MPEC 2023-J51 : 2021 EG4
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M.P.E.C. 2023-J51 Issued 2023 May 7, 14:05 UT
The Minor Planet Electronic Circulars contain information on unusual
minor planets, routine data on comets and natural satellites,
and occasional editorial announcements. 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 EG4
Revision to MPEC 2021-E141
Additional Observations:
K21E04G C2023 03 24.50251815 21 32.224+18 31 07.20 22.97GVEJ051F52
K21E04G C2023 03 24.51405115 21 30.444+18 31 13.64 23.08GVEJ051F52
K21E04G C2023 03 24.52562015 21 28.691+18 31 20.36 22.45GVEJ051F52
K21E04G KC2023 04 01.39845815 00 51.510+19 29 17.60 22.66GVEJ051I52
K21E04G KC2023 04 01.43437615 00 45.450+19 29 28.90 22.50GVEJ051I52
K21E04G 0C2023 04 15.46420114 21 54.172+19 42 53.55 22.89GVEJ051T12
K21E04G 0C2023 04 15.49187314 21 49.598+19 42 47.93 23.28GVEJ051T12
Observer details:
F52 Pan-STARRS 2, Haleakala. Observers J. Bulger, K. Chambers, T. Dukes, T.
Lowe, A. Schultz, I. Smith. Measurers S. Chastel, J. Fairlamb, M. Huber,
Y. Ramanjooloo, R. Wainscoat, R. Weryk. 1.8-m Ritchey-Chretien + CCD.
I52 Steward Observatory, Mt. Lemmon Station. Observer J. K. Hogan. Measurers
E. J. Christensen, D. Fay, J. B. Fazekas, D. C. Fuls, A. R. Gibbs, A. D.
Grauer, H. Groeller, J. K. Hogan, R. A. Kowalski, S. M. Larson, G. J.
Leonard, D. Rankin, R. L. Seaman, A. Serrano, F. C. Shelly, K. W.
Wierzchos. 1.0-m prime focus + CCD.
T12 University of Hawaii 88-inch telescope, Maunakea. Observer D. J. Tholen.
2.24-m f/10.1 reflector + 2112 x 2112 pixels STA1600 10k CCD.
First and last observations above in comparison with prediction:
Residuals in seconds of arc (or two decimals in degrees), reference and Delta-T
230324 F52 0.06- 0.13- 230415 T12 0.11- 0.11- MPO740957 -0.19 days
Orbital elements:
2021 EG4 Earth MOID = 0.2950 AU
Epoch 2023 Feb. 25.0 TT = JDT 2460000.5 Veres
M 38.42549 (2000.0) P Q
n 0.50486380 Peri. 352.44987 +0.36063934 -0.88538758
a 1.5620199 Node 76.04390 +0.87076048 +0.20691638
e 0.6261245 Incl. 17.59141 +0.33423861 +0.41626248
P 1.95 H 21.18 G 0.15 U 1
Residuals in seconds of arc
210310 G96 0.2+ 0.3- 210313 L01 0.9- 0.9- 210405 V06 0.2+ 0.1-
210310 G96 0.4+ 0.1- 210313 033 0.2- 0.3- 210405 V06 0.1- 0.0
210310 G96 0.1- 0.5- 210313 033 0.8- 0.2+ 210405 V06 0.2- 0.4+
210310 G96 0.2+ 0.2+ 210314 033 0.1- 0.2+ 230324 F52 0.2+ 0.0
210311 I52 0.2+ 0.0 210315 J04 0.1+ 0.2+ 230324 F52 0.1- 0.1-
210311 I52 0.0 0.4+ 210315 J04 0.3- 0.4+ 230324 F52 0.1+ 0.1+
210311 I52 0.2+ 0.5- 210315 J04 0.1+ 0.1+ 230401 I52 0.1- 0.1-
210313 L01 0.2+ 0.4+ 210403 V06 0.4+ 0.0 230401 I52 0.1+ 0.1-
210313 L01 0.0 0.1+ 210403 V06 0.3+ 0.1- 230415 T12 0.0 0.0
210313 L01 0.6- 0.4- 210403 V06 0.1- 0.1- 230415 T12 0.0 0.0
Ephemeris:
2021 EG4 a,e,i = 1.56, 0.63, 18 q = 0.5840
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2023 04 07 14 45 16.4 +19 49 26 0.7303 1.6450 143.3 21.3 22.6
...
2023 04 22 14 05 12.9 +19 08 48 0.8237 1.7622 148.9 17.2 22.9
...
2023 04 30 13 47 36.0 +17 58 44 0.8960 1.8206 146.1 18.0 23.2
...
2023 05 06 13 36 48.9 +16 51 16 0.9597 1.8626 142.3 19.3 23.4
2023 05 07 13 35 13.6 +16 39 07 0.9711 1.8695 141.5 19.6 23.5
2023 05 08 13 33 41.8 +16 26 46 0.9826 1.8763 140.8 19.9 23.5
...
2023 05 14 13 25 44.5 +15 08 57 1.0560 1.9163 136.0 21.5 23.8
...
2023 05 22 13 18 12.8 +13 18 51 1.1635 1.9674 129.3 23.5 24.1
...
2023 06 06 13 12 08.9 +09 47 00 1.3884 2.0564 116.8 26.1 24.6
A. U. Tomatic (C) Copyright 2023 MPC M.P.E.C. 2023-J51
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