MPEC 2021-C108 : 2020 HW1
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M.P.E.C. 2021-C108 Issued 2021 February 9, 01:44 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
2020 HW1
Revision to MPEC 2020-H64
Additional Observations:
K20H01W C2017 12 30.53352910 05 13.748-17 17 31.40 21.27GVEC108F51
K20H01W C2017 12 30.54457410 05 12.398-17 17 25.09 21.67GVEC108F51
K20H01W C2017 12 30.56664710 05 09.733-17 17 11.97 22.14GVEC108F51
K20H01W C2018 01 01.54071310 01 13.174-16 56 45.03 21.79GVEC108F51
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.
First and last observations above in comparison with prediction:
Residuals in seconds of arc (or two decimals in degrees), reference and Delta-T
171230 F51 0.05- 0.10- 180101 F51 0.06- 0.10- MPO546170 -0.00 days
Orbital elements:
2020 HW1 Earth MOID = 0.3593 AU
Epoch 2020 Dec. 17.0 TT = JDT 2459200.5 Veres
M 57.64057 (2000.0) P Q
n 0.35599849 Peri. 185.27426 +0.98336277 +0.14951976
a 1.9716838 Node 164.89612 -0.14880844 +0.98875824
e 0.7963524 Incl. 23.32164 -0.10418111 -0.00099264
P 2.77 H 19.4 G 0.15 U 2
Residuals in seconds of arc
171230 F51 0.2+ 0.0 200425 I41 0.1- 0.8+ 200504 H21 0.1+ 0.0
171230 F51 0.0 0.2- 200425 I41 0.1- 0.8+ 200505 G96 0.1+ 0.3-
171230 F51 0.2+ 0.0 200425 I41 0.1- 0.7+ 200505 G96 0.1+ 0.2-
180101 F51 0.3- 0.1+ 200425 I41 0.3+ 0.6+ 200505 G96 0.0 0.2-
200416 F51 0.1- 0.3+ 200425 A17 0.5+ 0.1+ 200505 G96 0.4+ 0.3-
200416 F51 0.1- 0.1+ 200425 A17 0.1+ 0.1- 200506 A17 0.5- 0.3-
200418 G96 0.2+ 0.1+ 200426 A17 0.2- 0.5+ 200506 A17 0.5- 0.1+
200418 G96 0.3- 0.2- 200426 I52 0.2+ 0.1- 200506 A17 0.3- 0.4-
200418 G96 0.1+ 0.2- 200426 I52 0.1+ 0.1- 200509 H21 0.1+ 0.0
200418 G96 0.3+ 0.3+ 200426 I52 0.2+ 0.1- 200509 H21 0.3- 0.1-
200418 I52 0.2- 1.0- 200426 I52 0.1+ 0.1- 200509 H21 0.2- 0.0
200418 I52 0.6- 0.3- 200427 I52 0.6+ 1.1- 200509 H21 0.2- 0.1-
200418 I52 0.0 0.5- 200427 I52 0.1- 0.0 200509 H36 0.4- 0.8+
200418 F51 0.1+ 0.1- 200427 I52 0.5+ 0.2- 200509 H36 0.2+ 0.5+
200418 F51 0.1+ 0.1- 200428 I52 0.1+ 0.3+ 200509 H36 0.1+ 0.0
200418 F51 0.1+ 0.1+ 200428 I52 0.3- 0.3- 200509 H36 0.1+ 0.2+
200418 F51 0.0 0.0 200428 I52 0.4+ 0.0 200512 G96 0.3- 0.4+
200419 I52 0.0 0.4- 200428 I52 0.3+ 0.2- 200512 G96 0.1- 0.5-
200419 I52 0.2- 0.1+ 200502 703 (2.5- 0.1+) 200512 G96 0.1- 0.1-
200419 I52 0.0 0.1+ 200502 703 (1.6- 0.9+) 200512 G96 0.0 0.2-
200419 F51 0.1+ 0.0 200502 703 1.3+ 0.4- 200512 F51 0.1- 0.0
200419 F51 0.0 0.1+ 200503 I52 0.3+ 0.0 200512 F51 0.0 0.4+
200419 033 0.2- 0.3- 200503 I52 0.3- 0.3- 200512 F51 0.1- 0.4+
200419 033 0.2- 0.2- 200503 I52 0.2- 0.1- 200513 I52 0.1+ 0.1-
200419 033 0.2- 0.3- 200503 I52 0.2+ 0.1- 200513 I52 0.2+ 0.0
200420 H21 0.0 0.1- 200503 204 0.6- 0.3+ 200513 I52 0.2+ 0.1-
200420 H21 0.1+ 0.0 200504 204 0.0 0.1+ 200513 I52 0.0 0.2-
200420 H21 0.2- 0.2+ 200504 L01 0.1+ 0.0 200514 F51 0.1+ 0.2+
200420 H21 0.4- 0.2- 200504 L01 0.0 0.1+ 200514 F51 0.1+ 0.3-
200420 A17 0.3- 0.3+ 200504 L01 0.3- 0.3- 200515 I52 0.1- 0.4-
200420 A17 0.7- 0.4- 200504 H21 0.1- 0.1+ 200515 I52 0.2- 0.2-
200420 A17 0.5- 0.3+ 200504 H21 0.1+ 0.0 200515 I52 0.1+ 0.2-
200424 A17 0.1- 0.6- 200504 H21 0.2+ 0.1- 200515 I52 0.1+ 0.1-
200424 A17 0.1- 0.1- 200504 H21 0.2+ 0.0 200520 I52 0.0 0.3-
200424 A17 0.7- 0.2- 200504 H21 0.2+ 0.0 200520 I52 0.0 0.1-
200424 I52 0.3+ 0.2- 200504 H21 0.0 0.3- 200520 I52 0.2+ 0.3-
200424 I52 0.1+ 0.2- 200504 H21 0.1+ 0.0 200520 I52 0.1- 0.3-
200424 I52 0.4+ 0.0 200504 H21 0.0 0.1+
Ephemeris:
2020 HW1 a,e,i = 1.97, 0.80, 23 q = 0.4015
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2021 01 10 10 42 17.7 -04 25 20 1.7911 2.4895 125.0 18.9 23.6
...
2021 01 25 10 25 44.4 -02 32 37 1.7325 2.5952 144.1 12.8 23.4
...
2021 02 02 10 14 52.2 -01 10 17 1.7247 2.6486 154.5 9.2 23.3
...
2021 02 08 10 06 13.5 -00 00 55 1.7320 2.6874 162.0 6.5 23.2
2021 02 09 10 04 46.0 +00 11 08 1.7344 2.6937 163.1 6.1 23.2
2021 02 10 10 03 18.3 +00 23 17 1.7371 2.7001 164.2 5.7 23.2
...
2021 02 16 09 54 35.6 +01 37 52 1.7608 2.7374 169.2 3.9 23.2
...
2021 02 24 09 43 29.8 +03 18 37 1.8119 2.7856 167.2 4.5 23.3
...
2021 03 11 09 26 04.8 +06 15 08 1.9650 2.8710 150.4 9.8 23.8
A. U. Tomatic (C) Copyright 2021 MPC M.P.E.C. 2021-C108
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