MPEC 2003-U04 : 1937 UB (HERMES)
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M.P.E.C. 2003-U04 Issued 2003 Oct. 16, 19:42 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.
Supported in part by the Steven and Michele Kirsch Foundation
Prepared using the Tamkin Foundation Computer Network
MPC@CFA.HARVARD.EDU
URL http://cfa-www.harvard.edu/iau/mpc.html ISSN 1523-6714
1937 UB (HERMES)
Additional Observations:
J37U00B C2003 10 15.79236 01 44 14.27 +02 40 46.6 14.7 V 610
J37U00B C2003 10 15.79583 01 44 13.67 +02 40 44.6 610
J37U00B C2003 10 15.79931 01 44 13.07 +02 40 42.5 610
J37U00B C2003 10 15.80278 01 44 12.47 +02 40 40.4 610
J37U00B C2003 10 15.80625 01 44 11.87 +02 40 38.4 610
J37U00B C2003 10 15.83611 01 44 06.86 +02 40 22.2 14.6 V 610
J37U00B C2003 10 15.83958 01 44 06.25 +02 40 20.2 610
J37U00B C2003 10 15.84306 01 44 05.64 +02 40 18.2 610
J37U00B C2003 10 15.84653 01 44 05.04 +02 40 16.2 610
J37U00B C2003 10 15.85000 01 44 04.43 +02 40 14.2 610
J37U00B C2003 10 16.23884 01 42 58.41 +02 36 35.3 14.5 R 750
J37U00B C2003 10 16.24382 01 42 57.49 +02 36 32.3 14.5 R 750
J37U00B C2003 10 16.25028 01 42 56.32 +02 36 28.8 14.5 R 750
J37U00B C2003 10 16.26112 01 42 54.29 +02 36 22.3 14.5 R 750
J37U00B C2003 10 16.28702 01 42 50.35 +02 36 15.0 14.8 R 683
J37U00B C2003 10 16.29280 01 42 49.27 +02 36 11.6 14.8 R 683
J37U00B C2003 10 16.29874 01 42 48.14 +02 36 08.0 14.8 R 683
J37U00B C2003 10 16.50716 01 42 13.42 +02 34 04.6 15.0 V 379
J37U00B C2003 10 16.50858 01 42 13.17 +02 34 03.7 15.2 V 379
J37U00B C2003 10 16.50999 01 42 12.90 +02 34 03.0 15.2 V 379
J37U00B C2003 10 16.51140 01 42 12.62 +02 34 02.4 15.1 V 379
J37U00B C2003 10 16.51939 01 42 11.14 +02 33 57.5 15.3 V 379
J37U00B C2003 10 16.52088 01 42 10.85 +02 33 57.2 15.2 V 379
J37U00B C2003 10 16.52237 01 42 10.54 +02 33 55.6 15.2 V 379
J37U00B C2003 10 16.52387 01 42 10.28 +02 33 54.8 15.1 V 379
J37U00B C2003 10 16.52536 01 42 10.01 +02 33 54.1 15.2 V 379
J37U00B C2003 10 16.52818 01 42 09.45 +02 33 52.2 15.2 V 379
J37U00B C2003 10 16.53117 01 42 08.90 +02 33 50.9 15.2 V 379
J37U00B C2003 10 16.53197 01 42 08.84 +02 33 50.2 340
J37U00B C2003 10 16.53475 01 42 08.28 +02 33 48.4 340
J37U00B C2003 10 16.53764 01 42 07.75 +02 33 46.8 340
J37U00B C2003 10 16.54032 01 42 07.25 +02 33 45.0 14.7 R 340
J37U00B C2003 10 16.62097 01 41 51.59 +02 32 56.9 349
J37U00B C2003 10 16.62210 01 41 51.38 +02 32 56.3 349
J37U00B C2003 10 16.62334 01 41 51.13 +02 32 55.6 349
J37U00B C2003 10 16.62431 01 41 50.94 +02 32 55.0 14.7 V 349
Observer details:
340 Toyonaka. Observer Y. Ezaki. 0.30-m f/6 reflector + CCD.
349 Ageo. Observer K. Kadota. 0.25-m f/5.0 reflector + CCD.
379 Hamamatsu-Yuto. Observer S. Wakuda. 0.25-m f/5.0 Schmidt-Cassegrain
+ CCD.
610 Pianoro. Observer V. Goretti. 0.30-m f/5 Schmidt-Cassegrain + CCD.
683 Goodricke-Pigott Observatory, Tucson. Observer R. Tucker. 0.36-m
Schmidt-Cassegrain + CCD.
750 Hobbs Observatory, Fall Creek. Observer R. Elliott. 0.3-m f/10 reflector
+ CCD.
