[Iaude] MPEC H55: 2021 LH9 [a=2.17,e=0.45,i=6.3,H=19.98]
mpec at cfa.harvard.edu
mpec at cfa.harvard.edu
Sun Apr 21 10:11:22 EDT 2024
M.P.E.C. 2024-H55 Issued 2024 April 21, 14:10 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 at CFA.HARVARD.EDU
URL https://www.minorplanetcenter.net/ ISSN 1523-6714
2021 LH9
Revision to MPEC 2021-M42
Additional Observations:
K21L09H 1C2018 11 07.40639 05 04 55.31 +33 03 01.3 VEH055G96
K21L09H 1C2018 11 07.41851 05 04 54.34 +33 02 59.2 21.6 GVEH055G96
K21L09H 0C2024 04 17.56104213 49 41.398-24 01 34.89 22.50GVEH055T12
K21L09H 0C2024 04 17.56470113 49 41.100-24 01 33.84 22.36GVEH055T12
K21L09H 0C2024 04 17.56836313 49 40.806-24 01 32.76 22.21GVEH055T12
K21L09H KC2024 04 20.31649313 46 01.760-23 47 51.80 22.02GVEH055V06
K21L09H KC2024 04 20.32850013 46 00.780-23 47 47.50 21.23GVEH055V06
K21L09H KC2024 04 20.34050613 45 59.680-23 47 43.90 21.12GVEH055V06
K21L09H KC2024 04 20.35251513 45 58.730-23 47 40.40 22.18GVEH055V06
Observer details:
G96 Mt. Lemmon Survey. Observer G. J. Leonard. Measurers B. Gray, D. Rankin,
F. C. Shelly. 1.5-m reflector + 10K 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.
V06 Catalina Sky Survey-Kuiper. Observer D. C. Fuls. Measurers T. Beuden, V.
F. Carvajal, 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, F. C. Shelly, K. W. Wierzchos. 1.55-m reflector +
1K CCD.
First and last observations above in comparison with prediction:
Residuals in seconds of arc, reference and Delta-T
181107 G96 4.6- 0.3- 240420 V06 2.6- 1.2- E2021-XD3 +0.05 days
Orbital elements:
2021 LH9 Earth MOID = 0.1907 AU
Epoch 2024 Mar. 31.0 TT = JDT 2460400.5 Veres
M 293.70335 (2000.0) P Q
n 0.30882847 Peri. 30.48430 +0.81113591 +0.57611702
a 2.1676600 Node 294.00057 -0.55638797 +0.70703495
e 0.4486501 Incl. 6.33086 -0.18025248 +0.41011067
P 3.19 H 19.98 G 0.15 U 0
Residuals in seconds of arc
181107 G96 (0.8- 0.6-) 210806 W46 0.0 0.1- 210909 F52 0.0 0.0
181107 G96 0.1- 0.6- 210806 W46 0.1+ 0.2- 210909 F52 0.0 0.0
210613 W94 0.9- 1.0- 210810 T08 0.1+ 0.1- 210909 F52 0.0 0.0
210613 W94 0.2+ 0.0 210810 T08 0.0 0.1- 210913 T05 0.3- 0.4+
210613 W94 0.5+ 1.1+ 210810 T08 0.0 0.3+ 210913 T05 0.1+ 0.0
210614 807 0.1- 0.1+ 210811 G17 0.2- 0.1+ 210913 T05 0.4+ 0.2+
210614 807 0.1- 0.1- 210811 G17 0.2- 0.2- 210913 T05 0.1- 0.4+
210616 Y00 0.5+ 0.2- 210811 G17 0.0 0.1- 210915 691 0.1- 0.2+
210616 Y00 0.0 0.2- 210815 160 0.5- 1.4- 210915 691 0.0 0.4-
210616 Y00 0.4- 0.2+ 210815 160 0.8- 1.3- 210924 A17 0.0 0.0
210617 W95 0.2- 0.2- 210815 160 0.4+ 0.7- 210924 A17 0.1+ 0.0
210617 W95 0.2+ 0.2- 210818 T08 0.3+ 0.1- 210924 A17 0.2- 0.1-
210617 W95 0.1+ 0.1+ 210818 T08 0.3+ 0.1- 210925 G96 0.0 0.1+
210617 E94 0.3+ 0.5- 210818 T08 0.1+ 0.2+ 210925 G96 0.1- 0.2+
210617 E94 0.4+ 1.1+ 210824 Z80 0.6+ 0.6- 210925 G96 (0.4- 0.6-)
210617 E94 (1.1+ 3.6+) 210824 Z80 0.2+ 0.7- 210925 F52 0.0 0.1+
210617 E94 0.5+ 0.6- 210825 691 0.1- 0.2- 210925 F52 0.0 0.1+
210617 L81 0.4+ 0.4+ 210825 691 0.0 0.0 210925 F52 0.0 0.1+
210617 L81 0.8+ 0.1- 210825 691 0.2+ 0.1+ 210925 F52 0.0 0.1+
210619 I52 0.2- 0.2- 210825 595 0.2- 0.2- 210928 I41 0.0 0.0
