MPEC 2021-H21 : 2021 HB
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M.P.E.C. 2021-H21 Issued 2021 April 17, 01:47 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 HB
Observations:
K21H00B* C2021 04 16.38481514 53 11.50 -07 04 48.3 18.65RUEH021I41
K21H00B C2021 04 16.38516214 53 12.31 -07 04 18.3 18.65RUEH021I41
K21H00B C2021 04 16.38762714 53 18.34 -07 00 27.9 18.46RUEH021I41
K21H00B C2021 04 16.38797514 53 19.19 -06 59 54.6 18.46RUEH021I41
K21H00B C2021 04 16.40263914 53 54.79 -06 37 07.3 18.61RUEH021I41
K21H00B C2021 04 16.40298614 53 55.62 -06 36 35.1 18.61RUEH021I41
K21H00B C2021 04 16.41050614 54 14.08 -06 24 55.3 UEH021I41
K21H00B C2021 04 16.41860214 54 33.95 -06 12 14.8 UEH021I41
K21H00B C2021 04 16.41895014 54 34.82 -06 11 40.9 UEH021I41
K21H00B KC2021 04 16.81889 15 13 14.81 +04 58 34.4 19.5 GVEH021N82
K21H00B KC2021 04 16.82138 15 13 21.80 +05 02 59.6 19.3 GVEH021N82
K21H00B KC2021 04 16.82387 15 13 28.81 +05 07 23.1 18.5 GVEH021N82
K21H00B KC2021 04 16.94028915 19 33.71 +08 35 25.3 18.6 GVEH021J95
K21H00B KC2021 04 16.94477115 19 46.97 +08 43 32.4 19.1 GVEH021J95
K21H00B KC2021 04 16.94742915 19 53.20 +08 49 16.5 19.3 GVEH021K63
K21H00B KC2021 04 16.94905815 19 57.99 +08 52 14.0 18.6 GVEH021K63
K21H00B KC2021 04 16.95079915 20 04.84 +08 54 26.0 18.7 GVEH021J95
K21H00B KC2021 04 16.95294015 20 09.42 +08 59 15.6 18.9 GVEH021K63
K21H00B KC2021 04 16.96871815 20 58.04 +09 26 53.2 19.1 GVEH021J95
K21H00B KC2021 04 16.97423615 21 14.12 +09 36 53.5 18.7 GVEH021Z80
K21H00B KC2021 04 16.97638415 21 20.83 +09 40 47.5 19.2 GVEH021J95
K21H00B KC2021 04 16.98827515 21 56.23 +10 02 21.5 19.0 GVEH021J95
K21H00B KC2021 04 16.98924715 21 58.68 +10 04 07.0 18.9 GVEH021Z80
K21H00B KC2021 04 16.99200515 22 06.41 +10 08 55.1 19.1 GVEH021Z99
K21H00B KC2021 04 16.99297015 22 11.83 +10 11 48.8 18.3 GXEH021958
K21H00B KC2021 04 16.99302515 22 09.44 +10 10 46.6 19.5 GVEH021Z99
K21H00B KC2021 04 16.99404715 22 12.52 +10 12 38.0 19.0 GVEH021Z99
K21H00B KC2021 04 16.99525715 22 12.43 +10 15 46.4 19.3 GVEH021595
K21H00B KC2021 04 16.99812015 22 27.08 +10 21 10.9 XEH021958
K21H00B KC2021 04 16.99888615 22 23.10 +10 22 22.0 19.2 GVEH021595
K21H00B KC2021 04 17.00331015 22 42.43 +10 30 36.8 XEH021958
K21H00B KC2021 04 17.00922915 22 53.69 +10 41 13.4 19.4 GVEH021L01
K21H00B KC2021 04 17.01008715 22 56.25 +10 42 46.9 19.0 GVEH021L01
K21H00B KC2021 04 17.01087215 22 58.57 +10 44 12.5 18.9 GVEH021L01
K21H00B KC2021 04 17.01180215 23 01.33 +10 45 54.5 19.3 GVEH021L01
K21H00B KC2021 04 17.01590215 23 13.55 +10 53 16.3 VEH021595
K21H00B KC2021 04 17.02359215 23 36.40 +11 07 14.9 18.8 GVEH021595
Observer details:
595 Farra d'Isonzo. Observer E. Pettarin. 0.61-m f/4.5 reflector + CCD.
958 Observatoire de Dax. Observer P. Dupouy. 0.32-m Schmidt-Cassegrain +
CCD.
