MPEC 2018-X13 : COMET C/2018 V4 (Africano)
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M.P.E.C. 2018-X13 Issued 2018 Dec. 1, 18:13 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 V4 (Africano)
This object was rpeorted as a comet by B. M. Africano (G96), who
described it as showinig a diffuse 5"-7" coma, with a potential tail in P.A.
225, in four stacked 30-s exposures. After posting on the NEOCP/PCCP, numerous
other observers remarked on the cometary appearance, incluing: M. T. Read (691,
291), who reported a 15" narrow tail in P.A. 225 on Nov. 5; R. Holmes (807,
Nov. 5), who descrived a 15" tail in 15 co-added 15-s exposures; H. Sato (Q62,
Nov. 8), who described a moderately-condensed 8" coma; and R. A. Mastaler (291,
Nov. 14), described a 18" diffuse tail in P.A. ~225.
Observations:
CK18V040 C2018 10 23.62394105 32 04.375-11 19 57.73 19.8 GVEX013F52
CK18V040 C2018 10 23.63105005 32 04.132-11 19 55.24 20.0 GVEX013F52
CK18V040 C2018 10 23.63824305 32 03.895-11 19 52.89 19.5 GVEX013F52
CK18V040* C2018 11 04.42953 05 23 38.09 -10 12 33.0 19.7 GVEX013G96
CK18V040 C2018 11 04.43472 05 23 37.80 -10 12 30.7 19.9 GVEX013G96
CK18V040 C2018 11 04.43991 05 23 37.53 -10 12 28.1 19.8 GVEX013G96
CK18V040 C2018 11 04.44510 05 23 37.27 -10 12 26.0 20.1 GVEX013G96
CK18V040 C2018 11 04.49868 05 23 34.48 -10 12 03.6 19.9 GVEX013G96
CK18V040 C2018 11 04.50444 05 23 34.15 -10 12 01.5 19.8 GVEX013G96
CK18V040 C2018 11 04.51023 05 23 33.81 -10 11 58.7 21.1 GVEX013G96
CK18V040 C2018 11 04.51605 05 23 33.45 -10 11 56.2 19.8 GVEX013G96
CK18V040 C2018 11 04.52429 05 23 33.04 -10 11 53.0 20.9 GVEX013G96
CK18V040 C2018 11 04.52533 05 23 33.07 -10 11 52.5 19.9 GVEX013G96
CK18V040 C2018 11 04.52585 05 23 32.97 -10 11 51.9 19.6 GVEX013G96
CK18V040 (C2018 11 05.08572 05 23 04.08 -10 07 58.6 19.8 GUEX013G40
CK18V040 (C2018 11 05.10249 05 23 03.12 -10 07 50.7 19.9 GUEX013G40
CK18V040 |C2018 11 05.25816 05 22 54.83 -10 06 40.8 20.4 VuEX013807
CK18V040 |C2018 11 05.25999 05 22 54.73 -10 06 40.1 20.4 VuEX013807
CK18V040 |C2018 11 05.26182 05 22 54.65 -10 06 39.6 20.2 VuEX013807
CK18V040 C2018 11 05.39989 05 22 47.25 -10 05 44.8 VEX013I52
CK18V040 C2018 11 05.40645 05 22 46.86 -10 05 42.1 20.1 GVEX013I52
CK18V040 C2018 11 05.41301 05 22 46.59 -10 05 38.8 20.9 GVEX013I52
CK18V040 KC2018 11 05.44884 05 22 44.61 -10 05 23.8 19.5 RoEX013691
CK18V040 KC2018 11 05.45559 05 22 44.29 -10 05 20.2 19.5 RoEX013691
CK18V040 KC2018 11 05.46233 05 22 43.88 -10 05 17.1 19.4 RoEX013691