Orbital elements:
1937 UB PHA 0.003
Epoch 2003 Dec. 27.0 TT = JDT 2453000.5 Chesley and Chodas
M 1.79511 (2000.0) P Q
n 0.46297069 Peri. 92.39489 -0.59741263 -0.79969378
a 1.6548821 Node 34.51690 +0.68733912 -0.54909166
e 0.6241613 Incl. 6.06802 +0.41311388 -0.24287487
P 2.13 H 17.5 G 0.15 U 2
Residuals in seconds of arc (or two decimals in units of degrees)
371025 801 1.3+ 0.3+ 031015 699 0.1+ 0.2- 031015 587 0.1- 0.1-
371026 031(15.0- 19.7-) 031015 699 0.1- 0.2- 031015 106 0.1+ 0.3-
371026 031(23.2+ 20.1-) 031015 673 0.2- 0.3+ 031015 106 0.1+ 0.3-
371027 078 4.1- 0.3+ 031015 673 0.3- 0.3+ 031015 106 0.2+ 0.3-
371027 078 0.6+ 1.2- 031015 673 0.2- 0.1+ 031015 106 0.2+ 0.3-
371027 078 (6.4+ 2.8-) 031015 673 0.1+ 0.3+ 031015 106 0.2+ 0.2-
371027 078 1.8- 1.6+ 031015 673 0.3+ 0.4+ 031015 106 0.0+ 0.3-
371027 078 0.4+ 1.1+ 031015 108 (3.3+ 0.1-) 031015 J95 0.4+ 0.2-
371027 078 4.2+ 0.6- 031015 108 (1.5+ 3.6+) 031015 J95 0.2+ 0.3-
371027 031(13.8- 14.2-) 031015 198 0.2+ 0.1- 031015 J95 0.4+ 0.3-
371028 031(0.03+ 0.00-) 031015 198 0.4+ 0.1- 031016 750 0.1+ 0.4+
371028 024 (6.5+ 3.4+) 031015 610 0.5+ 0.4+ 031016 750 0.0- 0.3+
371028 031(43.8- 8.6-) 031015 198 0.0+ 0.1- 031016 750 0.2+ 0.5+
371028 024 0.2- 0.7- 031015 610 0.2+ 0.2+ 031016 750 0.3- 0.2+
371028 031(76.3+ 8.9-) 031015 151 0.1+ 0.4- 031016 683 0.3+ 0.1-
371029 031(35.1+ 50.1-) 031015 151 0.1- 0.1- 031016 683 0.3+ 0.1-
030826 704 0.7+ 1.1- 031015 610 0.1- 0.0+ 031016 683 0.0+ 0.3-
030826 704 0.0- 0.2+ 031015 151 0.1- 0.1+ 031016 379 0.1+ 0.1-
030826 704 0.6+ 0.1+ 031015 151 0.0+ 0.2- 031016 379 0.4+ 0.2-
030826 704 0.2- 1.9+ 031015 610 0.3- 0.2- 031016 379 0.3+ 0.1-
030903 704 0.6- 0.4+ 031015 198 0.3+ 0.2- 031016 379 0.0+ 0.1+
030903 704 0.8+ 0.1+ 031015 108 0.5- 1.4+ 031016 379 0.3+ 0.1-
030903 704 0.1+ 0.6- 031015 610 0.5- 0.3- 031016 379 0.2+ 0.5+
030903 704 0.1- 0.4- 031015 970 0.5+ 0.7+ 031016 379 0.2- 0.3-
030928 704 0.1+ 0.3+ 031015 970 0.5+ 0.5+ 031016 379 0.1+ 0.2-
030928 704 0.3+ 0.9- 031015 610 0.5+ 0.1- 031016 379 0.3+ 0.0-
030928 704 1.3- 0.5- 031015 610 0.3+ 0.2- 031016 379 0.1- 0.3-
030928 704 0.2- 0.1- 031015 970 0.2+ 0.6+ 031016 379 0.1+ 0.2+
030928 699 0.1- 0.0- 031015 610 0.1+ 0.3- 031016 340 0.3+ 0.0+
030928 699 0.3- 0.1+ 031015 970 0.2+ 0.5+ 031016 340 0.2- 0.2-
030928 699 0.2- 0.5- 031015 610 0.0+ 0.4- 031016 340 0.0+ 0.1-
030928 699 0.3+ 0.2+ 031015 587 1.1- 0.3- 031016 340 0.1+ 0.3-
031005 608 0.5- 0.5+ 031015 587 1.0- 0.2+ 031016 349 0.2- 0.1-
031005 608 0.3- 0.7+ 031015 587 0.7- 0.1- 031016 349 0.1- 0.1-
031005 608 0.3- 0.2+ 031015 587 0.2- 0.1- 031016 349 0.2- 0.0-
031015 699 0.0- 0.0- 031015 587 0.7- 0.3+ 031016 349 0.3- 0.0-
031015 699 0.2- 0.1- 031015 610 0.1- 0.5-
Ephemeris:
1937 UB a,e,i = 1.65, 0.62, 6 q = 0.6220
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2003 10 08 01 58.54 +03 35.4 0.287 1.277 163.4 12.9 16.1
2003 10 09 01 57.29 +03 30.0 0.275 1.267 164.6 12.1 15.9
2003 10 10 01 55.90 +03 24.3 0.264 1.256 165.7 11.3 15.8
