MPEC 2021-A123 : 2021 AC4
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M.P.E.C. 2021-A123 Issued 2021 January 11, 01:19 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 AC4
Observations:
K21A04C* C2021 01 10.31629109 10 14.50 +16 09 17.9 18.76GVEA123703
K21A04C C2021 01 10.32678909 10 58.79 +16 13 20.5 19.17GVEA123703
K21A04C C2021 01 10.33203809 11 20.85 +16 15 20.2 18.52GVEA123703
K21A04C KC2021 01 10.34992209 12 34.08 +16 21 54.3 18.05GVEA123I52
K21A04C KC2021 01 10.35041409 12 36.06 +16 22 05.5 18.39GVEA123I52
K21A04C KC2021 01 10.35090309 12 38.03 +16 22 16.1 18.12GVEA123I52
K21A04C KC2021 01 10.35138709 12 39.98 +16 22 26.3 18.02GVEA123I52
K21A04C KC2021 01 10.40172009 15 56.42 +16 39 36.0 18.59GVEA123I52
K21A04C KC2021 01 10.40362909 16 03.60 +16 40 12.9 18.33GVEA123I52
K21A04C KC2021 01 10.40553909 16 10.79 +16 40 49.4 18.06GVEA123I52
K21A04C KC2021 01 10.40744609 16 17.95 +16 41 25.9 18.64GVEA123I52
K21A04C KC2021 01 10.87021 09 42 01.99 +18 26 44.8 19.2 GVEA123N88
K21A04C KC2021 01 10.87074 09 42 03.25 +18 26 51.0 19.4 GVEA123N88
K21A04C KC2021 01 10.92502009 45 06.89 +18 33 55.1 19.2 GVEA123L01
K21A04C KC2021 01 10.92572209 45 08.42 +18 34 02.8 19.3 GVEA123L01
K21A04C IC2021 01 10.92801609 45 13.46 +18 34 27.4 19.6 GVEA123L01
K21A04C KC2021 01 10.92895109 45 15.47 +18 34 37.2 19.6 GVEA123L01
K21A04C 1C2021 01 10.94906 09 45 56.28 +18 36 35.1 19.8 VVEA123033
K21A04C 1C2021 01 10.94965 09 45 57.53 +18 36 41.3 19.9 VVEA123033
K21A04C 1C2021 01 10.95022 09 45 58.76 +18 36 47.1 19.8 VVEA123033
K21A04C KC2021 01 10.95672209 46 24.77 +18 38 57.9 19.6 GVEA123I93
K21A04C KC2021 01 10.96100609 46 33.88 +18 39 42.8 19.6 GVEA123I93
K21A04C KC2021 01 10.96535009 46 43.07 +18 40 28.2 19.5 GVEA123I93
K21A04C KC2021 01 10.96652109 46 38.58 +18 40 51.6 19.3 GVEA123203
K21A04C KC2021 01 10.97903509 47 04.31 +18 42 57.1 19.4 GVEA123203
K21A04C KC2021 01 10.99302709 47 32.42 +18 45 14.1 VEA123203
Observer details:
033 Karl Schwarzschild Observatory, Tautenburg. Observers S. Melnikov, U.
Laux, B. Stecklum. Measurer B. Stecklum. 1.34-m f/3 Schmidt + CCD.
203 GiaGa Observatory. Observers S. Foglia, G. Galli. Measurer G. Galli.
0.36-m f/5.76 Schmidt-Cassegrain + CCD.
703 Catalina Sky Survey. Observer 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. 0.68-m Schmidt + 10K
CCD.
I52 Steward Observatory, Mt. Lemmon Station. Observer T. A. Pruyne.
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.
I93 St Pardon de Conques. Observer F. Losse. 0.40-m f/3.7 reflector + CCD.
L01 Visnjan Observatory, Tican. Observer K. Korlevic. 1.0-m f/2.9 reflector
+ CCD.
N88 Xingming Observatory #3, Nanshan. Observer X. Gao. Measurer Q.-Z. Ye.
0.6-m f/8 Ritchey-Chretien + CCD.
Orbital elements:
2021 AC4 Earth MOID = 0.0019 AU
Epoch 2020 Dec. 17.0 TT = JDT 2459200.5 Veres
M 358.60317 (2000.0) P Q
n 0.44428169 Peri. 333.62004 +0.10431752 -0.99344795
a 1.7009718 Node 110.36234 +0.92105075 +0.07879474
e 0.4369528 Incl. 2.85403 +0.37521111 +0.08278024
P 2.22 H 28.9 G 0.15 U 6
Residuals in seconds of arc
210110 703 0.4- 0.8- 210110 I52 0.1+ 0.2- 210110 033 0.0 0.0
210110 703 0.6- 0.2- 210110 I52 0.0 0.1- 210110 033 0.1+ 0.0
210110 703 (2.0+ 0.6+) 210110 N88 1.2- 1.3- 210110 I93 0.2+ 0.2+
210110 I52 0.2+ 0.0 210110 N88 0.1- 0.5- 210110 I93 0.1- 0.2+
210110 I52 0.1+ 0.6+ 210110 L01 0.2+ 0.2+ 210110 I93 0.1- 0.5+
210110 I52 0.0 0.6+ 210110 L01 0.1+ 0.3+ 210110 203 0.1+ 0.0
210110 I52 0.0 0.3+ 210110 L01 0.2+ 0.2+ 210110 203 0.6+ 0.0
210110 I52 0.6+ 0.0 210110 L01 0.3- 0.1- 210110 203 0.1- 0.1+
210110 I52 0.2+ 0.0 210110 033 0.2+ 0.0
Ephemeris:
2021 AC4 a,e,i = 1.70, 0.44, 3 q = 0.9577
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2020 12 12 22 50 42.9 -23 05 19 0.1137 0.9624 75.5 97.9 27.6
...
2020 12 27 23 05 35.7 -22 44 57 0.05418 0.9610 64.2 112.9 26.8
...
2021 01 04 23 26 27.9 -23 07 45 0.02137 0.9731 61.0 117.9 25.2
...
2021 01 10 08 38 10.3 +13 43 15 0.0044310.9876 160.8 19.1 18.1
2021 01 11 09 47 19.8 +18 54 43 0.0081630.9904 147.6 32.1 19.8
2021 01 12 10 13 01.9 +20 24 05 0.01216 0.9932 142.9 36.6 20.8
...
2021 01 18 10 46 42.2 +22 03 45 0.03684 1.0128 141.2 37.5 23.3
...
2021 01 26 10 51 19.9 +22 26 17 0.07056 1.0448 147.6 30.4 24.5
...
2021 02 10 10 45 15.9 +22 29 40 0.1388 1.1191 161.4 16.4 25.7
M. P. C. Staff (C) Copyright 2021 MPC M.P.E.C. 2021-A123
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