MPEC 2018-S04 : COMET C/2018 R3 (Lemmon)
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M.P.E.C. 2018-S04 Issued 2018 Sept. 16, 16:47 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 R3 (Lemmon)
Reports of the cometary nature of this object have been received from:
H. Sato (H06), who reported a 5".1 FWHM (stellar 3".6), condensed 8" coma and
no obvious tail in 16 stacked 60-second exposures on Sept. 8.4 UTC; R. Weryk
(F51), who reported a 1".8 FWHM (stellar 1".15 +/- 0".06) and a short ~4" tail
towards the east in prediscovery images on Aug. 8 and 13; and E. J. Christensen
(I52), who reported a 8" coma extended to the north-east, in four stacked
30-s exposures in good conditions.
Observations:
CK18R030 C2018 08 08.44576121 59 13.117-10 18 11.81 19.61GVES004F51
CK18R030 C2018 08 08.45703621 59 12.305-10 18 11.02 VES004F51
CK18R030 C2018 08 08.46828321 59 11.526-10 18 09.62 19.84GVES004F51
CK18R030 C2018 08 08.47955121 59 10.736-10 18 08.55 19.75GVES004F51
CK18R030 C2018 08 13.45883921 53 17.631-10 09 54.46 19.68GVES004F51
CK18R030* C2018 09 07.16249 21 21 42.85 -09 24 10.1 19.2 GVES004G96
CK18R030 C2018 09 07.16811 21 21 42.44 -09 24 08.7 19.4 GVES004G96
CK18R030 C2018 09 07.17374 21 21 42.02 -09 24 08.4 19.5 GVES004G96
CK18R030 C2018 09 07.17936 21 21 41.59 -09 24 07.7 19.2 GVES004G96
CK18R030 C2018 09 07.32125 21 21 30.72 -09 23 49.0 19.1 GVES004G96
CK18R030 C2018 09 07.32610 21 21 30.24 -09 23 48.3 19.6 GVES004G96
CK18R030 C2018 09 07.33095 21 21 29.86 -09 23 48.4 20.4 GVES004G96
CK18R030 KC2018 09 07.47918 21 21 18.69 -09 23 24.5 20.6 GVES004474
CK18R030 KC2018 09 07.48129 21 21 18.56 -09 23 24.4 20.1 GVES004474
CK18R030 KC2018 09 07.48340 21 21 18.38 -09 23 24.0 20.2 GVES004474
CK18R030 KC2018 09 07.48551 21 21 18.23 -09 23 23.7 20.2 GVES004474
CK18R030 C2018 09 08.21223 21 20 23.27 -09 21 51.7 19.9 GVES004I52
CK18R030 C2018 09 08.21732 21 20 22.92 -09 21 51.3 19.8 GVES004I52
CK18R030 C2018 09 08.22240 21 20 22.47 -09 21 49.6 19.8 GVES004I52
CK18R030 C2018 09 08.22748 21 20 22.07 -09 21 49.4 19.4 GVES004I52
CK18R030 C2018 09 08.39392 21 20 09.56 -09 21 23.6 20.2 GVES004474
CK18R030 C2018 09 08.39790 21 20 09.27 -09 21 23.1 20.3 GVES004474
CK18R030 C2018 09 08.40188 21 20 08.93 -09 21 22.4 20.1 GVES004474
CK18R030 1C2018 09 08.44898 21 20 05.42 -09 21 16.9 VES004Q62
CK18R030 1C2018 09 08.45228 21 20 05.16 -09 21 16.2 VES004Q62
CK18R030 1C2018 09 08.45558 21 20 04.90 -09 21 15.9 19.3 VES004Q62
CK18R030 KC2018 09 08.79469121 19 39.39 -09 20 33.6 20.0 GVES004L01
CK18R030 KC2018 09 08.81081521 19 38.16 -09 20 32.1 19.8 GVES004L01
CK18R030 C2018 09 09.22361 21 19 07.11 -09 19 36.0 19.6 GVES004I52
CK18R030 C2018 09 09.22734 21 19 06.83 -09 19 35.5 19.7 GVES004I52
CK18R030 C2018 09 09.23324 21 19 06.36 -09 19 34.3 19.3 GVES004I52
CK18R030 C2018 09 09.23776 21 19 06.01 -09 19 34.8 19.8 GVES004I52
CK18R030 C2018 09 10.21352 21 17 53.17 -09 17 21.9 19.6 GVES004I52
CK18R030 C2018 09 10.21680 21 17 52.88 -09 17 20.8 20.7 GVES004I52
CK18R030 C2018 09 10.22305 21 17 52.40 -09 17 19.5 19.1 GVES004I52
CK18R030 KC2018 09 10.83940 21 17 06.75 -09 15 55.8 19.6 RqES004L27
CK18R030 KC2018 09 10.86280 21 17 04.99 -09 15 52.3 19.5 RqES004L27
