MPEC 2021-A99 : COMET C/2021 A1 (Leonard)
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M.P.E.C. 2021-A99 Issued 2021 January 10, 00:09 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/2021 A1 (Leonard)
G. J. Leonard reports the discovery of a comet in the images taken by
Mt. Lemmon Survey (G96) in 4 co-added 30s exposures on Jan. 3 UT. He reports
a condensed 10" coma and 5" broad tail extending towards position angle 250-270
deg. Subsequently, prediscovery astrometry was submitted dating back to
Apr. 2020. Additional reports of cometary features are as follows:
OC Date Reporter Coma Tail PA Exposures
G96 2020-11-21 D. Rankin 8"
K88 2020-11-24 K. Sarneczky 10" 3x90s
H06 2021-01-06 A. Valvasori 7" 15x120s
Observations:
CK21A010 C2020 04 11.31371 13 42 30.20 +46 30 28.7 VEA099G96
CK21A010 C2020 04 11.32304 13 42 29.75 +46 30 30.9 VEA099G96
CK21A010 C2020 04 11.33640 13 42 29.02 +46 30 33.8 VEA099G96
CK21A010 C2020 04 11.34179 13 42 28.78 +46 30 34.8 21.8 GVEA099G96
CK21A010 C2020 04 30.40562213 25 58.906+47 17 40.06 VEA099F51
CK21A010 C2020 04 30.41861613 25 58.156+47 17 40.85 22.42GVEA099F51
CK21A010 C2020 04 30.43150813 25 57.484+47 17 41.64 22.54GVEA099F51
CK21A010 C2020 05 03.37717513 23 26.700+47 20 09.64 21.98GVEA099F52
CK21A010 C2020 05 03.39035213 23 25.975+47 20 09.41 VEA099F52
CK21A010 C2020 05 03.40351013 23 25.266+47 20 09.90 22.39GVEA099F52
CK21A010 C2020 05 04.48962313 22 30.203+47 20 44.84 21.87GVEA099F51
CK21A010 C2020 05 04.50333913 22 29.466+47 20 45.29 22.26GVEA099F51
CK21A010 C2020 05 04.51507613 22 28.882+47 20 45.09 22.65GVEA099F51
CK21A010 C2020 05 28.35559113 04 28.215+46 52 41.47 21.91GVEA099F51
CK21A010 C2020 05 28.36755413 04 27.751+46 52 39.52 22.25GVEA099F51
CK21A010 C2020 05 28.37941813 04 27.253+46 52 37.69 23.35GVEA099F51
CK21A010 C2020 05 28.39211713 04 26.791+46 52 35.31 22.04GVEA099F51
CK21A010 C2020 05 29.28132413 03 52.968+46 50 10.48 22.35GVEA099F51
CK21A010 C2020 05 29.29695313 03 52.359+46 50 08.05 22.54GVEA099F51
CK21A010 C2020 05 29.31250913 03 51.800+46 50 05.30 20.93GVEA099F51
CK21A010 C2020 05 29.32875713 03 51.120+46 50 02.75 21.70GVEA099F51
CK21A010 C2020 05 31.25333613 02 39.748+46 44 30.40 22.55GVEA099F52
CK21A010 C2020 06 08.33123612 58 09.227+46 17 14.16 21.21GVEA099F52
CK21A010 C2020 06 10.39559012 57 07.940+46 09 18.82 22.30GVEA099F51
CK21A010 C2020 08 01.28463712 49 14.140+41 41 12.81 21.67GVEA099F51
CK21A010 C2020 08 01.29629512 49 14.242+41 41 09.84 22.04GVEA099F51
CK21A010 C2020 08 01.30798012 49 14.316+41 41 05.46 21.56GVEA099F51
CK21A010 C2020 08 01.31972512 49 14.473+41 41 01.68 21.21GVEA099F51
CK21A010 C2020 11 21.52799 13 43 08.91 +36 36 47.2 19.6 GVEA099G96
CK21A010 C2020 11 21.53084 13 43 09.00 +36 36 47.4 19.9 GVEA099G96
CK21A010 C2020 11 21.53370 13 43 09.15 +36 36 47.9 19.7 GVEA099G96
CK21A010 C2020 11 21.53655 13 43 09.21 +36 36 47.8 20.4 GVEA099G96
