MPEC 2021-A100 : COMET C/2021 A2 (NEOWISE)
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M.P.E.C. 2021-A100 Issued 2021 January 10, 00:37 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 A2 (NEOWISE)
J. Chesley reports the discovery of a comet in NEOWISE (C51) survey data
obtained on Jan 3. UT. She reports a 5 arcmin coma in detected in the 4.6
micron channel. Additional reports of cometary features are as follows:
OC Date Reporter Coma Tail PA Exposures
Q38 2021-01-05 M. Mattiazzo 120" 10x30s
X02 2021-01-06 E. Guido 60" 10x20s
W88 2021-01-06 M. Suzuki 19" 17" 40-80 3x50s
Q38 2021-01-06 M. Mattiazzo 60"
I47 2021-01-07 M. Masek 144"
W88 2021-01-07 B. Lutkenhoner 8" 20" 50 6x50s
Q38 2021-01-07 M. Mattiazzo 120"
Q56 2021-01-07 E. Bryssinck 150" 10x180s
G39 2021-01-07 E. Bryssinck 86" 15x30s
Q62 2021-01-09 K. Yoshimoto 78" 8x30s
Observations:
CK21A020* S2021 01 03.02153 10 59 50.39 -50 44 43.8 15 RLEA100C51
CK21A020 s2021 01 03.02153 1 - 2578.8543 - 1240.7324 - 6237.1205 EA100C51
CK21A020 S2021 01 03.15231 10 59 22.00 -50 43 20.3 LEA100C51
CK21A020 s2021 01 03.15231 1 - 2569.1680 - 1239.4956 - 6241.3538 EA100C51
CK21A020 S2021 01 03.21776 10 59 07.63 -50 42 38.6 LEA100C51
CK21A020 s2021 01 03.21776 1 - 2537.3009 - 1211.3930 - 6259.8776 EA100C51
CK21A020 S2021 01 03.28308 10 58 53.27 -50 41 57.1 LEA100C51
CK21A020 s2021 01 03.28308 1 - 2559.4790 - 1238.2030 - 6245.5824 EA100C51
CK21A020 S2021 01 03.34854 10 58 38.90 -50 41 13.6 LEA100C51
CK21A020 s2021 01 03.34854 1 - 2527.6500 - 1210.0025 - 6264.0396 EA100C51
CK21A020 S2021 01 03.41386 10 58 24.45 -50 40 30.8 LEA100C51
CK21A020 s2021 01 03.41386 1 - 2549.8106 - 1236.8785 - 6249.7908 EA100C51
CK21A020 S2021 01 03.47931 10 58 10.01 -50 39 47.7 LEA100C51
CK21A020 s2021 01 03.47931 1 - 2517.9967 - 1208.5562 - 6268.1951 EA100C51
CK21A020 S2021 01 03.54464 10 57 55.44 -50 39 04.8 LEA100C51
CK21A020 s2021 01 03.54464 1 - 2540.0964 - 1235.4538 - 6254.0185 EA100C51
CK21A020 C2021 01 05.49356 10 50 18.72 -50 14 29.0 14.8 GVEA100Q38
CK21A020 C2021 01 05.50037 10 50 16.94 -50 14 23.3 15.1 GVEA100Q38
CK21A020 C2021 01 05.50234 10 50 16.43 -50 14 21.1 15.1 GVEA100Q38
CK21A020 KC2021 01 06.14591 10 47 34.23 -50 04 56.7 15.9 GVEA100X31
CK21A020 KC2021 01 06.14660 10 47 34.04 -50 04 55.9 15.8 GVEA100X31
CK21A020 KC2021 01 06.14729 10 47 33.84 -50 04 55.3 16.0 GVEA100X31
CK21A020 KC2021 01 06.14797 10 47 33.67 -50 04 54.7 15.8 GVEA100X31
CK21A020 KC2021 01 06.15002 10 47 33.12 -50 04 52.5 15.4 GVEA100X31
CK21A020 KC2021 01 06.15973 10 47 30.68 -50 04 44.3 15.8 GVEA100X31