CK18R030 KC2018 09 10.88619 21 17 03.24 -09 15 48.8 19.5 RqES004L27
CK18R030 9C2018 09 10.90548 21 17 01.83 -09 15 44.8 19.8 VUES004G40
CK18R030 9C2018 09 10.92940 21 17 00.03 -09 15 41.5 19.9 VUES004G40
CK18R030 C2018 09 11.22270 21 16 38.33 -09 15 02.0 19.4 G ES004I52
CK18R030 C2018 09 11.22595 21 16 38.09 -09 15 01.9 20.1 G ES004I52
CK18R030 C2018 09 11.22897 21 16 37.82 -09 15 00.6 19.6 G ES004I52
CK18R030 C2018 09 11.23216 21 16 37.59 -09 15 00.3 20.2 G ES004I52
CK18R030 KC2018 09 11.81726 21 15 54.60 -09 13 38.2 20.2 GVES004595
CK18R030 KC2018 09 11.85132 21 15 52.12 -09 13 33.8 19.3 GVES004595
CK18R030 KC2018 09 11.88154 21 15 49.75 -09 13 29.7 18.9 VES004104
CK18R030 KC2018 09 11.89112 21 15 49.15 -09 13 27.8 19.1 VES004104
CK18R030 KC2018 09 12.79419 21 14 43.16 -09 11 19.6 20.0 VqES004A71
CK18R030 KC2018 09 12.80495 21 14 42.45 -09 11 17.9 20.1 VqES004A71
CK18R030 KC2018 09 12.81659 21 14 41.55 -09 11 16.7 20.2 VqES004A71
CK18R030 C2018 09 13.12286 21 14 19.37 -09 10 31.6 20.3 RoES004926
CK18R030 C2018 09 13.12728 21 14 19.08 -09 10 30.4 20.3 RoES004926
CK18R030 C2018 09 13.13170 21 14 18.70 -09 10 29.6 20.4 RoES004926
CK18R030 C2018 09 13.16870 21 14 16.07 -09 10 24.5 20.2 RoES004926
CK18R030 C2018 09 13.17311 21 14 15.72 -09 10 24.5 20.7 RoES004926
CK18R030 C2018 09 13.17752 21 14 15.31 -09 10 23.5 20.0 RoES004926
CK18R030 C2018 09 13.20491 21 14 13.33 -09 10 19.8 19.4 GUES004I52
CK18R030 C2018 09 13.21463 21 14 12.61 -09 10 18.5 19.5 GUES004I52
CK18R030 C2018 09 13.22566 21 14 11.79 -09 10 16.8 19.6 GUES004I52
CK18R030 C2018 09 13.24309 21 14 10.56 -09 10 14.8 19.5 GUES004I52
CK18R030 KC2018 09 13.83420 21 13 28.08 -09 08 49.2 19.2 RqES004K63
CK18R030 KC2018 09 13.84233 21 13 27.42 -09 08 47.3 19.1 RqES004K63
CK18R030 KC2018 09 13.84737 21 13 27.03 -09 08 45.4 19.0 RqES004K63
CK18R030 KC2018 09 15.13433 21 11 54.99 -09 05 37.3 oES004711
CK18R030 KC2018 09 15.13771 21 11 54.72 -09 05 36.8 oES004711
CK18R030 KC2018 09 15.14107 21 11 54.46 -09 05 36.3 oES004711
CK18R030 C2018 09 15.18641 21 11 51.28 -09 05 28.7 20.2 GVES004I52
CK18R030 C2018 09 15.18921 21 11 51.12 -09 05 28.2 20.2 GVES004I52
CK18R030 HC2018 09 15.19157 21 11 50.90 -09 05 28.2 oES004691
CK18R030 C2018 09 15.19309 21 11 50.82 -09 05 27.6 19.5 GVES004I52
CK18R030 HC2018 09 15.20338 21 11 50.18 -09 05 26.7 oES004691
CK18R030 HC2018 09 15.21474 21 11 49.20 -09 05 24.5 oES004691
CK18R030 KC2018 09 15.84052 21 11 05.00 -09 03 50.8 19.6 RoES004K88
CK18R030 KC2018 09 15.84536 21 11 04.62 -09 03 51.0 19.5 RoES004K88
CK18R030 C2018 09 16.24880 21 10 36.32 -09 02 48.8 19.2 GVES004I52
CK18R030 C2018 09 16.25692 21 10 35.71 -09 02 47.5 19.4 GVES004I52
CK18R030 C2018 09 16.26104 21 10 35.42 -09 02 46.8 19.5 GVES004I52
Observer details:
104 San Marcello Pistoiese. Observers P. Bacci, M. Maestripieri. Measurers
P. Bacci, L. Tesi, G. Fagioli. 0.60-m 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.
595 Farra d'Isonzo. Observers U. Montanar, E. Pettarin, F. Piani. Measurer
U. Montanar. 0.61-m f/4.0 reflector + CCD.
691 Steward Observatory, Kitt Peak-Spacewatch. Observer R. A. Mastaler.
0.9-m f/3 reflector + CCD.