CK18V040 KC2018 11 05.49020 05 22 42.31 -10 05 06.8 19.4 RoEX013291
CK18V040 KC2018 11 05.49884 05 22 41.89 -10 05 02.1 19.8 RoEX013291
CK18V040 KC2018 11 05.50750 05 22 41.34 -10 04 59.1 19.7 RoEX013291
CK18V040 KC2018 11 06.05629 05 22 12.13 -10 01 00.6 19.9 RoEX013K88
CK18V040 KC2018 11 06.06279 05 22 11.76 -10 00 58.9 19.6 RoEX013K88
CK18V040 KC2018 11 06.39268 05 21 53.91 -09 58 33.3 oEX013711
CK18V040 KC2018 11 06.39604 05 21 53.71 -09 58 31.9 oEX013711
CK18V040 KC2018 11 06.39896 05 21 53.54 -09 58 30.8 oEX013711
CK18V040 C2018 11 06.51135 05 21 47.30 -09 57 41.0 22.0 GVEX013I52
CK18V040 C2018 11 06.51481 05 21 47.05 -09 57 39.7 20.0 GVEX013I52
CK18V040 C2018 11 06.51771 05 21 46.89 -09 57 37.8 20.0 GVEX013I52
CK18V040 C2018 11 06.52173 05 21 46.66 -09 57 37.9 20.9 GVEX013I52
CK18V040 KC2018 11 06.61205 05 21 41.84 -09 56 53.7 19.5 RqEX013E94
CK18V040 KC2018 11 06.62515 05 21 41.06 -09 56 48.2 19.5 RqEX013E94
CK18V040 KC2018 11 06.63909 05 21 40.30 -09 56 41.9 19.5 RqEX013E94
CK18V040 C2018 11 06.78122 05 21 32.51 -09 55 42.2 21.0 R EX013P93
CK18V040 C2018 11 06.78607 05 21 32.23 -09 55 39.1 20.1 R EX013P93
CK18V040 C2018 11 06.79093 05 21 31.98 -09 55 36.5 20.2 R EX013P93
CK18V040 C2018 11 06.79576 05 21 31.67 -09 55 34.1 20.1 R EX013P93
CK18V040 9C2018 11 07.09473 05 21 15.29 -09 53 19.9 20.2 VUEX013G40
CK18V040 9C2018 11 07.11111 05 21 14.39 -09 53 12.6 UEX013G40
CK18V040 C2018 11 07.31927 05 21 02.90 -09 51 39.0 20.0 GVEX013V06
CK18V040 C2018 11 07.33496 05 21 02.02 -09 51 31.8 20.6 GVEX013V06
CK18V040 C2018 11 07.35064 05 21 01.09 -09 51 25.0 20.2 GVEX013V06
CK18V040 C2018 11 07.36633 05 21 00.22 -09 51 17.9 20.0 GVEX013V06
CK18V040 C2018 11 07.40806 05 20 57.78 -09 50 59.1 oEX013691
CK18V040 C2018 11 07.42174 05 20 56.93 -09 50 52.9 oEX013691
CK18V040 C2018 11 07.43540 05 20 56.22 -09 50 46.7 oEX013691
CK18V040 C2018 11 07.47819 05 20 53.78 -09 50 27.9 19.8 GVEX013I52
CK18V040 C2018 11 07.48253 05 20 53.52 -09 50 24.7 20.4 GVEX013I52
CK18V040 C2018 11 07.49862 05 20 52.60 -09 50 17.2 19.4 GVEX013I52
CK18V040 C2018 11 08.38228 05 20 02.68 -09 43 31.9 VEX013I52
CK18V040 C2018 11 08.38769 05 20 02.37 -09 43 27.3 19.9 GVEX013I52
CK18V040 C2018 11 08.39245 05 20 02.04 -09 43 25.7 VEX013I52
CK18V040 C2018 11 08.39618 05 20 01.83 -09 43 24.6 VEX013I52
CK18V040 KC2018 11 08.44033 05 19 59.30 -09 43 01.5 oEX013711
CK18V040 KC2018 11 08.44446 05 19 59.06 -09 42 59.7 oEX013711
