MPEC 2020-H93 : 2007 HL4
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M.P.E.C. 2020-H93 Issued 2020 April 22, 11:55 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
2007 HL4
Revision to MPEC 2007-H24
Additional Observations:
K07H04L C2019 12 04.51669007 23 47.488+53 48 27.66 21.9 GVEH093F52
K07H04L C2019 12 04.53096707 23 48.161+53 49 10.04 21.9 GVEH093F52
K07H04L C2019 12 04.54524007 23 48.827+53 49 52.72 22.1 GVEH093F52
K07H04L C2019 12 04.55949807 23 49.495+53 50 34.58 22.0 GVEH093F52
K07H04L C2020 01 26.25493705 07 32.430+83 48 50.56 22.2 GVEH093F51
K07H04L C2020 01 26.26853905 07 24.199+83 48 53.28 20.8 GVEH093F51
K07H04L C2020 01 26.28214005 07 16.195+83 48 56.51 21.7 GVEH093F51
K07H04L C2020 04 21.20544 10 07 02.21 +17 19 06.9 20.3 GVEH093G96
K07H04L C2020 04 21.21058 10 07 02.77 +17 18 27.7 20.1 GVEH093G96
K07H04L C2020 04 21.21572 10 07 03.36 +17 17 48.4 20.4 GVEH093G96
K07H04L C2020 04 21.22085 10 07 03.95 +17 17 09.2 20.4 GVEH093G96
K07H04L C2020 04 21.33600 10 07 18.51 +17 02 22.6 20.2 GVEH093I52
K07H04L C2020 04 21.33721 10 07 18.71 +17 02 13.5 20.2 GVEH093I52
K07H04L C2020 04 21.33841 10 07 18.89 +17 02 04.2 20.4 GVEH093I52
K07H04L KC2020 04 21.80475810 08 39.93 +16 03 23.2 20.5 GVEH093L01
K07H04L KC2020 04 21.80652410 08 40.15 +16 03 09.6 20.6 GVEH093L01
K07H04L IC2020 04 21.80872210 08 40.46 +16 02 52.8 20.6 GVEH093L01
K07H04L C2020 04 21.82394 10 08 42.52 +16 00 47.2 19.7 VVEH093033
K07H04L C2020 04 21.82562 10 08 42.73 +16 00 34.6 19.6 VVEH093033
K07H04L C2020 04 21.82729 10 08 42.90 +16 00 22.3 19.8 VVEH093033
K07H04L C2020 04 21.82913 10 08 43.16 +16 00 08.2 19.7 VVEH093033
K07H04L C2020 04 21.83089 10 08 43.09 +15 59 58.3 VEH093246
K07H04L C2020 04 21.83132 10 08 43.16 +15 59 55.8 VEH093246
K07H04L C2020 04 21.83156 10 08 43.19 +15 59 54.0 VEH093246
K07H04L C2020 04 21.83181 10 08 43.19 +15 59 52.8 VEH093246
K07H04L C2020 04 21.83253 10 08 43.33 +15 59 46.9 VEH093246
K07H04L C2020 04 21.83350 10 08 43.41 +15 59 38.8 VEH093246
K07H04L KC2020 04 21.90113810 08 53.37 +15 51 05.4 20.4 GVEH093J95
K07H04L KC2020 04 21.90520210 08 53.84 +15 50 35.1 19.7 GVEH093J95
K07H04L KC2020 04 21.90931810 08 54.43 +15 50 03.7 20.1 GVEH093J95
K07H04L KC2020 04 22.07231510 09 23.02 +15 30 04.8 20.4 VuEH093H21
K07H04L KC2020 04 22.07522310 09 23.37 +15 29 42.9 20.7 VuEH093H21
K07H04L KC2020 04 22.07803210 09 23.68 +15 29 21.6 20.4 VuEH093H21
K07H04L KC2020 04 22.08006610 09 23.91 +15 29 06.3 20.6 VuEH093H21
K07H04L C2020 04 22.16353 10 09 36.18 +15 18 55.0 20.9 GVEH093I52
K07H04L C2020 04 22.16430 10 09 36.24 +15 18 48.7 20.7 GVEH093I52
K07H04L C2020 04 22.16507 10 09 36.34 +15 18 43.3 20.4 GVEH093I52
K07H04L C2020 04 22.16584 10 09 36.42 +15 18 37.5 20.4 GVEH093I52
Observer details:
033 Karl Schwarzschild Observatory, Tautenburg. Observers S. Melnikov, C.
Hoegner, B. Stecklum. Measurer B. Stecklum. 1.34-m f/3 Schmidt + CCD.
246 Klet Observatory-KLENOT. Observers M. Tichy, J. Ticha. Measurer M. Tichy.
1.06-m f/2.7 reflector + 2048x2048 CCD.
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.
F52 Pan-STARRS 2, Haleakala. Observers J. Bulger, K. Chambers, T. Dukes, T.
Lowe, A. Schultz, M. Willman. Measurers S. Chastel, M. Huber, Y.
Ramanjooloo, R. Wainscoat, R. Weryk. 1.8-m Ritchey-Chretien + CCD.
G96 Mt. Lemmon Survey. Observer G. J. Leonard. 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. 1.5-m reflector + 10K CCD.