CK21A020 KC2021 01 06.16057 10 47 30.44 -50 04 43.5 15.7 GVEA100X31
CK21A020 KC2021 01 06.16195 10 47 30.00 -50 04 42.6 15.7 GVEA100X31
CK21A020 C2021 01 06.18250 10 47 24.92 -50 04 23.1 15.0 RqEA100W89
CK21A020 C2021 01 06.18607 10 47 23.96 -50 04 20.0 15.0 RqEA100W89
CK21A020 C2021 01 06.18964 10 47 23.03 -50 04 16.9 15.1 RqEA100W89
CK21A020 #C2021 01 06.25703 10 47 05.43 -50 03 15.9 15.2 GVEA100W88
CK21A020 #C2021 01 06.26049 10 47 04.50 -50 03 12.9 15.1 GVEA100W88
CK21A020 #C2021 01 06.28029 10 46 59.31 -50 02 54.8 15.1 GVEA100W88
CK21A020 KC2021 01 06.32094 10 46 48.60 -50 02 17.8 16.0 GVEA100X02
CK21A020 KC2021 01 06.32465 10 46 47.61 -50 02 14.2 16.0 GVEA100X02
CK21A020 KC2021 01 06.47673 10 46 08.85 -49 59 46.2 15.3 RqEA100E94
CK21A020 KC2021 01 06.49333 10 46 04.47 -49 59 30.8 15.3 RqEA100E94
CK21A020 KC2021 01 06.50984 10 46 00.18 -49 59 14.9 15.4 RqEA100E94
CK21A020 KC2021 01 06.52636 10 45 55.81 -49 58 59.9 15.3 RqEA100E94
CK21A020 KC2021 01 06.54287 10 45 51.42 -49 58 44.3 15.3 RqEA100E94
CK21A020 KC2021 01 06.55938 10 45 47.00 -49 58 28.8 15.2 RqEA100E94
CK21A020 KC2021 01 06.59250 10 45 38.22 -49 57 57.1 15.2 RqEA100E94
CK21A020 KC2021 01 06.60902 10 45 33.79 -49 57 41.6 15.1 RqEA100E94
CK21A020 C2021 01 06.90783710 44 15.151-49 52 44.89 16.6 GVEA100K93
CK21A020 C2021 01 06.90950810 44 14.696-49 52 43.01 16.6 GVEA100K93
CK21A020 C2021 01 06.91117310 44 14.267-49 52 41.62 16.7 GVEA100K93
CK21A020 C2021 01 06.91282710 44 13.807-49 52 40.09 16.6 GVEA100K93
CK21A020 C2021 01 06.91449310 44 13.346-49 52 38.45 16.7 GVEA100K93
CK21A020 KC2021 01 07.11920 10 43 18.65 -49 49 08.2 15.6 VqEA100I47
CK21A020 KC2021 01 07.12479 10 43 17.08 -49 49 02.0 15.7 VqEA100I47
CK21A020 KC2021 01 07.13039 10 43 15.56 -49 48 57.0 15.6 VqEA100I47
CK21A020 %C2021 01 07.16983 10 43 04.86 -49 48 17.9 15.2 GVEA100W88
CK21A020 %C2021 01 07.17109 10 43 04.51 -49 48 16.6 15.3 GVEA100W88
CK21A020 %C2021 01 07.17271 10 43 04.06 -49 48 15.0 15.2 GVEA100W88
CK21A020 %C2021 01 07.17403 10 43 03.71 -49 48 13.6 15.2 GVEA100W88
CK21A020 %C2021 01 07.17619 10 43 03.13 -49 48 11.6 15.3 GVEA100W88
CK21A020 %C2021 01 07.17758 10 43 02.75 -49 48 10.1 15.3 GVEA100W88
CK21A020 %C2021 01 07.17966 10 43 02.17 -49 48 08.0 15.3 GVEA100W88
CK21A020 %C2021 01 07.18100 10 43 01.83 -49 48 06.6 15.2 GVEA100W88
CK21A020 %C2021 01 07.19405 10 42 58.25 -49 47 53.6 15.2 GVEA100W88
CK21A020 %C2021 01 07.19538 10 42 57.90 -49 47 52.1 15.1 GVEA100W88
CK21A020 3C2021 01 07.21159 10 42 53.46 -49 47 35.8 15.9 GVEA100W88
