schmidt + CCD.
104 San Marcello Pistoiese. Observers P. Bacci, M. Maestripieri. Measurers
P. Bacci, L. Tesi, G. Fagioli. 0.60-m reflector + CCD.
118 Astronomical and Geophysical Observatory, Modra. Observer S. Gajdos.
0.6-m f/5.5 reflector + CCD.
215 Buchloe. Observer W. Hasubick. 0.44-m f/4.6 reflector + CCD.
291 LPL/Spacewatch II. Observer R. S. McMillan. 1.8-m f/2.7 reflector + CCD.
658 National Research Council of Canada. Observer D. D. Balam. 1.82-m
reflector + CCD.
711 McDonald Observatory, Fort Davis. Observer J. G. Ries. 2.1-m reflector
+ CCD + focal reducer.
734 Farpoint Observatory, Eskridge. Observer G. Hug. 0.7-m reflector + CCD.
954 Teide Observatory. Observer M. Serra-Ricart. Measurer S. Lemes-Perera.
C95 SATINO Remote Observatory, Haute Provence. Observer J. Jahn. 0.60-m
f/3.2 Newtonian reflector + CCD.
G40 Slooh.com Canary Islands Observatory. Observer K. Dankov. 0.43-m f/6.8
Corrected Dall-Kirkham + CCD.
G96 Mt. Lemmon Survey. Observer R. A. Kowalski. Measurers B. M. Africano,
E. J. Christensen, G. A. Farneth, D. C. Fuls, A. R. Gibbs, A. D. Grauer,
H. Groeller, 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 Ritchey-Chretien + CCD.
H06 iTelescope Observatory, Mayhill. Observer H. Sato. 0.43-m f/6.8
astrograph + CCD + f/4.5 focal reducer.
H36 Sandlot Observatory, Scranton. Observer G. Hug. 0.56-m reflector + CCD.
I52 Steward Observatory, Mt. Lemmon Station. Observers G. J. Leonard,
B. M. Africano, J. A. Johnson, R. A. Kowalski, H. Groeller. Measurers
B. M. Africano, E. J. Christensen, G. A. Farneth, D. C. Fuls, A. R. Gibbs,
A. D. Grauer, H. Groeller, J. A. Johnson, R. A. Kowalski, S. M. Larson,
G. J. Leonard, R. L. Seaman, F. C. Shelly. 1.0-m reflector + CCD.
J04 ESA Optical Ground Station, Tenerife. Observer D. Abreu. Measurers
M. Micheli, D. Koschny, A. Knoefel, M. Busch, E. Schwab. 1.0-m f/4.4
reflector + CCD.
J95 Great Shefford. Observer P. Birtwhistle. 0.41-m f/6.3
Schmidt-Cassegrain + CCD.
K63 G. Pascoli Observatory, Castelvecchio Pascoli. Observer R. Bacci.
0.41-m f/3.2 Newtonian reflector + CCD.
K88 GINOP-KHK, Piszkesteto. Observer A. Ordasi. Measurer K. Sarneczky.
0.60-m Schmidt + CCD.
L01 Visnjan Observatory, Tican. Observers K. Korlevic, G. Kervina. Measurer
K. Korlevic. 1.0-m f/2.9 reflector + CCD.
P93 Space Tracking and Communications Center, JAXA. Observers S. Okumura,
S. Urakawa. 1.0-m f/3.0 reflector + CCD.
Orbital elements:
C/2018 U1 (Lemmon)
Epoch 2021 Nov. 2.0 TT = JDT 2459520.5
T 2021 Nov. 1.48545 TT MPCW
q 4.9816788 (2000.0) P Q
z -0.0008175 Peri. 180.53303 -0.25342214 -0.30159966
+/-0.0004017 Node 75.48666 -0.88398118 +0.45809539
e 1.0040723 Incl. 108.29822 -0.39287975 -0.83617358
From 159 observations 2018 Oct. 27-Nov. 20, mean residual 0".4.
C/2018 U1 (Lemmon)
Epoch 2019 Apr. 27.0 TT = JDT 2458600.5
T 2021 Nov. 1.05898 TT MPCW
q 4.9861010 (2000.0) P Q
z -0.0006058 Peri. 180.43488 -0.25292954 -0.30206767
+/-0.0004017 Node 75.48523 -0.88475883 +0.45659098
e 1.0030207 Incl. 108.30049 -0.39144408 -0.83682722
From 159 observations 2018 Oct. 27-Nov. 20, mean residual 0".4.
Ephemeris:
C/2018 U1 (Lemmon)
Date TT R. A. (2000) Decl. Delta r Elong. Phase m1 m2
2018 10 21 19 15 11.7 +53 13 25 9.2344 9.3659 94.5 6.1 19.5
...
2018 11 05 19 16 12.8 +51 17 46 9.2360 9.2842 89.7 6.1 19.5
...
2018 11 13 19 17 42.4 +50 20 10 9.2409 9.2407 86.9 6.1 19.5
...
2018 11 19 19 19 11.8 +49 39 28 9.2455 9.2081 84.8 6.1 19.5
2018 11 20 19 19 28.3 +49 32 56 9.2463 9.2026 84.4 6.1 19.5
2018 11 21 19 19 45.4 +49 26 27 9.2472 9.1972 84.0 6.1 19.5
...
2018 11 27 19 21 36.5 +48 49 06 9.2521 9.1646 81.9 6.1 19.5
...
2018 12 05 19 24 26.4 +48 03 37 9.2580 9.1211 79.0 6.1 19.4
...
2018 12 20 19 30 37.0 +46 53 11 9.2635 9.0396 73.9 6.0 19.4
Gareth V. Williams (C) Copyright 2018 MPC M.P.E.C. 2018-W42
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