711 McDonald Observatory, Fort Davis. Observer J. G. Ries. 2.1-m reflector
+ CCD + focal reducer.
926 Tenagra II Observatory, Nogales. Observers M. Schwartz,
P. R. Holvorcem. Measurer M. Schwartz. 0.81-m f/7 Ritchey-Chretien +
CCD.
A71 Stixendorf. Observers M. Jaeger, E. Prosperi, S. Prosperi, W. Vollmann.
Measurer M. Jaeger. 0.3-m f/4 reflector + CCD.
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, R. Weryk. 1.8-m
Ritchey-Chretien + CCD.
G40 Slooh.com Canary Islands Observatory. Observer B. Lutkenhoner. 0.5-m
f/6.8 Corrected Dall-Kirkham + CCD.
G96 Mt. Lemmon Survey. Observer B. M. Africano. 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.
I52 Steward Observatory, Mt. Lemmon Station. Observers G. J. Leonard,
R. A. Kowalski, E. J. Christensen, D. C. Fuls. 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.
K63 G. Pascoli Observatory, Castelvecchio Pascoli. Observer R. Bacci.
0.41-m f/3.2 Newtonian reflector + CCD.
K88 GINOP-KHK, Piszkesteto. Observer K. Sarneczky. 0.60-m Schmidt + CCD.
L01 Visnjan Observatory, Tican. Observer K. Korlevic. 1.0-m f/2.9 reflector
+ CCD.
L27 29PREMOTE Observatory, Dauban. Observer J.-F. Soulier. 0.20-m f/4
Newtonian reflector + CCD.
Q62 iTelescope Observatory, Siding Spring. Observer H. Sato. 0.43-m f/6.8
astrograph + CCD.
Orbital elements:
C/2018 R3 (Lemmon)
Epoch 2019 June 6.0 TT = JDT 2458640.5
T 2019 June 7.18212 TT MPCW
q 1.2905679 (2000.0) P Q
z +0.0004677 Peri. 112.87485 -0.13202501 -0.82928094
+/-0.0002185 Node 324.62533 +0.10167933 +0.53358815
e 0.9993964 Incl. 69.71399 +0.98601760 -0.16606266
From 75 observations 2018 Aug. 8-Sept. 16, mean residual 0".4.
C/2018 R3 (Lemmon)
Epoch 2018 Mar. 23.0 TT = JDT 2458200.5
T 2019 June 7.20415 TT MPCW
q 1.2904987 (2000.0) P Q
z +0.0005974 Peri. 112.88116 -0.13221157 -0.82923420
+/-0.0002185 Node 324.62605 +0.10159897 +0.53362536
e 0.9992291 Incl. 69.72419 +0.98600089 -0.16617646
From 75 observations 2018 Aug. 8-Sept. 16, mean residual 0".4.
Ephemeris:
C/2018 R3 (Lemmon)
Date TT R. A. (2000) Decl. Delta r Elong. Phase m1 m2
2018 08 17 21 48 56.2 -10 03 59 2.9609 3.9719 176.3 0.9 19.8
...
2018 09 01 21 29 38.0 -09 36 55 2.8454 3.8208 162.7 4.5 19.6
...
2018 09 09 21 19 23.9 -09 20 04 2.8159 3.7396 152.7 7.1 19.5
...
2018 09 15 21 12 04.5 -09 05 55 2.8074 3.6785 145.2 9.0 19.4
2018 09 16 21 10 53.9 -09 03 25 2.8070 3.6683 144.0 9.3 19.4
2018 09 17 21 09 44.0 -09 00 52 2.8069 3.6580 142.7 9.6 19.4
...
2018 09 23 21 03 04.7 -08 44 41 2.8122 3.5966 135.4 11.3 19.3
...
2018 10 01 20 55 13.2 -08 20 33 2.8327 3.5143 125.9 13.4 19.2
...
2018 10 16 20 44 13.3 -07 26 52 2.9021 3.3588 108.8 16.3 19.1
Gareth V. Williams (C) Copyright 2018 MPC M.P.E.C. 2018-S04
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