CK18V040 KC2018 11 08.44860 05 19 58.81 -09 42 57.6 oEX013711
CK18V040 1C2018 11 08.71870 05 19 43.27 -09 40 46.8 VEX013Q62
CK18V040 1C2018 11 08.72140 05 19 43.09 -09 40 45.9 VEX013Q62
CK18V040 1C2018 11 08.72409 05 19 42.91 -09 40 44.5 19.9 GVEX013Q62
CK18V040 C2018 11 09.48676405 18 58.656-09 34 41.82 19.68GVEX013F52
CK18V040 KC2018 11 10.10748205 18 21.77 -09 29 38.7 20.4 GVEX013L01
CK18V040 KC2018 11 10.10981905 18 21.61 -09 29 37.7 20.2 GVEX013L01
CK18V040 KC2018 11 10.11215305 18 21.46 -09 29 37.0 20.1 GVEX013L01
CK18V040 KC2018 11 10.11525905 18 21.27 -09 29 35.9 20.1 GVEX013L01
CK18V040 C2018 11 12.33875 05 16 05.57 -09 10 39.9 19.7 GVEX013I52
CK18V040 C2018 11 12.34187 05 16 05.34 -09 10 38.1 19.5 GVEX013I52
CK18V040 C2018 11 12.35938 05 16 04.24 -09 10 28.9 20.3 GVEX013I52
CK18V040 HC2018 11 14.43604 05 13 51.56 -08 51 39.2 oEX013291
CK18V040 HC2018 11 14.44440 05 13 51.06 -08 51 34.0 oEX013291
CK18V040 HC2018 11 14.45218 05 13 50.54 -08 51 29.9 oEX013291
CK18V040 HC2018 11 15.33448 05 12 52.69 -08 43 09.5 oEX013691
CK18V040 HC2018 11 15.34520 05 12 52.04 -08 43 02.8 oEX013691
CK18V040 HC2018 11 15.35591 05 12 51.28 -08 42 56.6 oEX013691
CK18V040 C2018 11 15.38520 05 12 49.30 -08 42 40.7 VEX013I52
CK18V040 C2018 11 15.39290 05 12 48.80 -08 42 35.3 VEX013I52
CK18V040 C2018 11 15.39633 05 12 48.60 -08 42 34.5 VEX013I52
CK18V040 C2018 11 15.39955 05 12 48.30 -08 42 33.4 20.3 GVEX013I52
CK18V040 C2018 11 15.40549 05 12 47.95 -08 42 29.7 20.2 GVEX013G96
CK18V040 C2018 11 15.40953 05 12 47.67 -08 42 26.4 20.2 GVEX013G96
CK18V040 C2018 11 15.41355 05 12 47.39 -08 42 24.5 20.2 GVEX013G96
CK18V040 C2018 11 15.41758 05 12 47.12 -08 42 21.8 20.2 GVEX013G96
CK18V040 C2018 11 15.97893 05 12 09.83 -08 36 57.6 21.9 VSEX013033
CK18V040 C2018 11 15.98100 05 12 09.69 -08 36 56.0 22.0 VSEX013033
CK18V040 C2018 11 15.98304 05 12 09.54 -08 36 54.8 22.2 VSEX013033
CK18V040 HC2018 11 16.30109 05 11 48.27 -08 33 47.1 20.0 RoEX013691
CK18V040 HC2018 11 16.30519 05 11 47.93 -08 33 45.7 19.4 RoEX013691
CK18V040 HC2018 11 16.30915 05 11 47.68 -08 33 42.5 19.8 RoEX013691
CK18V040 C2018 11 16.36725 05 11 43.71 -08 33 09.2 20.6 GVEX013I52
CK18V040 C2018 11 16.37135 05 11 43.45 -08 33 07.6 20.1 GVEX013I52
CK18V040 C2018 11 16.37545 05 11 43.14 -08 33 04.0 20.0 GVEX013I52
CK18V040 C2018 11 16.38892 05 11 42.29 -08 32 55.5 21.0 GVEX013I52
CK18V040 C2018 11 17.36638 05 10 35.91 -08 23 09.6 19.3 GVEX013I52
CK18V040 C2018 11 17.37034 05 10 35.65 -08 23 08.6 19.4 GVEX013I52