I41 Palomar Mountain--ZTF. Observers B. T. Bolin, V. Bhalerao, Y.-L. Cheng,
C. M. Copperwheat, K. P. Deshmukh, C.-Y. Hsu, Z.-Y. Lin, J. Purdum, S.
Royle, K. Sharma, C. Zhai, Z. T. F. Collaboration. Measurers B. T. Bolin,
D. A. Duev, H.-W. Lin, F. J. Masci. 1.2-m f/2.4 Schmidt.
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.
N82 Multa Observatory. Observer L. Elenin. 0.4-m f/1.25 reflector + CCD.
Z80 Northolt Branch Observatory. Observer G. Wells. 0.25-m f/8.0 Ritchey-
Chretien + CCD.
Z99 Clixby Observatory, Cleethorpes. Observer A. Mickleburgh. 0.36-m f/8
Schmidt-Cassegrain + CCD.
Orbital elements:
2021 HB Earth MOID = 0.0156 AU
Epoch 2020 Dec. 17.0 TT = JDT 2459200.5 Veres
M 257.71237 (2000.0) P Q
n 0.60659941 Peri. 60.58598 -0.09573893 +0.97529709
a 1.3820849 Node 206.28607 -0.99539508 -0.09476075
e 0.3593693 Incl. 26.71297 -0.00476337 +0.19953946
P 1.62 H 26.70 G 0.15 U 8
Residuals in seconds of arc
210416 I41 0.1+ 0.0 210416 J95 0.0 0.1+ 210416 Z99 0.0 0.1+
210416 I41 (0.5- 2.2-) 210416 K63 0.2- 0.5- 210416 595 0.4+ 0.2-
210416 I41 0.0 0.6- 210416 K63 0.1+ 0.3+ 210416 958 (0.3+ 2.1+)
210416 I41 0.2+ 0.5+ 210416 J95 0.0 0.5- 210416 595 0.4- 0.1+
210416 I41 (2.1- 1.4+) 210416 K63 0.7+ 0.3+ 210417 958 (0.4- 2.0+)
210416 I41 (2.3- 1.1+) 210416 J95 0.1- 0.3- 210417 L01 0.0 0.1-
210416 I41 (1.6- 3.3-) 210416 Z80 0.1+ 0.3- 210417 L01 0.3+ 0.1-
210416 I41 (1.8- 3.5-) 210416 J95 0.2- 0.1+ 210417 L01 0.2+ 0.1-
210416 I41 (1.5- 2.2-) 210416 J95 0.2- 0.4- 210417 L01 0.2+ 0.5+
210416 N82 0.6- 0.3+ 210416 Z80 1.5- 0.7- 210417 595 0.2+ 0.0
210416 N82 0.5- 1.8+ 210416 Z99 0.2- 0.4- 210417 595 0.3+ 0.1+
210416 N82 0.6- 0.3+ 210416 958 0.5+ 1.4+
210416 J95 0.5+ 0.8- 210416 Z99 0.4- 0.0
Ephemeris:
2021 HB a,e,i = 1.38, 0.36, 27 q = 0.8854
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2021 03 18 11 58 19.0 -57 41 18 0.3002 1.1791 121.2 46.2 26.2
...
2021 04 02 12 13 51.9 -57 58 23 0.1508 1.0959 126.5 47.2 24.6
...
2021 04 10 12 47 55.0 -53 32 03 0.07247 1.0535 134.0 43.2 22.8
...
2021 04 16 14 37 30.2 -16 04 10 0.02043 1.0232 163.9 15.8 19.2
2021 04 17 15 22 19.0 +10 27 54 0.01719 1.0183 147.1 32.4 19.3
2021 04 18 16 20 57.3 +38 19 23 0.01918 1.0134 118.7 60.3 20.3
...
2021 04 24 21 18 37.0 +67 31 53 0.06962 0.9856 71.3 104.8 24.8
...
2021 05 02 22 38 11.6 +65 42 58 0.1462 0.9523 63.8 108.3 26.5
...
2021 05 17 23 25 02.2 +63 18 00 0.2869 0.9056 60.6 103.4 27.6
M. P. C. Staff (C) Copyright 2021 MPC M.P.E.C. 2021-H21
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