CK21A020 3C2021 01 07.21506 10 42 52.47 -49 47 32.2 16.0 GVEA100W88
CK21A020 3C2021 01 07.21855 10 42 51.55 -49 47 28.8 15.9 GVEA100W88
CK21A020 C2021 01 07.22689 10 42 49.57 -49 47 20.9 14.9 RqEA100G39
CK21A020 C2021 01 07.25309 10 42 42.28 -49 46 54.7 14.8 RqEA100G39
CK21A020 C2021 01 07.27061 10 42 37.31 -49 46 37.4 14.8 RqEA100G39
CK21A020 C2021 01 07.27881 10 42 35.17 -49 46 28.4 14.7 RqEA100G39
CK21A020 C2021 01 07.28706 10 42 32.78 -49 46 20.0 14.9 RqEA100G39
CK21A020 C2021 01 07.29525 10 42 30.38 -49 46 11.7 14.9 RqEA100G39
CK21A020 C2021 01 07.30348 10 42 28.14 -49 46 03.3 14.9 RqEA100G39
CK21A020 KC2021 01 07.32754 10 42 21.62 -49 45 35.7 15.2 VqEA100I47
CK21A020 KC2021 01 07.33126 10 42 20.49 -49 45 31.7 15.4 VqEA100I47
CK21A020 KC2021 01 07.33406 10 42 19.74 -49 45 28.7 15.3 VqEA100I47
CK21A020 C2021 01 07.51575 10 41 30.74 -49 42 10.9 14.8 GVEA100Q38
CK21A020 C2021 01 07.51656 10 41 30.57 -49 42 10.0 14.4 GVEA100Q38
CK21A020 C2021 01 07.51817 10 41 30.14 -49 42 08.2 VEA100Q38
CK21A020 C2021 01 07.53861 10 41 24.18 -49 41 46.1 14.4 RqEA100Q56
CK21A020 C2021 01 07.54688 10 41 21.94 -49 41 38.1 14.2 RqEA100Q56
CK21A020 KC2021 01 08.11304 10 38 43.86 -49 31 05.1 15.6 GVEA100X31
CK21A020 KC2021 01 08.11421 10 38 43.55 -49 31 03.6 15.6 GVEA100X31
CK21A020 KC2021 01 08.11579 10 38 43.10 -49 31 02.7 15.5 GVEA100X31
CK21A020 %C2021 01 08.24986 10 38 04.67 -49 28 28.6 14.8 GVEA100W88
CK21A020 %C2021 01 08.25079 10 38 04.39 -49 28 27.5 14.8 GVEA100W88
CK21A020 %C2021 01 08.25169 10 38 04.10 -49 28 26.4 14.8 GVEA100W88
CK21A020 %C2021 01 08.30150 10 37 49.66 -49 27 28.5 14.8 GVEA100W88
CK21A020 %C2021 01 08.30249 10 37 49.37 -49 27 27.4 14.8 GVEA100W88
CK21A020 %C2021 01 08.30347 10 37 49.06 -49 27 26.2 14.8 GVEA100W88
CK21A020 %C2021 01 08.31554 10 37 45.57 -49 27 12.0 14.9 GVEA100W88
CK21A020 %C2021 01 08.31653 10 37 45.26 -49 27 10.8 15.0 GVEA100W88
CK21A020 %C2021 01 08.31747 10 37 45.01 -49 27 09.7 14.8 GVEA100W88
CK21A020 C2021 01 08.52766 10 36 45.29 -49 22 53.1 14.7 GVEA100Q38
CK21A020 C2021 01 08.53051 10 36 44.38 -49 22 49.3 14.7 GVEA100Q38
CK21A020 C2021 01 08.53297 10 36 43.72 -49 22 46.4 14.5 GVEA100Q38
CK21A020 C2021 01 08.53706 10 36 42.46 -49 22 41.4 14.8 GVEA100Q38
CK21A020 aC2021 01 09.72957 10 30 45.69 -48 56 53.7 VEA100Q62
CK21A020 aC2021 01 09.73318 10 30 44.61 -48 56 49.5 VEA100Q62
CK21A020 aC2021 01 09.73477 10 30 44.11 -48 56 47.1 12.7 RVEA100Q62
Observer details:
C51 WISE. Observer Near-Earth Object Wide-field Infrared Survey Explorer.
