MPEC 2021-H120 : 2021 HW2
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M.P.E.C. 2021-H120 Issued 2021 April 22, 16:35 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
2021 HW2
Observations:
K21H02W C2021 04 17.29148 13 16 56.60 +29 55 45.4 22.2 GVEH120G96
K21H02W C2021 04 17.29731 13 16 58.98 +29 54 33.2 21.9 GVEH120G96
K21H02W C2021 04 17.30316 13 17 01.33 +29 53 18.9 22.5 GVEH120G96
K21H02W C2021 04 18.36989 13 27 25.93 +25 20 02.9 21.3 GVEH120G96
K21H02W C2021 04 18.38694 13 27 35.64 +25 14 39.2 21.4 GVEH120G96
K21H02W* C2021 04 20.25083 13 57 40.55 +10 13 41.0 19.6 GVEH120U68
K21H02W C2021 04 20.25471 13 57 45.02 +10 10 56.1 19.6 GVEH120U68
K21H02W C2021 04 20.28233 13 58 17.36 +09 50 58.4 20.0 GVEH120U68
K21H02W C2021 04 20.28621 13 58 21.94 +09 48 09.9 20.0 GVEH120U68
K21H02W C2021 04 21.19671 14 23 04.17 -03 58 34.0 19.5 GVEH120U68
K21H02W C2021 04 21.20059 14 23 11.15 -04 02 47.0 19.5 GVEH120U68
K21H02W C2021 04 21.30386 14 26 20.42 -05 59 04.5 19.1 GVEH120U68
K21H02W C2021 04 21.30773 14 26 27.45 -06 03 28.5 19.1 GVEH120U68
K21H02W KC2021 04 22.02221314 55 08.10 -21 21 18.8 19.9 GVEH120J95
K21H02W KC2021 04 22.04197914 56 00.96 -21 48 48.2 VEH120J95
K21H02W HC2021 04 22.04761114 56 16.06 -21 56 38.7 20.0 GVEH120J95
Observer details:
G96 Mt. Lemmon Survey. Observer K. W. Wierzchos. Measurers B. Gray, D.
Rankin, F. C. Shelly. 1.5-m reflector + 10K CCD.
J95 Great Shefford. Observer P. Birtwhistle. 0.41-m f/6.3 Schmidt-Cassegrain
+ CCD.
U68 JPL SynTrack Robotic Telescope, Auberry. Observers N. Saini, C. Zhai, R.
Trahan, M. Zhan, M. Shao. 0.28-m f/2.2 Schmidt + CCD.
Orbital elements:
2021 HW2 Earth MOID = 0.0102 AU
Epoch 2020 Dec. 17.0 TT = JDT 2459200.5 Veres
M 313.97186 (2000.0) P Q
n 0.32926560 Peri. 196.72598 -0.66561866 +0.73896266
a 2.0770095 Node 31.77448 -0.66002513 -0.51764573
e 0.5169668 Incl. 11.42821 -0.34830825 -0.43125061
P 2.99 H 28.12 G 0.15 U 8
Residuals in seconds of arc
210417 G96 0.6- 0.3- 210420 U68 0.6- 0.0 210421 U68 (3.5- 8.6+)
210417 G96 0.2+ 0.5+ 210420 U68 0.1+ 0.5- 210422 J95 0.1+ 0.3+
210417 G96 0.4+ 0.2- 210420 U68 0.7+ 0.6+ 210422 J95 0.3+ 0.1-
210418 G96 (3.0+ 5.7-) 210421 U68 (3.0- 4.2+) 210422 J95 0.3- 0.3-
210418 G96 (1.0+ 3.1-) 210421 U68 (4.9- 7.8+)
210420 U68 (0.4+ 1.9-) 210421 U68 (2.1- 5.9+)
Ephemeris:
2021 HW2 a,e,i = 2.08, 0.52, 11 q = 1.0033
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2021 03 23 12 30 45.1 +42 22 09 0.1805 1.1342 136.4 37.3 26.2
...
2021 04 07 12 41 06.7 +41 47 21 0.09115 1.0632 131.2 45.1 24.8
...
2021 04 15 13 02 06.0 +35 33 48 0.04518 1.0352 134.2 44.0 23.2
...
2021 04 21 14 16 30.9 -00 24 16 0.01511 1.0196 167.4 12.4 19.8
2021 04 22 14 53 59.2 -20 38 36 0.01283 1.0175 164.2 15.6 19.6
2021 04 23 15 54 21.4 -43 26 52 0.01300 1.0155 140.7 38.8 20.3
...
2021 04 29 22 36 29.6 -61 42 27 0.04012 1.0065 88.2 89.5 24.3
...
2021 05 07 23 36 45.2 -55 30 24 0.08469 1.0030 83.5 91.7 26.0
...
2021 05 22 23 58 28.0 -52 07 38 0.1650 1.0221 88.8 81.9 27.1
M. P. C. Staff (C) Copyright 2021 MPC M.P.E.C. 2021-H120
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