210619 I52 0.2- 0.5- 210825 160 0.7- 0.8+ 210928 I41 0.3+ 0.1-
210619 I52 0.3- 0.2- 210825 160 0.2- 0.6+ 210928 I41 0.2- 0.0
210619 I52 0.1+ 0.2- 210825 160 0.2- 0.6+ 210928 T08 0.3- 1.0-
210627 I52 0.2- 0.2+ 210825 595 0.3- 0.4+ 210928 T08 0.3+ 0.4-
210627 I52 0.1- 0.0 210828 W34 0.1- 0.2- 210928 T08 0.6- 0.5-
210627 I52 0.0 0.8- 210828 W34 0.1- 0.0 210928 T08 0.4- 1.5+
210628 807 0.4+ 0.1- 210828 W34 0.4- 0.5+ 210930 I41 0.0 0.1+
210628 807 0.2+ 0.0 210828 T05 0.6- 0.5+ 210930 I41 0.1+ 0.0
210628 807 0.2+ 0.6+ 210828 T05 0.0 0.3- 211003 T05 0.0 0.2+
210703 W88 0.8+ 0.3+ 210828 T05 0.1+ 0.1- 211003 T05 0.0 0.1-
210703 W88 0.2- 0.8+ 210828 T05 0.2+ 0.1+ 211003 T05 0.8- 0.3-
210703 W88 0.3+ 0.1- 210828 160 0.1- 0.3+ 211003 T05 0.6- 0.0
210715 W88 0.1- 0.0 210828 160 0.1- 0.3+ 211004 D29 0.3- 0.6-
210715 W88 0.6- 0.4- 210828 160 0.0 0.0 211004 D29 0.1- 0.1+
210715 807 0.2+ 0.4- 210831 K87 (1.7- 0.2+) 211004 D29 0.1+ 0.2-
210715 807 0.0 0.2- 210831 K87 (1.8- 0.1-) 211008 K87 (0.0 1.2+)
210715 807 0.0 0.2- 210831 K87 (1.7- 0.2-) 211008 K87 0.0 0.7+
210727 L81 0.4- 0.0 210901 K87 0.8- 0.3- 211008 K87 0.3+ 0.2+
210727 L81 0.0 0.0 210901 K87 1.1- 0.0 211010 691 0.2- 0.4-
210727 L81 0.2- 0.1+ 210901 K87 (1.9- 0.3+) 211010 691 0.2+ 0.1-
210728 H36 0.3- 1.1- 210901 160 0.1- 0.4+ 211025 691 0.0 0.2-
210728 H36 0.3- 0.2+ 210901 160 0.1+ 0.1+ 211025 691 0.7- 0.5-
210730 T05 0.3- 0.7+ 210901 160 0.2+ 0.3- 211109 G96 0.2- 0.0
210730 T05 0.4- 0.3+ 210903 Z80 0.1+ 0.2- 211109 G96 0.2- 0.0
210730 T05 0.1- 0.7+ 210903 Z80 0.4- 0.0 211109 G96 (0.5- 0.7-)
210730 T05 0.3- 0.2+ 210904 K87 0.1+ 0.2- 211109 G96 0.1+ 0.1-
210802 T08 0.1- 0.0 210904 K87 0.0 0.3- 211112 291 0.0 0.2-
210802 T08 0.0 0.1+ 210904 K87 1.2- 0.7- 211112 291 0.8+ 0.3-
210802 T08 0.2+ 0.0 210905 K87 0.2- 0.6- 211112 291 0.1+ 0.0
210803 T05 0.0 0.1- 210905 K87 1.1- 0.5+ 240417 T12 0.1+ 0.1-
210803 T05 0.0 0.1+ 210905 K87 1.3- 0.7- 240417 T12 0.1+ 0.1-
210803 T05 0.4+ 0.1+ 210907 T08 0.2+ 0.4+ 240417 T12 0.1+ 0.1-
210804 734 0.2+ 0.5- 210907 T08 0.1+ 0.1+ 240420 V06 0.1+ 0.2+
210804 734 0.3+ 0.2+ 210907 T08 0.4+ 0.3- 240420 V06 0.5+ 0.6+
210804 734 0.1+ 0.0 210907 T08 0.2- 0.2+ 240420 V06 0.7- 0.3+
210804 734 0.1- 0.1+ 210908 L38 0.1- 0.2- 240420 V06 0.1+ 0.1-
210804 734 0.2- 0.2+ 210908 L38 (0.7- 0.9-)
210806 W46 0.1+ 0.2- 210908 L38 0.6- 0.0
Ephemeris:
2021 LH9 a,e,i = 2.17, 0.45, 6 q = 1.1951
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2024 03 22 14 14 58.8 -24 27 40 1.3862 2.2473 140.7 16.3 23.3
...
2024 04 06 14 03 23.3 -24 35 41 1.2161 2.1702 156.4 10.7 22.8
...
2024 04 14 13 54 15.0 -24 16 06 1.1458 2.1279 164.0 7.5 22.5
...
2024 04 20 13 46 27.4 -23 49 27 1.1034 2.0957 167.6 5.9 22.3
2024 04 21 13 45 06.4 -23 44 02 1.0972 2.0903 167.8 5.8 22.2
2024 04 22 13 43 44.8 -23 38 20 1.0913 2.0849 167.9 5.8 22.2
...
2024 04 28 13 35 28.2 -22 58 46 1.0610 2.0521 165.9 6.9 22.2
...
2024 05 06 13 24 40.2 -21 53 45 1.0346 2.0078 158.6 10.6 22.2
...
2024 05 21 13 08 14.0 -19 34 20 1.0238 1.9230 141.7 19.1 22.4
A. U. Tomatic (C) Copyright 2024 MPC M.P.E.C. 2024-H55
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