Measurers A. K. Mainzer, J. M. Bauer, T. Grav, J. R. Masiero, R. M. Cutri,
J. W. Dailey, E. Kramer, J. Pittichova, E. L. Wright.
E94 Possum Observatory, Gisborne. Observer J. Drummond. 0.41-m f/4.5
Newtonian reflector + CCD.
G39 ROAD, San Pedro de Atacama. Observer F.-J. Hambsch. Measurer E.
Bryssinck. 0.4-m f/6.8 reflector + CCD.
I47 Pierre Auger Observatory, Malargue. Observer M. Masek. 0.3-m f/6.8
reflector + CCD.
K93 Sutherland-LCO C. Observers M. Kelley, T. Lister, M. Knight, Q. Ye, J.
Chatelain, E. Gomez, S. Greenstreet. Measurer T. Lister. 1.0-m f/8.0
Ritchey-Chretien + CCD.
Q38 Swan Hill. Observer M. Mattiazzo.
Q56 Heavens Mirror Observatory, Yass. Observers E. Bryssinck, E. Guido, M.
Rocchetto, M. Fulle, G. Milani, C. Nassef, G. Savini, A. Valvasori.
Measurer E. Bryssinck. 0.1-m f/3.6 refractor + CCD.
Q62 iTelescope Observatory, Siding Spring. Observer K. Yoshimoto. 0.50-m
f/6.8 reflector + CCD + f/4.5 focal reducer.
W88 Slooh.com Chile Observatory, La Dehesa. Observers M. Suzuki, N. Paul, B.
Lutkenhoner. 0.35-m f/11.0 Schmidt-Cassegrain + CCD, 0.43-m f/6.8
Corrected Dall-Kirkham + CCD.
W89 Cerro Tololo-LCO Aqawan A #1. Observer A. Hale. Measurer R. Miles.
0.40-m f/8 Schmidt-Cassegrain + CCD.
X02 Telescope Live, El Sauce. Observers E. Guido, M. Rocchetto, E. Bryssinck,
M. Fulle, G. Milani, C. Nassef, G. Savini, A. Valvasori. Measurer E.
Guido. 0.6-m f/6.5 astrograph + CCD.
X31 Galileo Galilei Observatory, Oro Verde. Observers C. Fornari, C. Gimenez,
C. Kranewitter, O. Delpino. Measurer C. Fornari. 0.40-m f/8 Ritchey-
Chretien + CCD.
Orbital elements:
C/2021 A2
T 2021 Jan. 22.71435 TT Rudenko
q 1.4130330 (2000.0) P Q
z +0.0003655 Peri. 338.91270 -0.62411120 +0.01550060
Node 125.22155 +0.78047728 +0.05921667
e 0.9994836 Incl. 107.01210 -0.03661182 +0.99812480
From 90 observations 2021 Jan. 3-9.
Ephemeris:
Date TT R. A. (2000) Decl. Delta r Elong. Phase m1 m2
2020 12 11 11 44 56.5 -51 52 27 1.6256 1.5404 67.2 36.1 16.4
...
2020 12 26 11 23 07.7 -51 37 01 1.2739 1.4685 80.0 41.3 15.7
...
2021 01 03 10 59 55.4 -50 45 01 1.0751 1.4415 88.8 43.0 15.2
...
2021 01 09 10 34 26.2 -49 13 07 0.9259 1.4269 96.7 43.2 14.9
2021 01 10 10 29 22.4 -48 50 30 0.9014 1.4249 98.1 43.1 14.8
2021 01 11 10 24 03.5 -48 25 07 0.8771 1.4232 99.6 42.9 14.7
...
2021 01 17 09 46 41.9 -44 35 56 0.7372 1.4155 109.8 40.8 14.3
...
2021 01 25 08 43 57.1 -33 59 55 0.5831 1.4134 126.9 33.9 13.8
...
2021 02 09 06 45 10.5 +05 11 53 0.5393 1.4349 138.3 27.2 13.7
M. P. C. Staff (C) Copyright 2021 MPC M.P.E.C. 2021-A100
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