MPEC 2021-H23 : 2021 HC
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M.P.E.C. 2021-H23 Issued 2021 April 17, 01:52 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 HC
Observations:
K21H00C* C2021 04 16.19601 13 07 22.41 +15 51 06.3 19.9 GVEH023U68
K21H00C C2021 04 16.19989 13 07 23.81 +15 49 19.1 19.9 GVEH023U68
K21H00C C2021 04 16.22667 13 07 33.51 +15 36 47.3 19.9 GVEH023U68
K21H00C C2021 04 16.23054 13 07 34.83 +15 35 00.4 19.9 GVEH023U68
K21H00C KC2021 04 16.89079213 12 03.29 +10 30 16.1 19.4 GVEH023J95
K21H00C KC2021 04 16.89348713 12 04.23 +10 29 03.6 19.6 GVEH023J95
K21H00C KC2021 04 16.89621413 12 05.12 +10 27 49.9 19.5 GVEH023J95
K21H00C KC2021 04 16.90136613 12 06.89 +10 25 32.2 19.8 GVEH023J95
K21H00C KC2021 04 16.92725713 12 13.93 +10 14 21.8 19.5 GVEH023K63
K21H00C KC2021 04 16.93199213 12 15.47 +10 12 13.9 20.3 GVEH023K63
K21H00C KC2021 04 16.93680013 12 16.94 +10 10 04.5 19.6 GVEH023K63
K21H00C KC2021 04 16.94716513 12 21.87 +10 04 56.8 20.2 GVEH023Z99
K21H00C KC2021 04 16.95125013 12 23.19 +10 03 07.1 20.1 GVEH023Z99
K21H00C KC2021 04 16.95533613 12 24.56 +10 01 18.1 19.9 GVEH023Z99
K21H00C KC2021 04 16.98306913 12 31.20 +09 49 18.7 19.7 GVEH023L01
K21H00C KC2021 04 16.98425913 12 31.60 +09 48 46.8 19.8 GVEH023L01
K21H00C KC2021 04 16.98545013 12 31.97 +09 48 14.5 19.9 GVEH023L01
K21H00C KC2021 04 16.98813113 12 32.83 +09 47 02.8 20.0 GVEH023L01
Observer details:
J95 Great Shefford. Observer P. Birtwhistle. 0.41-m f/6.3 Schmidt-Cassegrain
+ CCD.
K63 G. Pascoli Observatory, Castelvecchio Pascoli. Observer R. Bacci. 0.41-m
f/3.2 Newtonian reflector + CCD.
L01 Visnjan Observatory, Tican. Observers K. Korlevic, M. Himelreich. 1.0-m
f/2.9 reflector + 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.
Z99 Clixby Observatory, Cleethorpes. Observer A. Mickleburgh. 0.36-m f/8
Schmidt-Cassegrain + CCD.
Orbital elements:
2021 HC Earth MOID = 0.0344 AU
Epoch 2020 Dec. 17.0 TT = JDT 2459200.5 Veres
M 321.63956 (2000.0) P Q
n 0.41514222 Peri. 143.41374 -0.98752015 -0.12797556
a 1.7796644 Node 29.63220 +0.05880190 -0.84030122
e 0.4448715 Incl. 10.69943 +0.14610370 -0.52679799
P 2.37 H 26.01 G 0.15 U 8
Residuals in seconds of arc
210416 U68 0.2+ 1.2- 210416 J95 0.3- 0.5- 210416 Z99 0.5- 0.2-
210416 U68 0.1- 0.4+ 210416 J95 0.1+ 0.1+ 210416 Z99 0.3- 0.4+
210416 U68 0.4+ 0.4- 210416 K63 0.4+ 0.9+ 210416 L01 0.1+ 0.0
210416 U68 0.4- 1.3+ 210416 K63 0.7+ 0.3+ 210416 L01 0.3+ 0.0
210416 J95 0.1- 0.2- 210416 K63 0.3- 0.0 210416 L01 0.1+ 0.3-
210416 J95 0.2+ 0.2- 210416 Z99 0.0 0.1+ 210416 L01 0.1+ 0.1-
Ephemeris:
2021 HC a,e,i = 1.78, 0.44, 11 q = 0.9879
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2021 03 18 04 02 16.3 +71 58 41 0.1485 0.9881 83.0 88.5 25.0
...
2021 04 02 07 44 56.9 +78 03 10 0.07822 1.0003 88.4 87.2 23.5
...
2021 04 10 11 55 27.5 +60 05 39 0.04574 1.0186 110.3 67.3 21.7
...
2021 04 16 13 05 48.8 +17 25 46 0.03808 1.0372 151.5 27.5 20.2
2021 04 17 13 12 40.1 +09 44 17 0.03941 1.0406 158.8 20.4 20.1
2021 04 18 13 18 42.8 +02 39 00 0.04144 1.0442 165.3 14.2 20.0
...
2021 04 24 13 43 41.1 -24 52 13 0.06352 1.0676 166.8 12.4 20.9
...
2021 05 02 14 01 29.2 -38 34 12 0.1045 1.1037 155.5 22.3 22.4
...
2021 05 17 14 19 32.0 -45 18 29 0.1940 1.1828 149.6 25.6 24.0
M. P. C. Staff (C) Copyright 2021 MPC M.P.E.C. 2021-H23
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