MPEC 1999-A06 : 1998 YO4 = 1993 HZ1
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M.P.E.C. 1999-A06 Issued 1999 Jan. 4, 17:47 UT
The Minor Planet Electronic Circulars contain information on unusual
minor planets and routine data on comets. They are published
on behalf of Commission 20 of the International Astronomical Union by the
Minor Planet Center, Smithsonian Astrophysical Observatory,
Cambridge, MA 02138, U.S.A.
BMARSDEN@CFA.HARVARD.EDU or GWILLIAMS@CFA.HARVARD.EDU
URL http://cfa-www.harvard.edu/iau/mpc.html
1998 YO4 = 1993 HZ1
Revision to MPEC 1998-Y23
Observations:
J98Y04O C1999 01 03.23594 03 22 51.02 +30 52 24.3 658
J98Y04O C1999 01 03.24187 03 22 50.82 +30 52 23.6 658
J98Y04O C1999 01 03.24705 03 22 50.65 +30 52 22.4 658
Observer details:
658 Dominion Astrophysical Observatory. Observer D. D. Balam. 1.82-m
reflector + CCD.
Orbital elements:
1998 YO4 = 1993 HZ1
Epoch 1999 Jan. 22.0 TT = JDT 2451200.5 Williams
M 235.36992 (2000.0) P Q
n 0.46354311 Peri. 199.30009 -0.67178854 +0.73665270
a 1.6535194 Node 28.65660 -0.65652685 -0.54352514
e 0.2482659 Incl. 9.32881 -0.34303447 -0.40239684
P 2.13 H 16.2 G 0.15 U 5
Residuals in seconds of arc
930425 675 0.4+ 1.1- 981218 468 0.7- 0.3+ 981221 704 1.0+ 0.1-
930426 675 0.5- 0.7+ 981218 046 0.0 0.4- 981221 704 0.1- 0.2-
930426 675 0.1+ 0.4+ 981218 046 0.8+ 0.3+ 981221 704 0.5+ 0.4+
981217 704 1.0- 0.6- 981218 046 1.0- 0.1- 981221 046 0.2- 0.4-
981217 704 (2.4+ 4.8-) 981218 046 0.5+ 0.1- 981221 046 0.8- 0.1-
981217 704 0.8+ 0.4- 981218 046 0.5- 0.7- 981221 046 0.0 0.0
981217 704 0.7+ 0.2- 981219 704 2.5+ 1.3- 981223 402 0.0 0.8-
981217 704 0.4- 0.1+ 981219 704 1.8+ 0.4- 981223 402 0.9+ 0.7+
981218 468 0.7- 0.7+ 981219 704 0.6- 0.7+ 981223 402 0.5+ 0.2+
981218 557 0.7- 0.1+ 981219 704 0.1+ 0.8+ 990103 658 0.7- 0.3-
981218 557 0.1+ 0.2- 981219 658 0.6- 0.6+ 990103 658 0.4- 0.3+
981218 468 0.6- 0.7+ 981219 658 0.8- 0.2+ 990103 658 0.2- 0.2+
981218 557 0.1- 0.3- 981219 658 0.3- 0.3+
Ephemeris:
1998 YO4 a,e,i = 1.65, 0.25, 9 q = 1.2430
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
1999 01 02 03 23.60 +30 56.9 1.165 1.979 134.0 20.9 19.0
1999 01 07 03 21.08 +30 39.6 1.201 1.971 128.6 23.0 19.2
1999 01 12 03 19.84 +30 24.7 1.241 1.962 123.4 24.8 19.3
1999 01 17 03 19.82 +30 12.5 1.282 1.952 118.4 26.3 19.4
1999 01 22 03 20.97 +30 03.5 1.326 1.942 113.6 27.7 19.5
1999 01 27 03 23.20 +29 57.6 1.371 1.932 109.1 28.8 19.6
1999 02 01 03 26.43 +29 54.8 1.417 1.922 104.8 29.7 19.7
1999 02 06 03 30.57 +29 54.8 1.463 1.911 100.7 30.5 19.7
1999 02 11 03 35.57 +29 57.4 1.510 1.899 96.8 31.1 19.8
1999 02 16 03 41.34 +30 02.0 1.556 1.887 93.1 31.5 19.9
1999 02 21 03 47.85 +30 08.4 1.602 1.875 89.5 31.8 19.9
1999 02 26 03 55.03 +30 16.2 1.647 1.863 86.1 32.0 20.0
1999 03 03 04 02.83 +30 24.9 1.691 1.850 82.8 32.1 20.0
1999 03 08 04 11.20 +30 34.0 1.734 1.837 79.7 32.1 20.1
1999 03 13 04 20.11 +30 43.1 1.776 1.823 76.6 32.0 20.1
1999 03 18 04 29.53 +30 51.9 1.816 1.809 73.7 31.9 20.1
1999 03 23 04 39.42 +30 59.9 1.854 1.795 70.9 31.6 20.2
1999 03 28 04 49.76 +31 06.8 1.891 1.781 68.2 31.4 20.2
1999 04 02 05 00.51 +31 12.0 1.925 1.766 65.6 31.0 20.2
1999 04 12 05 23.15 +31 16.2 1.989 1.735 60.7 30.2 20.2
1999 04 22 05 47.15 +31 09.8 2.046 1.704 56.1 29.3 20.2
1999 05 02 06 12.29 +30 50.3 2.094 1.671 51.9 28.3 20.2
1999 05 12 06 38.37 +30 15.3 2.134 1.638 47.9 27.2 20.1
1999 05 22 07 05.22 +29 23.1 2.167 1.604 44.2 26.1 20.1
1999 06 01 07 32.61 +28 12.2 2.193 1.570 40.7 24.9 20.0
1999 06 11 08 00.38 +26 41.5 2.211 1.536 37.5 23.7 20.0
1999 06 21 08 28.39 +24 50.6 2.224 1.502 34.5 22.6 19.9
1999 07 01 08 56.49 +22 39.5 2.231 1.468 31.8 21.4 19.8
Gareth V. Williams (C) Copyright 1999 MPC M.P.E.C. 1999-A06
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