CK21A010 C2020 11 22.14701 13 43 30.84 +36 38 22.7 19.5 RoEA099K88
CK21A010 C2020 11 22.15408 13 43 31.13 +36 38 23.5 19.7 RoEA099K88
CK21A010 C2020 11 22.16125 13 43 31.40 +36 38 25.3 19.8 RoEA099K88
CK21A010 C2020 11 24.14901 13 44 41.41 +36 43 54.5 19.7 RoEA099K88
CK21A010 C2020 11 24.15611 13 44 41.64 +36 43 55.4 19.9 RoEA099K88
CK21A010 C2020 11 24.16317 13 44 41.90 +36 43 58.0 19.8 RoEA099K88
CK21A010 C2020 12 20.48929 13 58 34.27 +38 54 05.6 19.2 GVEA099703
CK21A010 C2020 12 20.49482 13 58 34.47 +38 54 08.3 19.3 GVEA099703
CK21A010 C2020 12 20.50035 13 58 34.48 +38 54 12.9 19.5 GVEA099703
CK21A010 C2021 01 02.43359 14 03 33.40 +40 41 16.3 19.2 GVEA099703
CK21A010 C2021 01 02.43913 14 03 33.56 +40 41 16.5 19.6 GVEA099703
CK21A010 C2021 01 02.45019 14 03 33.71 +40 41 24.1 19.4 GVEA099703
CK21A010* C2021 01 03.54226514 03 54.12 +40 51 49.9 19.00GVEA099G96
CK21A010 C2021 01 03.54742414 03 54.22 +40 51 52.7 19.27GVEA099G96
CK21A010 C2021 01 03.55256514 03 54.32 +40 51 55.9 19.33GVEA099G96
CK21A010 C2021 01 03.55771014 03 54.41 +40 51 58.7 19.09GVEA099G96
CK21A010 KC2021 01 04.45813814 04 10.48 +41 00 43.5 VEA099I52
CK21A010 KC2021 01 04.46535714 04 10.64 +41 00 48.6 VEA099I52
CK21A010 KC2021 01 04.47285214 04 10.79 +41 00 53.2 18.95GVEA099I52
CK21A010 KC2021 01 04.48585914 04 11.07 +41 00 59.9 VEA099I52
CK21A010 KC2021 01 04.50507614 04 11.36 +41 01 11.6 VEA099V06
CK21A010 KC2021 01 04.50873414 04 11.43 +41 01 13.8 19.45GVEA099V06
CK21A010 KC2021 01 04.51239114 04 11.51 +41 01 16.3 19.56GVEA099V06
CK21A010 2C2021 01 04.57873 14 04 12.75 +41 01 55.6 20.2 RoEA099F65
CK21A010 2C2021 01 04.60346 14 04 13.17 +41 02 10.4 20.2 RoEA099F65
CK21A010 2C2021 01 04.63864 14 04 13.75 +41 02 31.4 19.9 RoEA099F65
CK21A010 2C2021 01 04.64134 14 04 13.81 +41 02 33.2 19.9 RoEA099F65
CK21A010 hC2021 01 05.03812414 04 20.65 +41 06 26.4 19.5 GVEA099L01
CK21A010 hC2021 01 05.04163214 04 20.66 +41 06 28.7 19.6 GVEA099L01
CK21A010 hC2021 01 05.04510514 04 20.71 +41 06 30.8 19.6 GVEA099L01
CK21A010 HC2021 01 05.46990614 04 27.93 +41 10 46.4 18.61GVEA099I52
CK21A010 HC2021 01 05.47479114 04 27.97 +41 10 47.8 19.06GVEA099I52
CK21A010 HC2021 01 05.48027814 04 28.14 +41 10 51.4 19.16GVEA099I52
CK21A010 HC2021 01 05.48623714 04 28.22 +41 10 55.4 19.33GVEA099I52
CK21A010 KC2021 01 06.03763 14 04 37.31 +41 16 26.6 18.8 RVEA099I81
CK21A010 KC2021 01 06.04473 14 04 37.47 +41 16 30.6 18.9 RVEA099I81
CK21A010 KC2021 01 06.05183 14 04 37.59 +41 16 35.0 18.8 RVEA099I81
CK21A010 KC2021 01 06.06795 14 04 37.77 +41 16 45.0 18.7 RVEA099I81
CK21A010 KC2021 01 06.07507 14 04 37.93 +41 16 49.6 18.8 RVEA099I81
CK21A010 KC2021 01 06.08219 14 04 38.04 +41 16 53.5 18.8 RVEA099I81
CK21A010 eC2021 01 06.46771 14 04 44.38 +41 20 48.6 19.1 GVEA099H06
CK21A010 eC2021 01 06.48065 14 04 44.57 +41 20 57.1 19.2 GVEA099H06