CK18V040 C2018 11 17.38560 05 10 34.46 -08 23 00.0 20.0 GVEX013I52
CK18V040 KC2018 11 18.97030 05 08 44.60 -08 06 38.7 19.5 RqEX013C10
CK18V040 KC2018 11 18.98853 05 08 43.32 -08 06 27.1 19.5 RqEX013C10
CK18V040 KC2018 11 19.00677 05 08 42.06 -08 06 16.0 19.4 RqEX013C10
CK18V040 KC2018 11 19.10826 05 08 35.04 -08 05 06.0 19.8 VUEX013X31
CK18V040 KC2018 11 19.11109 05 08 34.82 -08 05 04.2 19.8 VUEX013X31
CK18V040 KC2018 11 19.12382 05 08 33.87 -08 04 55.7 20.0 VUEX013X31
CK18V040 ^C2018 11 21.34289 05 05 55.25 -07 40 51.3 20.8 RoEX013695
CK18V040 ^C2018 11 21.34612 05 05 55.02 -07 40 49.0 20.6 RoEX013695
CK18V040 ^C2018 11 21.34936 05 05 54.78 -07 40 46.8 oEX013695
CK18V040 KC2018 11 25.06336 05 01 19.55 -06 57 18.6 19.8 VUEX013X31
CK18V040 KC2018 11 25.08830 05 01 17.64 -06 57 01.5 19.8 VUEX013X31
CK18V040 KC2018 11 25.11270 05 01 15.77 -06 56 43.1 19.9 VUEX013X31
CK18V040 C2018 11 27.29245 04 58 28.99 -06 29 35.4 20.8 GVEX013I52
CK18V040 C2018 11 27.29557 04 58 28.67 -06 29 32.6 VEX013I52
CK18V040 C2018 11 27.29833 04 58 28.43 -06 29 31.4 20.3 GVEX013I52
CK18V040 C2018 11 27.30148 04 58 28.22 -06 29 29.8 19.3 GVEX013I52
CK18V040 KC2018 11 28.89540404 56 24.36 -06 08 40.5 20.7 GVEX013K41
CK18V040 KC2018 11 28.90149504 56 23.93 -06 08 39.5 20.4 GVEX013K41
CK18V040 KC2018 11 28.90748704 56 23.53 -06 08 35.2 19.8 GVEX013K41
CK18V040 KC2018 11 28.91358104 56 23.08 -06 08 31.2 19.9 GVEX013K41
CK18V040 C2018 11 29.33868 04 55 49.57 -06 02 52.4 19.8 GVEX013I52
CK18V040 C2018 11 29.34122 04 55 49.44 -06 02 51.0 19.4 GVEX013I52
CK18V040 C2018 11 29.34375 04 55 49.21 -06 02 48.5 19.2 GVEX013I52
CK18V040 C2018 11 29.34537 04 55 49.09 -06 02 46.8 19.9 GVEX013I52
Observer details:
033 Karl Schwarzschild Observatory, Tautenburg. Observers C. Hoegner,
B. Stecklum. Measurer B. Stecklum. 1.34-m f/3 Schmidt + CCD.
291 LPL/Spacewatch II. Observers M. T. Read, R. A. Mastaler. 1.8-m f/2.7
reflector + CCD.
691 Steward Observatory, Kitt Peak-Spacewatch. Observers M. T. Read,
R. A. Mastaler. 0.9-m f/3 reflector + CCD.
695 Kitt Peak. Observer J. V. Scotti. 2.3-m f/9 reflector + CCD.
711 McDonald Observatory, Fort Davis. Observer J. G. Ries. 2.1-m reflector
+ CCD + focal reducer.
807 Cerro Tololo Observatory, La Serena. Observers T. Linder, R. Holmes.
0.61-m f/6.5 astrograph + CCD.
C10 Maisoncelles. Observer J.-F. Soulier. 0.30-m f/3.8 Newtonian reflector
+ CCD.
E94 Possum Observatory, Gisborne. Observer J. Drummond. 0.41-m f/4.5
Newtonian reflector + CCD.
