MPEC 2007-S05 : 2004 ET21
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M.P.E.C. 2007-S05 Issued 2007 Sept. 17, 17:42 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.
Prepared using the Tamkin Foundation Computer Network
MPC@CFA.HARVARD.EDU
URL http://www.cfa.harvard.edu/iau/mpc.html ISSN 1523-6714
2004 ET21
Revision to MPEC 2004-F21
Additional Observations:
K04E21T C2007 09 16.23365 23 18 47.03 -07 06 32.9 19.0 ES005704
K04E21T C2007 09 16.24547 23 18 46.45 -07 08 12.1 19.3 ES005704
K04E21T C2007 09 16.25725 23 18 45.85 -07 09 50.8 19.3 ES005704
K04E21T C2007 09 16.26903 23 18 45.43 -07 11 29.5 19.5 ES005704
K04E21T C2007 09 16.28085 23 18 44.92 -07 13 08.9 19.8 ES005704
K04E21T C2007 09 17.12332 23 18 15.64 -09 11 47.3 18.5 V ES005H85
K04E21T C2007 09 17.13832 23 18 15.01 -09 13 55.5 18.3 V ES005H85
K04E21T C2007 09 17.15334 23 18 14.32 -09 16 04.0 18.8 V ES005H85
K04E21T C2007 09 17.41059 23 18 05.59 -09 51 55.6 19.3 R ES005474
K04E21T C2007 09 17.41152 23 18 05.53 -09 52 03.2 18.7 R ES005474
K04E21T C2007 09 17.41221 23 18 05.52 -09 52 09.1 18.6 R ES005474
Observer details:
474 Mount John Observatory, Lake Tekapo. Observer A. C. Gilmore. 1.0-m f/7.7
reflector + CCD.
704 Lincoln Laboratory ETS, New Mexico. Observers M. Bezpalko, D. Torres,
R. Kracke, G. Spitz, J. Kistler. Measurers J. Stuart, S. Scruggs. 1.0-m
f/2.15 reflector + CCD.
H85 Silver Spring. Observer K. Levin. Measurer J. C. Pelle. 0.45-m f/7.25
Ritchey-Chretien + 3072x2054 CCD.
First and last observations above in comparison with prediction:
Residuals in seconds of arc (or two decimals in degrees), reference and Delta-T
070916 70459.20+21.64- 070917 47458.53+23.43- MPO 62522 -53.3 day
Orbital elements:
2004 ET21 Earth MOID = 0.2750 AU
Epoch 2007 Oct. 27.0 TT = JDT 2454400.5 MPC
M 342.76267 (2000.0) P Q
n 0.47250991 Peri. 248.14096 +0.47523395 -0.87383287
a 1.6325335 Node 171.09553 +0.82122914 +0.48246637
e 0.3237056 Incl. 41.61847 -0.31580912 -0.06035167
P 2.09 H 20.7 G 0.15 U 4
Residuals in seconds of arc
040315 691 0.4- 0.2+ 040316 246 1.0- 1.1+ 070916 704 0.6+ 0.2+
040315 691 0.3- 0.6- 040317 291 0.0 0.4- 070916 704 1.0+ 0.0
040315 691 0.1- 0.1+ 040317 291 0.4+ 0.0 070917 H85 0.6- 0.1+
040316 291 0.1- 0.1+ 040317 291 0.3+ 0.3+ 070917 H85 0.0 0.4-
040316 291 0.0 0.1- 040324 696 0.5- 0.5- 070917 H85 0.2- 1.0-
040316 291 0.2- 0.1- 040324 696 0.2+ 0.1+ 070917 474 0.2+ 0.0
040316 246 1.2+ 0.5+ 070916 704 0.4+ 0.2+ 070917 474 0.1- 0.4+
040316 246 1.5+ 1.3+ 070916 704 0.2- 0.1+ 070917 474 0.2+ 0.4+
040316 246 0.1- 0.5- 070916 704 1.2- 0.2+
Ephemeris:
2004 ET21 a,e,i = 1.63, 0.32, 42 q = 1.1041
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2007 09 17 23 18.32 -08 53.9 0.293 1.296 172.2 6.1 19.1
2007 09 27 23 12.49 -32 24.4 0.299 1.255 143.4 28.5 19.8
2007 10 07 23 08.72 -50 23.1 0.353 1.217 120.3 45.1 20.6
2007 10 17 23 10.19 -61 22.3 0.431 1.183 104.8 54.5 21.2
2007 10 27 23 19.71 -67 48.4 0.514 1.154 94.4 59.2 21.7
2007 11 06 23 38.58 -71 37.0 0.593 1.131 87.3 61.1 22.0
Timothy B. Spahr (C) Copyright 2007 MPC M.P.E.C. 2007-S05
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