CK21A010 qC2021 01 06.52841 14 04 45.18 +41 21 27.1 19.4 GVEA099H06
CK21A010 qC2021 01 06.53870 14 04 45.37 +41 21 33.3 19.1 GVEA099H06
CK21A010 KC2021 01 07.09053 14 04 54.16 +41 27 10.8 19.2 GVEA099L06
CK21A010 KC2021 01 07.09546 14 04 54.24 +41 27 14.0 19.3 GVEA099L06
CK21A010 KC2021 01 07.10048 14 04 54.31 +41 27 17.3 19.2 GVEA099L06
CK21A010 KC2021 01 07.69287 14 05 03.32 +41 33 25.3 18.8 VqEA099Q21
CK21A010 KC2021 01 07.70126 14 05 03.52 +41 33 31.2 18.6 VqEA099Q21
CK21A010 KC2021 01 08.00208 14 05 07.84 +41 36 37.3 18.6 RVEA099I81
CK21A010 KC2021 01 08.00920 14 05 07.98 +41 36 42.4 19.0 RVEA099I81
CK21A010 KC2021 01 08.11075 14 05 09.44 +41 37 46.2 18.1 RVEA099I81
CK21A010 KC2021 01 08.11969 14 05 09.57 +41 37 52.4 17.9 RVEA099I81
CK21A010 KC2021 01 08.12961 14 05 09.72 +41 37 58.3 19.0 RVEA099I81
CK21A010 C2021 01 08.60134314 05 16.53 +41 42 57.6 18.87oVEA099T08
CK21A010 C2021 01 08.60503214 05 16.58 +41 42 59.6 19.03oVEA099T08
CK21A010 C2021 01 08.61240314 05 16.64 +41 43 04.9 19.15oVEA099T08
CK21A010 C2021 01 08.62255314 05 16.77 +41 43 11.4 19.16oVEA099T08
CK21A010 KC2021 01 09.01697 14 05 22.32 +41 47 20.9 18.7 RVEA099I81
CK21A010 KC2021 01 09.02409 14 05 22.43 +41 47 25.3 18.7 RVEA099I81
CK21A010 KC2021 01 09.03120 14 05 22.55 +41 47 29.4 18.8 RVEA099I81
CK21A010 KC2021 01 09.05337 14 05 22.88 +41 47 44.9 19.4 RVEA099I81
CK21A010 KC2021 01 09.10792 14 05 23.71 +41 48 19.6 19.1 GVEA099595
CK21A010 KC2021 01 09.12005 14 05 23.82 +41 48 26.9 19.2 GVEA099595
CK21A010 KC2021 01 09.13218 14 05 23.98 +41 48 34.9 19.2 GVEA099595
CK21A010 C2021 01 09.47860 14 05 28.72 +41 52 17.7 oEA099711
CK21A010 C2021 01 09.48240 14 05 28.81 +41 52 20.6 oEA099711
CK21A010 C2021 01 09.48603 14 05 28.82 +41 52 22.9 oEA099711
CK21A010 C2021 01 09.48997 14 05 28.89 +41 52 25.6 oEA099711
Observer details:
595 Farra d'Isonzo. Observers S. Aschi, E. Pettarin. Measurer E. Pettarin.
0.40-m f/5.15 reflector + CCD.
703 Catalina Sky Survey. Observer H. Groeller. Measurers D. Rankin, B. Gray,
F. C. Shelly, E. J. Christensen. 1.5-m reflector + 10K CCD.
711 McDonald Observatory, Fort Davis. Observers J. G. Ries, B. P. Roman.
Measurer J. G. Ries. 2.1-m reflector + CCD + focal reducer.
F51 Pan-STARRS 1, Haleakala. Observers J. Bulger, K. Chambers, T. Dukes, T.
Lowe, A. Schultz, M. Willman. Measurers S. Chastel, M. Huber, Y.
Ramanjooloo, R. Wainscoat, R. Weryk. 1.8-m Ritchey-Chretien + CCD.
F52 Pan-STARRS 2, Haleakala. Observers J. Bulger, K. Chambers, T. Dukes, T.
Lowe, A. Schultz, M. Willman. Measurers S. Chastel, M. Huber, Y.
Ramanjooloo, R. Wainscoat, R. Weryk. 1.8-m Ritchey-Chretien + CCD.
F65 Haleakala-Faulkes Telescope North. Observer P. Breitenstein. Measurers
P. Breitenstein, M. Wawerzonnek. 2.0-m Ritchey-Chretien + CCD.
G96 Mt. Lemmon Survey. Observers H. Groeller, D. C. Fuls, G. J. Leonard.
Measurers D. Rankin, B. Gray, F. C. Shelly, E. J. Christensen, G. A.