H21 Astronomical Research Observatory, Westfield. Observer R. Holmes.
Measurers S. Foglia, L. Buzzi, T. Linder, R. Holmes. 0.76-m f/3.0
astrograph + CCD.
I52 Steward Observatory, Mt. Lemmon Station. Observers D. C. Fuls, H.
Groeller. 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.
J95 Great Shefford. Observer P. Birtwhistle. 0.41-m f/6.3 Schmidt-Cassegrain
+ CCD.
L01 Visnjan Observatory, Tican. Observer K. Korlevic. 1.0-m f/2.9 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
191204 F52 10- 5- 200422 I52 35- 21- MPO119740 -2.13 days
Orbital elements:
2007 HL4 Earth MOID = 0.0325 AU
Epoch 2020 May 31.0 TT = JDT 2459000.5 Veres
M 64.79235 (2000.0) P Q
n 0.83155064 Peri. 139.22318 -0.98329483 -0.17230820
a 1.1199799 Node 31.00235 +0.12283157 -0.86598296
e 0.0907427 Incl. 6.53957 +0.13432676 -0.46945011
P 1.19 H 24.1 G 0.15 U 2
Residuals in seconds of arc
070419 G96 0.3- 0.1+ 070420 G96 0.2+ 0.2+ 200421 L01 0.4- 0.4-
070419 G96 0.2- 0.1+ 070420 G96 0.3- 0.0 200421 L01 0.3+ 0.7-
070419 G96 0.0 0.1+ 070420 G96 0.1- 0.5+ 200421 033 0.3- 0.7-
070419 G96 0.2+ 0.3+ 070422 704 0.7- 1.7+ 200421 033 0.2- 0.6-
070419 G96 0.1- 0.2- 070422 704 0.8+ 0.5+ 200421 033 0.7- 0.4-
070419 G96 0.0 0.2+ 070422 704 0.2- 1.3+ 200421 033 0.2- 0.6-
070419 G96 0.1- 0.0 070422 704 1.3- 1.1+ 200421 246 0.0 1.0-
070419 G96 0.0 0.0 070422 704 2.1+ 0.4- 200421 246 0.3+ 0.3-
070419 G96 0.1- 0.0 191204 F52 0.2+ 0.0 200421 246 0.3+ 0.3-
070419 G96 0.1- 0.3- 191204 F52 0.2+ 0.3- 200421 246 0.2- 0.4+
070419 G96 0.1- 0.2+ 191204 F52 0.2+ 0.1+ 200421 246 0.6+ 0.0
070419 G96 0.0 0.3+ 191204 F52 0.1+ 0.0 200421 246 0.1+ 0.8-
070419 595 1.0+ 0.4+ 200126 F51 0.1- 0.2+ 200421 J95 0.2- 0.1+
070419 595 0.4- 0.2+ 200126 F51 0.2- 0.2- 200421 J95 0.7- 0.6+
070420 J95 0.5+ 0.6- 200126 F51 0.0 0.3+ 200421 J95 0.3+ 0.4+
070420 J95 0.5- 0.0 200421 G96 0.3+ 0.3- 200422 H21 0.1+ 0.0
070420 H36 1.7- 0.9- 200421 G96 0.1- 0.2- 200422 H21 0.4+ 0.1-
070420 H36 0.2+ 0.5+ 200421 G96 0.0 0.3- 200422 H21 0.2+ 0.3-
070420 H36 0.2+ 0.3- 200421 G96 0.0 0.3- 200422 H21 0.1+ 0.4-
070420 854 0.3+ 0.2+ 200421 I52 0.3- 0.3- 200422 I52 0.2+ 0.4-
070420 854 0.2- 0.5+ 200421 I52 0.2+ 0.0 200422 I52 0.2- 0.9-
070420 854 1.1+ 0.5+ 200421 I52 0.3+ 0.0 200422 I52 0.0 0.5-
070420 G96 0.0 0.0 200421 L01 0.6- 0.1- 200422 I52 0.0 0.5-
Ephemeris:
2007 HL4 a,e,i = 1.12, 0.09, 7 q = 1.0183
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2020 03 23 08 32 23.7 +66 10 20 0.08597 1.0191 102.7 72.6 21.4
...
2020 04 07 09 26 50.7 +45 47 12 0.07009 1.0255 108.6 67.7 20.8
...
2020 04 15 09 50 18.6 +30 22 30 0.06620 1.0311 113.1 63.5 20.5
...
2020 04 21 10 06 32.2 +17 45 42 0.06675 1.0361 116.2 60.5 20.5
2020 04 22 10 09 10.9 +15 40 06 0.06716 1.0370 116.6 60.1 20.5
2020 04 23 10 11 49.1 +13 35 37 0.06767 1.0380 117.0 59.7 20.5
...
2020 04 29 10 27 32.2 +01 48 34 0.07255 1.0440 118.8 57.7 20.6
...
2020 05 07 10 48 30.1 -11 18 02 0.08334 1.0529 119.8 56.3 20.9
...
2020 05 22 11 29 00.3 -27 32 34 0.1128 1.0721 119.3 55.4 21.5
A. U. Tomatic (C) Copyright 2020 MPC M.P.E.C. 2020-H93
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