MPEC 2021-A128 : 2021 AH4
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M.P.E.C. 2021-A128 Issued 2021 January 11, 04:43 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 AH4
Observations:
K21A04H* C2021 01 08.40996205 29 41.943-17 29 20.55 21.45wUEA128F51
K21A04H C2021 01 08.42094405 29 39.444-17 28 32.37 21.59wUEA128F51
K21A04H C2021 01 08.43175705 29 37.024-17 27 45.27 21.32wUEA128F51
K21A04H C2021 01 08.44260305 29 34.587-17 26 57.58 21.33wUEA128F51
K21A04H ^C2021 01 09.42216605 26 11.947-16 13 17.83 21.25GVEA128568
K21A04H ^C2021 01 09.42314105 26 11.720-16 13 13.27 21.34GVEA128568
K21A04H ^C2021 01 09.42411905 26 11.495-16 13 08.68 21.31GVEA128568
K21A04H KC2021 01 10.54167505 22 14.20 -14 41 43.2 20.8 GVEA128474
K21A04H KC2021 01 10.54523105 22 13.42 -14 41 25.4 20.6 GVEA128474
K21A04H KC2021 01 10.54878905 22 12.65 -14 41 07.3 20.6 GVEA128474
K21A04H 1C2021 01 10.88261 05 21 02.43 -14 14 08.8 22.0 VVEA128033
K21A04H 1C2021 01 10.88516 05 21 01.82 -14 13 55.6 22.1 VVEA128033
K21A04H KC2021 01 11.15417305 20 04.86 -13 50 24.2 21.41GVEA128V06
K21A04H KC2021 01 11.15550705 20 04.55 -13 50 16.7 21.37GVEA128V06
K21A04H KC2021 01 11.15683905 20 04.24 -13 50 10.0 22.35GVEA128V06
K21A04H KC2021 01 11.15817205 20 03.89 -13 50 02.8 20.62GVEA128V06
Observer details:
033 Karl Schwarzschild Observatory, Tautenburg. Observers S. Melnikov, U.
Laux, B. Stecklum. Measurer B. Stecklum. 1.34-m f/3 Schmidt + CCD.
474 Mount John Observatory, Lake Tekapo. Observers A. C. Gilmore, P. M.
Kilmartin. Measurer P. M. Kilmartin. 1.0-m f/7.7 reflector + CCD.
568 Mauna Kea. Observers R. Wainscoat, L. Wells, T. Burdullis. Measurers R.
Weryk, R. Wainscoat. 3.6-m Canada-France-Hawaii Telescope + CCD.
F51 Pan-STARRS 1, Haleakala. Observers J. Bulger, T. Lowe, A. Schultz, M.
Willman. Measurers K. Chambers, S. Chastel, T. de Boer, L. Denneau, J.
Fairlamb, H. Flewelling, M. Huber, C.-C. Lin, E. Magnier, Y. Ramanjooloo,
R. Wainscoat, R. Weryk. 1.8-m Ritchey-Chretien + CCD.
V06 Catalina Sky Survey-Kuiper. 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. 1.55-m reflector +
1K CCD.
Orbital elements:
2021 AH4 Earth MOID = 0.0533 AU
Epoch 2020 Dec. 17.0 TT = JDT 2459200.5 Bell
M 288.49641 (2000.0) P Q
n 0.75174587 Peri. 58.31729 -0.96165871 +0.02080586
a 1.1979040 Node 121.51909 -0.08439401 -0.97118304
e 0.1969044 Incl. 18.71043 +0.26094095 -0.23742498
P 1.31 H 23.76 G 0.15 U 7
Residuals in seconds of arc
210108 F51 0.0+ 0.1+ 210109 568 0.0- 0.0+ 210110 033 0.0+ 0.4-
210108 F51 0.2- 0.2+ 210109 568 0.0+ 0.0- 210111 V06 0.1- 0.3-
210108 F51 0.2- 0.2+ 210109 568 0.0+ 0.0- 210111 V06 0.1+ 0.2+
210108 F51 0.1+ 0.2- 210110 474 0.7- 0.2+ 210111 V06 0.1+ 0.0+
210108 F51 0.1+ 0.2- 210110 474 0.2- 0.1- 210111 V06 0.3- 0.3+
210108 F51 0.1+ 0.2- 210110 474 0.5+ 0.0-
210109 568 0.0+ 0.0+ 210110 033 0.3+ 0.5-
Ephemeris:
2021 AH4 a,e,i = 1.20, 0.20, 19 q = 0.9620
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2020 12 12 06 31 24.0 -29 32 34 0.3044 1.1836 124.4 43.3 23.2
...
2020 12 27 06 05 28.9 -27 01 37 0.2205 1.1364 129.5 41.9 22.4
...
2021 01 04 05 43 56.3 -22 01 18 0.1803 1.1113 131.7 41.4 21.9
...
2021 01 10 05 24 11.8 -15 26 58 0.1540 1.0929 132.2 41.8 21.5
2021 01 11 05 20 37.1 -14 03 12 0.1500 1.0899 132.2 42.0 21.5
2021 01 12 05 16 57.8 -12 33 43 0.1462 1.0868 132.0 42.2 21.4
...
2021 01 18 04 53 28.0 -01 29 53 0.1272 1.0691 129.4 45.3 21.2
...
2021 01 26 04 18 00.5 +18 11 10 0.1151 1.0466 119.8 54.7 21.2
...
2021 02 10 02 53 39.2 +52 58 58 0.1375 1.0094 95.5 76.7 22.1
M. P. C. Staff (C) Copyright 2021 MPC M.P.E.C. 2021-A128
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