MPEC 2021-C168 : 2021 CA4
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M.P.E.C. 2021-C168 Issued 2021 February 10, 00:44 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
2021 CA4
Observations:
K21C04A C2021 02 07.32575 09 49 27.25 -14 24 13.9 20.2 GVEC168703
K21C04A C2021 02 07.34147 09 49 38.38 -14 22 11.0 19.6 GVEC168703
K21C04A* C2021 02 09.31656010 16 06.85 -09 26 42.4 19.55GVEC168G96
K21C04A C2021 02 09.32168810 16 11.02 -09 25 51.2 19.85GVEC168G96
K21C04A C2021 02 09.32682710 16 15.21 -09 24 59.5 19.63GVEC168G96
K21C04A C2021 02 09.33196110 16 19.41 -09 24 08.0 19.44GVEC168G96
K21C04A KC2021 02 09.40350810 17 17.98 -09 12 05.4 19.30GVEC168I52
K21C04A KC2021 02 09.40520510 17 19.38 -09 11 47.8 19.08GVEC168I52
K21C04A KC2021 02 09.59919 10 20 12.64 -08 36 19.7 19.7 VqEC168E23
K21C04A KC2021 02 09.61377 10 20 24.79 -08 33 48.3 19.8 VqEC168E23
K21C04A KC2021 02 09.63144 10 20 39.43 -08 30 44.7 19.8 VqEC168E23
K21C04A 1C2021 02 09.95451 10 25 29.66 -07 36 51.4 20.5 VVEC168033
K21C04A 1C2021 02 09.95526 10 25 30.30 -07 36 43.3 20.5 VVEC168033
K21C04A 1C2021 02 09.95601 10 25 30.94 -07 36 35.2 20.3 VVEC168033
K21C04A 1C2021 02 09.95684 10 25 31.65 -07 36 26.4 20.6 VVEC168033
K21C04A 1C2021 02 09.95927 10 25 33.79 -07 36 00.2 20.5 VVEC168033
K21C04A 1C2021 02 09.96001 10 25 34.43 -07 35 52.3 20.6 VVEC168033
K21C04A 1C2021 02 09.96076 10 25 35.07 -07 35 44.2 20.4 VVEC168033
K21C04A 1C2021 02 09.96232 10 25 36.42 -07 35 27.5 20.4 VVEC168033
Observer details:
033 Karl Schwarzschild Observatory, Tautenburg. Observers S. Melnikov, C.
Hoegner, B. Stecklum. Measurer B. Stecklum. 1.34-m f/3 Schmidt + CCD.
703 Catalina Sky Survey. Observer R. A. Kowalski. Measurers E. J.
Christensen, B. Gray, D. Rankin, F. C. Shelly. 0.68-m Schmidt + 10K CCD.
E23 Arcadia. Observer A. Hidas. 0.35-m f/1.9 reflector + CCD.
G96 Mt. Lemmon Survey. Observer G. J. Leonard. 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. 1.5-m reflector + 10K CCD.
I52 Steward Observatory, Mt. Lemmon Station. Observer D. Rankin. 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.
Orbital elements:
2021 CA4 Earth MOID = 0.0515 AU
Epoch 2020 Dec. 17.0 TT = JDT 2459200.5 Veres
M 334.49716 (2000.0) P Q
n 0.37854202 Peri. 10.07385 -0.91067106 -0.38708824
a 1.8926050 Node 145.98825 +0.35881450 -0.91427582
e 0.4527190 Incl. 14.95654 +0.20476910 -0.11942542
P 2.60 H 24.8 G 0.15 U 7
Residuals in seconds of arc
210207 703 0.9- 0.8+ 210209 I52 0.2- 0.2+ 210209 033 0.3- 0.2-
210207 703 1.0+ 0.9- 210209 E23 0.7+ 0.6- 210209 033 0.2+ 0.1+
210209 G96 0.0 0.1+ 210209 E23 0.8+ 0.0 210209 033 0.2+ 0.1+
210209 G96 0.2- 0.0 210209 E23 0.5- 0.4+ 210209 033 0.0 0.1+
210209 G96 0.2- 0.1+ 210209 033 0.1+ 0.3- 210209 033 0.0 0.2+
210209 G96 0.1- 0.1+ 210209 033 0.1- 0.2-
210209 I52 0.3- 0.1- 210209 033 0.2- 0.1-
Ephemeris:
2021 CA4 a,e,i = 1.89, 0.45, 15 q = 1.0358
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2021 01 11 07 34 54.4 -28 09 27 0.2217 1.1386 130.0 41.4 23.4
...
2021 01 26 08 14 32.8 -27 11 21 0.1329 1.0808 133.8 41.1 22.2
...
2021 02 03 09 04 23.6 -21 34 22 0.09117 1.0588 141.8 35.1 21.2
...
2021 02 09 10 11 34.6 -10 17 25 0.06714 1.0468 152.9 25.4 20.2
2021 02 10 10 26 07.8 -07 26 56 0.06432 1.0452 154.6 23.9 20.1
2021 02 11 10 41 38.7 -04 19 15 0.06198 1.0438 155.8 22.8 19.9
...
2021 02 17 12 27 33.0 +17 00 09 0.06008 1.0376 144.4 33.7 20.2
...
2021 02 25 14 27 32.6 +33 47 26 0.08519 1.0362 120.9 55.0 21.5
...
2021 03 12 16 01 26.1 +40 11 06 0.1576 1.0547 108.7 63.2 23.1
M. P. C. Staff (C) Copyright 2021 MPC M.P.E.C. 2021-C168
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