Farneth, D. C. Fuls, A. R. Gibbs, A. D. Grauer, H. Groeller, R. A.
Kowalski, S. M. Larson, G. J. Leonard, T. A. Pruyne, R. L. Seaman, K. W.
Wierzchos. 1.5-m reflector + 10K CCD.
H06 iTelescope Observatory, Mayhill. Observers A. Valvasori, E. Guido, F. D.
Romanov. Measurers A. Valvasori, F. D. Romanov. , 0.43-m f/6.8 reflector
+ CCD + f/4.5 focal reducer.
I52 Steward Observatory, Mt. Lemmon Station. Observers H. Groeller, R. A.
Kowalski. Measurers E. J. Christensen, G. A. Farneth, D. C. Fuls, A. R.
Gibbs, A. D. Grauer, H. Groeller, R. A. Kowalski, S. M. Larson, G. J.
Leonard, T. A. Pruyne, D. Rankin, R. L. Seaman, F. C. Shelly, K. W.
Wierzchos. 1.0-m reflector + CCD.
I81 Tarbatness Observatory, Portmahomack. Observer D. Buczynski. 0.35-m
f/6.0 Schmidt-Cassegrain + 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.
L06 Sormano 2 Observatory, Bellagio Via Lattea. Observer G. Ventre. 0.28-m
f/10 reflector + CCD.
Q21 Southern Utsunomiya. Observer H. Nohara. 0.4-m f/3.8 astrograph + CCD.
T08 ATLAS-MLO, Mauna Loa. Observers L. Denneau, J. Tonry, A. Heinze, H.
Weiland. Measurers L. Denneau, J. Tonry, A. Heinze, H. Weiland, H.
Flewelling, A. Fitzsimmons, J. Robinson, N. Erasmus. 0.5-m reflector +
CCD.
V06 Catalina Sky Survey-Kuiper. Observer H. Groeller. Measurers E. J.
Christensen, G. A. Farneth, D. C. Fuls, A. R. Gibbs, A. D. Grauer, H.
Groeller, R. A. Kowalski, S. M. Larson, G. J. Leonard, T. A. Pruyne, D.
Rankin, R. L. Seaman, F. C. Shelly, K. W. Wierzchos. 1.55-m reflector +
1K CCD.
Orbital elements:
C/2021 A1 (Leonard)
Epoch 2022 Jan. 21.0 TT = JDT 2459600.5
T 2022 Jan. 3.32597 TT Rudenko
q 0.6152366 (2000.0) P Q
z +0.0000249 Peri. 225.09575 +0.63776630 +0.29156526
+/-0.0000139 Node 255.89483 +0.72787449 -0.53085203
e 0.9999847 Incl. 132.68647 -0.25189854 -0.79572974
From 101 observations 2020 Apr. 11-2021 Jan. 9, mean residual 0".5.
C/2021 A1 (Leonard)
Epoch 2020 Dec. 17.0 TT = JDT 2459200.5
T 2022 Jan. 3.30380 TT Rudenko
q 0.6149314 (2000.0) P Q
z -0.0000792 Peri. 225.09089 +0.63796886 +0.29128314
+/-0.0000139 Node 255.87128 +0.72768265 -0.53089651
e 1.0000487 Incl. 132.68579 -0.25193987 -0.79580339
From 101 observations 2020 Apr. 11-2021 Jan. 9, mean residual 0".5.
Ephemeris:
Date TT R. A. (2000) Decl. Delta r Elong. Phase m1 m2
2020 12 11 13 54 00.3 +37 54 15 5.4499 5.3103 76.7 10.4 19.4
...
2020 12 26 14 00 53.6 +39 36 03 5.1164 5.1605 87.1 11.0 19.2
...
2021 01 03 14 03 44.1 +40 46 37 4.9388 5.0798 92.6 11.1 19.0
...
2021 01 09 14 05 22.1 +41 47 11 4.8073 5.0189 96.8 11.2 18.9
2021 01 10 14 05 35.5 +41 57 54 4.7856 5.0087 97.4 11.2 18.9
2021 01 11 14 05 48.1 +42 08 49 4.7640 4.9985 98.1 11.2 18.9
...
2021 01 17 14 06 43.6 +43 18 05 4.6363 4.9372 102.1 11.2 18.8
...
2021 01 25 14 06 57.1 +45 00 04 4.4723 4.8549 107.2 11.2 18.6
...
2021 02 09 14 03 26.2 +48 37 00 4.1917 4.6991 115.3 10.9 18.3
M. P. C. Staff (C) Copyright 2021 MPC M.P.E.C. 2021-A99
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