2003 10 11 01 54.35 +03 18.1 0.253 1.246 166.9 10.5 15.7
2003 10 12 01 52.63 +03 11.4 0.242 1.236 168.0 9.7 15.5
2003 10 13 01 50.73 +03 04.3 0.231 1.226 169.1 8.8 15.4
2003 10 14 01 48.61 +02 56.6 0.221 1.216 170.2 8.0 15.2
2003 10 15 01 46.26 +02 48.3 0.210 1.205 171.2 7.3 15.0
2003 10 16 01 43.64 +02 39.3 0.200 1.195 172.0 6.7 14.9
2003 10 17 01 40.72 +02 29.6 0.189 1.185 172.5 6.3 14.7
2003 10 18 01 37.45 +02 18.9 0.179 1.174 172.7 6.2 14.6
2003 10 19 01 33.78 +02 07.2 0.169 1.164 172.4 6.5 14.5
2003 10 20 01 29.64 +01 54.2 0.159 1.153 171.6 7.2 14.3
2003 10 21 01 24.96 +01 39.8 0.149 1.143 170.4 8.4 14.2
2003 10 22 01 19.63 +01 23.7 0.139 1.132 168.7 9.9 14.1
2003 10 23 01 13.53 +01 05.6 0.130 1.122 166.7 11.7 14.0
2003 10 24 01 06.49 +00 45.0 0.120 1.111 164.4 13.9 13.9
2003 10 25 00 58.31 +00 21.4 0.111 1.101 161.7 16.5 13.8
2003 10 26 00 48.73 -00 05.8 0.102 1.090 158.5 19.5 13.7
2003 10 27 00 37.38 -00 37.7 0.094 1.079 154.9 23.0 13.6
2003 10 28 00 23.83 -01 15.1 0.085 1.069 150.7 27.1 13.5
2003 10 29 00 07.47 -01 59.5 0.077 1.058 145.7 31.9 13.4
2003 10 30 23 47.56 -02 52.2 0.070 1.048 139.9 37.7 13.3
2003 10 31 23 23.19 -03 54.3 0.063 1.037 132.9 44.5 13.3
2003 11 01 22 53.42 -05 05.9 0.057 1.026 124.6 52.8 13.3
2003 11 02 22 17.57 -06 24.6 0.052 1.015 114.8 62.5 13.4
2003 11 03 21 35.82 -07 43.6 0.049 1.005 103.5 73.7 13.6
2003 11 04 20 49.83 -08 52.4 0.048 0.994 91.3 85.9 13.9
2003 11 05 20 02.86 -09 40.6 0.048 0.983 78.9 98.3 14.4
2003 11 06 19 18.55 -10 04.2 0.051 0.973 67.2 110.0 15.1
2003 11 07 18 39.48 -10 06.9 0.055 0.962 56.8 120.4 16.0
The orbit above is based on a computation linking the 1937 and 2003
observations by S. R. Chesley and P. W. Chodas of NASA's NEO Program Office
at the Jet Propulsion Laboratory, Pasadena, California. They note that the
trajectory of 1937 UB is very chaotic due to frequent and close planetary
encounters. Between the 1937 October encounter at 0.00495 AU and the present
encounter, 1937 UB made eight intervening close approaches to the Earth or
Venus at distances less than 0.06 AU, including an approach to within
0.0043 AU of Earth on 1942 April 26.7. These perturbations dramatically
narrowed the region of convergence for differential corrections, so that very
precise initial conditions were required to permit a least-squares fit. With
the use of just the 2003 astrometry the JPL Sentry impact monitoring software
(which was specifically developed to cope with such extreme nonlinearity)
identified twelve dynamically distinct routes from 2003 to the 1937 encounter.
Comparing target plane projections of these possibilities with that of the
observed 1937 encounter enabled them to derive suitable initial conditions
permitting a general orbital solution using all data, with appropriate
weighting of the low-quality 1937 data.
Gareth V. Williams (C) Copyright 2003 MPC M.P.E.C. 2003-U04
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