MPEC 1998-O21 : 1998 OP4
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M.P.E.C. 1998-O21 Issued 1998 July 28, 22:06 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 OP4
Observations:
J98O04P* C1998 07 27.25259 20 17 13.32 -01 14 47.3 18.0 V 691
J98O04P C1998 07 27.25661 20 17 19.01 -01 16 13.8 18.1 V 691
J98O04P C1998 07 27.26095 20 17 25.18 -01 17 47.8 17.6 V 691
J98O04P C1998 07 27.31251 20 18 38.11 -01 36 21.0 17.3 V 691
J98O04P C1998 07 27.31954 20 18 48.06 -01 38 52.5 17.5 V 691
J98O04P C1998 07 27.32549 20 18 56.52 -01 41 01.5 17.7 V 691
J98O04P C1998 07 27.34360 20 19 22.07 -01 47 31.4 696
J98O04P C1998 07 27.34488 20 19 23.89 -01 47 59.3 696
J98O04P C1998 07 27.34704 20 19 26.95 -01 48 45.9 17.1 R 696
J98O04P C1998 07 27.41834 20 21 08.55 -02 14 24.4 17.5 V 691
J98O04P C1998 07 27.42269 20 21 14.75 -02 15 58.1 17.5 V 691
J98O04P C1998 07 27.90318 20 33 25.45 -05 08 37.0 598
J98O04P C1998 07 27.91078 20 33 36.35 -05 11 17.1 598
J98O04P C1998 07 27.91859 20 33 47.46 -05 14 06.5 598
J98O04P FC1998 07 28.23869 20 41 46.40 -07 06 32.3 696
J98O04P FC1998 07 28.24184 20 41 50.85 -07 07 38.2 696
J98O04P C1998 07 28.25831 20 42 14.21 -07 13 26.4 18.1 V 691
J98O04P C1998 07 28.26230 20 42 19.83 -07 14 50.0 18.0 V 691
J98O04P C1998 07 28.36663 20 44 47.92 -07 51 24.1 17.4 R 673
Observer details:
598 Loiano. Observers A. Boattini, E. Gregori, S. Amici, M. Tombelli.
1.5-m reflector + CCD.
673 Table Mountain Observatory, Wrightwood. Observers M. D. Hicks,
G. Genevier. 0.6-m reflector + CCD.
691 Steward Observatory, Kitt Peak. Observer J. V. Scotti. 0.9-m Spacewatch
telescope.
696 Whipple Observatory, Mt. Hopkins. Observer C. W. Hergenrother. 1.2-m
reflector + CCD.
Orbital elements:
1998 OP4
Epoch 1998 July 6.0 TT = JDT 2451000.5 Williams
M 356.35460 (2000.0) P Q
n 0.28987192 Peri. 167.27654 +0.41470907 +0.89106740
a 2.2611634 Node 126.92574 -0.85377599 +0.45114276
e 0.5367165 Incl. 13.33882 -0.31477444 -0.04968994
P 3.40 H 24.0 G 0.15 U 7
From 18 observations 1998 July 27-28, mean residual 0".53.
Ephemeris:
1998 OP4 a,e,i = 2.26, 0.54, 13 q = 1.0476
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
1998 07 26.0 19 46.30 +06 10.5 0.040 1.052 153.0 26.1 18.3
1998 07 26.5 19 58.50 +03 16.4 0.040 1.052 156.6 22.6 18.2
1998 07 27.0 20 10.85 +00 18.2 0.039 1.053 160.1 19.2 18.1
1998 07 27.5 20 23.29 -02 41.4 0.039 1.053 163.5 15.9 17.9
1998 07 28.0 20 35.73 -05 39.9 0.039 1.054 166.5 13.0 17.9
1998 07 28.5 20 48.10 -08 34.8 0.040 1.055 168.8 10.8 17.8
1998 07 29.0 21 00.32 -11 23.7 0.041 1.055 170.0 9.7 17.8
1998 07 29.5 21 12.33 -14 04.8 0.041 1.056 169.8 9.8 17.8
1998 07 30.0 21 24.05 -16 36.5 0.042 1.057 168.4 11.1 18.0
1998 07 30.5 21 35.44 -18 58.0 0.044 1.058 166.5 13.0 18.1
1998 07 31.0 21 46.45 -21 08.8 0.045 1.059 164.2 15.2 18.2
1998 07 31.5 21 57.05 -23 08.8 0.047 1.060 161.8 17.4 18.4
1998 08 01.0 22 07.21 -24 58.2 0.048 1.060 159.5 19.6 18.5
1998 08 01.5 22 16.91 -26 37.6 0.050 1.061 157.3 21.6 18.7
1998 08 02.0 22 26.16 -28 07.4 0.052 1.062 155.2 23.6 18.8
1998 08 02.5 22 34.94 -29 28.5 0.054 1.063 153.3 25.4 19.0
1998 08 03.0 22 43.27 -30 41.5 0.056 1.065 151.5 27.0 19.1
1998 08 03.5 22 51.15 -31 47.3 0.058 1.066 149.9 28.6 19.2
1998 08 04.0 22 58.59 -32 46.4 0.061 1.067 148.4 29.9 19.4
1998 08 04.5 23 05.63 -33 39.6 0.063 1.068 147.0 31.2 19.5
1998 08 05.0 23 12.26 -34 27.5 0.065 1.069 145.7 32.4 19.6
1998 08 06.0 23 24.40 -35 49.6 0.070 1.072 143.4 34.3 19.8
1998 08 07.0 23 35.18 -36 56.5 0.075 1.074 141.5 36.0 20.0
1998 08 08.0 23 44.74 -37 51.4 0.081 1.077 140.0 37.3 20.2
1998 08 09.0 23 53.23 -38 36.7 0.086 1.080 138.6 38.3 20.4
1998 08 10.0 00 00.76 -39 14.3 0.091 1.083 137.5 39.2 20.5
1998 08 11.0 00 07.46 -39 45.7 0.097 1.086 136.6 39.9 20.7
1998 08 12.0 00 13.42 -40 12.0 0.102 1.089 135.9 40.4 20.8
1998 08 13.0 00 18.72 -40 34.3 0.108 1.093 135.3 40.8 21.0
1998 08 14.0 00 23.45 -40 53.1 0.114 1.096 134.7 41.0 21.1
1998 08 15.0 00 27.65 -41 09.0 0.119 1.100 134.4 41.2 21.2
1998 08 16.0 00 31.40 -41 22.5 0.125 1.103 134.0 41.3 21.3
1998 08 17.0 00 34.73 -41 34.0 0.131 1.107 133.8 41.3 21.4
1998 08 18.0 00 37.69 -41 43.7 0.137 1.111 133.6 41.2 21.5
1998 08 19.0 00 40.33 -41 51.8 0.143 1.115 133.5 41.1 21.6
1998 08 20.0 00 42.66 -41 58.6 0.149 1.119 133.5 41.0 21.7
1998 08 21.0 00 44.72 -42 04.2 0.155 1.124 133.5 40.8 21.8
1998 08 22.0 00 46.53 -42 08.6 0.160 1.128 133.5 40.6 21.9
1998 08 23.0 00 48.12 -42 12.1 0.166 1.132 133.5 40.3 22.0
1998 08 24.0 00 49.50 -42 14.7 0.172 1.137 133.6 40.1 22.0
1998 08 25.0 00 50.70 -42 16.4 0.178 1.142 133.8 39.8 22.1
Gareth V. Williams (C) Copyright 1998 MPC M.P.E.C. 1998-O21
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