F52 Pan-STARRS 2, Haleakala. Observers J. Bulger, K. Chambers, T. Dukes,
T. Lowe, E. Magnier, A. Schultz, M. Willman. Measurers S. Chastel,
M. Huber, Y. Ramanjooloo, R. Wainscoat, R. Weryk. 1.8-m Ritchey-Chretien
+ CCD.
G40 Slooh.com Canary Islands Observatory. Observers K. Dankov,
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 H. Groeller,
G. J. Leonard, B. M. Africano, 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. 1.0-m reflector + CCD.
K41 Vegaquattro Astronomical Observatory, Novi Ligure. Observer V. Luna.
0.3-m Schmidt-Cassegrain + CCD.
K88 GINOP-KHK, Piszkesteto. Observer A. Ordasi. Measurer K. Sarneczky.
0.60-m Schmidt + CCD.
L01 Visnjan Observatory, Tican. Observer K. Korlevic. 1.0-m f/2.9 reflector
+ CCD.
P93 Space Tracking and Communications Center, JAXA. Observers K. Nishiyama,
S. Urakawa. 1.0-m f/3.0 reflector + CCD, 0.5-m f/2.0 reflector + CCD.
Q62 iTelescope Observatory, Siding Spring. Observer H. Sato. 0.51-m f/6.8
astrograph + CCD + f/4.5 focal reducer.
V06 Catalina Sky Survey-Kuiper. 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. 1.55-m reflector + CCD.
X31 Galileo Galilei Observatory, Oro Verde. Observers C. Fornari, D. Godoy,
F. Alsina. Measurer C. Fornari. 0.35-m f/11 Schmidt-Cassegrain + CCD.
Orbital elements:
C/2018 V4 (Africano)
Epoch 2019 Mar. 18.0 TT = JDT 2458560.5
T 2019 Mar. 1.84297 TT MPCW
q 3.1992986 (2000.0) P Q
z +0.0041581 Peri. 0.04906 +0.20125035 -0.35069085
+/-0.0003134 Node 78.37236 +0.89839192 -0.30602783
e 0.9866969 Incl. 69.03102 +0.39037195 +0.88507790
From 117 observations 2018 Oct. 23-Nov. 29, mean residual 0".6.
C/2018 V4 (Africano)
Epoch 2019 Apr. 27.0 TT = JDT 2458600.5
T 2019 Mar. 1.83178 TT MPCW
q 3.1992872 (2000.0) P Q
z +0.0041620 Peri. 0.04635 +0.20126683 -0.35068027
+/-0.0003134 Node 78.37236 +0.89840640 -0.30598576
e 0.9866846 Incl. 69.03109 +0.39033012 +0.88509664
From 117 observations 2018 Oct. 23-Nov. 29, mean residual 0".6.
Ephemeris:
C/2018 V4 (Africano)
Date TT R. A. (2000) Decl. Delta r Elong. Phase m1 m2
2018 11 01 05 26 26.7 -10 34 54 2.6935 3.3992 128.3 13.2 20.0
...
2018 11 16 05 12 08.4 -08 36 42 2.5203 3.3541 141.8 10.5 19.8
...
2018 11 24 05 02 39.5 -07 10 11 2.4533 3.3322 148.0 9.0 19.7
...
2018 11 30 04 54 57.7 -05 53 59 2.4169 3.3168 151.4 8.2 19.6
2018 12 01 04 53 38.7 -05 40 21 2.4120 3.3143 151.8 8.1 19.6
2018 12 02 04 52 19.2 -05 26 28 2.4075 3.3118 152.2 8.0 19.6
...
2018 12 08 04 44 16.8 -03 57 57 2.3883 3.2976 153.2 7.7 19.6
...
2018 12 16 04 33 35.9 -01 47 29 2.3837 3.2800 151.1 8.3 19.5
...
2018 12 31 04 15 19.6 +02 43 17 2.4391 3.2516 139.7 11.3 19.6
Gareth V. Williams (C) Copyright 2018 MPC M.P.E.C. 2018-X13
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