MPEC 2021-C98 : 2018 EH4
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M.P.E.C. 2021-C98 Issued 2021 February 9, 00:32 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
2018 EH4
Revision to MPEC 2018-F5
Additional Observations:
K18E04H C2015 04 10.29947908 24 45.590+22 08 19.00 23.66GVEC098F51
K18E04H C2015 04 10.31128608 24 48.674+22 08 00.85 21.95GVEC098F51
K18E04H C2015 04 10.33489008 24 54.700+22 07 25.69 23.01GVEC098F51
K18E04H C2020 08 13.36758821 39 41.656-24 03 18.64 23.42GVEC098F51
K18E04H C2020 08 13.38820921 39 39.201-24 03 29.28 22.87GVEC098F51
K18E04H C2020 08 13.39852521 39 38.013-24 03 34.18 22.91GVEC098F51
K18E04H C2020 09 08.25887220 43 57.044-26 15 26.92 24.04GVEC098F51
K18E04H C2020 09 08.26919720 43 55.715-26 15 27.38 23.74GVEC098F51
K18E04H C2020 09 15.24792620 30 26.827-26 09 37.92 23.46GVEC098F51
K18E04H C2020 09 15.25941020 30 25.532-26 09 35.89 22.95GVEC098F51
K18E04H C2021 02 08.56124814 18 52.18 +18 21 06.2 19.70cVEC098T08
K18E04H C2021 02 08.56313414 18 50.85 +18 21 03.6 19.77cVEC098T08
K18E04H C2021 02 08.56743214 18 48.06 +18 20 57.3 19.55cVEC098T08
K18E04H C2021 02 08.57268814 18 44.62 +18 20 50.3 19.56cVEC098T08
Observer details:
F51 Pan-STARRS 1, Haleakala. Observers J. Bulger, K. Chambers, T. Lowe, A.
Schultz, M. Willman. Measurers S. Chastel, M. Huber, Y. Ramanjooloo, R.
Wainscoat, R. Weryk. 1.8-m Ritchey-Chretien + CCD.
T08 ATLAS-MLO, Mauna Loa. Observers L. Denneau, J. Tonry, A. Heinze, H.
Weiland. Measurers L. Denneau, J. Tonry, A. Heinze, H. Weiland, H.
Flewelling, A. Fitzsimmons, J. Robinson, N. Erasmus. 0.5-m reflector +
CCD.
First and last observations above in comparison with prediction:
Residuals in seconds of arc (or zero decimals in degrees), reference and Delta-T
150410 F51 17- 6- 210208 T08 150- 15- MPO439040 +13.4 days
Orbital elements:
2018 EH4 PHA, Earth MOID = 0.0243 AU
Epoch 2020 Dec. 17.0 TT = JDT 2459200.5 Veres
M 357.62853 (2000.0) P Q
n 0.33315613 Peri. 75.22955 +0.20633751 -0.97846591
a 2.0608079 Node 2.87920 +0.85119272 +0.17676484
e 0.6122459 Incl. 6.18538 +0.48259278 +0.10657697
P 2.96 H 21.7 G 0.15 U 0
Residuals in seconds of arc
150410 F51 0.3- 0.1+ 180314 734 0.4- 0.3- 180316 I52 0.0 0.5-
150410 F51 0.4+ 0.3- 180314 734 0.0 0.3- 180318 F51 0.3- 0.2+
150410 F51 0.2- 0.1+ 180314 H21 0.2+ 0.0 180318 F51 0.3- 0.0
180302 F51 0.1- 0.2- 180314 734 1.0+ 0.1- 180318 F51 0.1- 0.1+
180302 F51 0.1- 0.2+ 180314 H21 0.0 0.2+ 180318 I52 0.2- 0.6-
180302 F51 0.0 0.1+ 180314 H21 0.0 0.0 180318 I52 0.1- 0.8-
180313 G96 0.2- 0.3+ 180314 P93 0.7+ 1.5- 180318 I52 0.1- 0.2+
180313 G96 0.1- 0.1+ 180314 P93 0.5- 0.1+ 180319 I52 0.3+ 0.5+
180313 G96 0.1- 0.2- 180314 P93 0.4+ 0.3- 180319 I52 0.0 0.3+
180313 G96 0.3- 0.0 180314 587 1.4+ 0.9- 180319 I52 0.6+ 0.9+
180313 204 0.2- 0.0 180314 587 1.1+ 0.5- 180320 I52 0.2+ 0.5+
180313 204 0.2- 0.3+ 180314 587 0.7+ 0.5- 180320 I52 0.1- 0.0
180313 J04 0.1- 0.2- 180314 K51 0.0 0.3+ 180320 I52 0.1- 0.0
180313 J04 0.0 0.1+ 180314 K51 0.2- 0.1- 180320 I52 0.4+ 0.3+
180313 J04 0.4- 0.2+ 180314 K51 0.1- 0.2+ 200813 F51 0.1+ 0.0
180313 204 0.2+ 0.1+ 180314 J04 0.2- 0.3+ 200813 F51 0.4- 0.2-
180313 J95 0.4+ 0.2+ 180314 J04 0.0 0.6+ 200813 F51 0.0 0.0
180313 J95 0.2+ 0.6- 180314 J04 0.1+ 0.1+ 200908 F51 0.1+ 0.0
180313 K88 0.1+ 0.4+ 180315 033 0.0 0.0 200908 F51 0.2+ 0.0
180313 K88 0.1+ 0.5+ 180315 033 0.2- 0.1+ 200915 F51 0.1+ 0.2-
180313 K88 0.2+ 0.7+ 180315 033 0.1- 0.0 200915 F51 0.0 0.5+
180314 I52 0.2- 0.2- 180315 033 0.1+ 0.1+ 210208 T08 0.6+ 0.3-
180314 I52 0.5- 0.1+ 180316 I52 0.0 0.1- 210208 T08 0.7- 0.1-
180314 I52 0.2- 0.1+ 180316 I52 0.1+ 0.0 210208 T08 0.2- 0.1-
180314 I52 0.4- 0.2+ 180316 I52 0.2- 0.1- 210208 T08 0.1+ 0.7+
Ephemeris:
2018 EH4 a,e,i = 2.06, 0.61, 6 q = 0.7991
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2021 01 10 20 01 48.9 +09 26 29 0.1794 0.8380 32.7 140.7 24.5
...
2021 01 25 17 33 02.9 +19 41 30 0.1192 0.9268 58.0 115.8 21.5
...
2021 02 02 15 38 46.5 +20 33 47 0.1193 0.9878 87.7 85.4 20.1
...
2021 02 08 14 24 51.1 +18 35 23 0.1337 1.0376 109.0 64.0 19.7
2021 02 09 14 14 15.2 +18 09 57 0.1370 1.0462 112.2 60.8 19.7
2021 02 10 14 04 08.9 +17 43 56 0.1406 1.0548 115.4 57.7 19.6
...
2021 02 16 13 13 02.2 +15 09 12 0.1668 1.1077 132.6 41.0 19.6
...
2021 02 24 12 25 02.5 +12 16 47 0.2124 1.1802 151.3 23.8 19.8
...
2021 03 11 11 33 15.0 +08 48 24 0.3268 1.3190 174.6 4.1 20.2
A. U. Tomatic (C) Copyright 2021 MPC M.P.E.C. 2021-C98
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