MPEC 1998-Y09: 1997 SZ10
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M.P.E.C. 1998-Y09 Issued 1998 Dec. 18, 02:55 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
1997 SZ10
Revision to MPEC 1997-S16
Observations:
J97S10Z C1998 10 16.33632 00 52 14.07 +06 52 52.4 568
J97S10Z C1998 10 16.39944 00 52 13.67 +06 52 50.6 568
J97S10Z C1998 10 16.42354 00 52 13.52 +06 52 50.1 568
J97S10Z C1998 10 16.45345 00 52 13.38 +06 52 48.7 568
J97S10Z C1998 10 16.51749 00 52 12.96 +06 52 46.7 22.9 R 568
J97S10Z C1998 12 12.84052 00 48 18.21 +06 31 45.7 950
J97S10Z C1998 12 14.82509 00 48 15.69 +06 31 35.0 950
Observer details:
568 Mauna Kea. Observers C. Veillet. S. Banh. Canada-France-Hawaii
3.6-m reflector + CCD.
950 La Palma. Observers A. Fitzsimmons, E. Fletcher. 2.5-m Isaac Newton
Telescope.
First and last observations above in comparison with prediction:
Residuals in seconds of arc (or two decimals in degrees) and reference
981016 568 0.18+ 0.07+ 981214 950 0.19+ 0.07+ MPC 31280
Orbital elements:
1997 SZ10
Epoch 1999 Jan. 22.0 TT = JDT 2451200.5 Marsden
M 10.86196 (2000.0) P Q
n 0.00290112 Peri. 340.98772 +0.98490038 +0.16987363
a 48.6884476 Node 9.42083 -0.12025074 +0.80998230
e 0.3745556 Incl. 11.76664 -0.12454318 +0.56131241
P 340 H 8.4 G 0.15 U 5
Residuals in seconds of arc
970907 675 0.2- 0.2+ 971027 675 0.2- 0.4+ 981016 568 0.4+ 0.3-
970907 675 0.2- 0.3+ 971027 675 0.4- 0.3+ 981016 568 0.2- 0.3-
970924 568 0.2- 0.2+ 971027 675 0.1- 0.5+ 981212 950 0.4- 0.3+
970924 568 1.1+ 0.4+ 981016 568 0.3+ 0.3- 981214 950 0.1+ 0.3+
970927 696 0.1+ 1.3- 981016 568 0.1- 0.1-
970927 696 0.1- 0.9- 981016 568 0.2- 0.2+
Ephemeris:
1997 SZ10 a,e,i = 48.69, 0.37, 12 q = 30.452
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
1998 12 13 00 48.30 +06 31.7 30.856 31.252 112.9 1.7 23.5
1998 12 23 00 48.17 +06 31.4 31.026 31.256 102.7 1.8 23.6
1999 01 02 00 48.24 +06 32.2 31.202 31.260 92.5 1.8 23.6
1999 01 12 00 48.52 +06 34.4 31.379 31.264 82.4 1.8 23.6
1999 01 22 00 49.00 +06 37.8 31.553 31.269 72.3 1.7 23.6
1999 02 01 00 49.67 +06 42.5 31.718 31.273 62.4 1.6 23.6
This TNO appears to be the first proven case of an object in 1:2
mean-motion resonance with Neptune. The above orbit yields minimum distances
of 14.9 AU from Neptune and 10.5 AU from Uranus over an interval of some
14 000 years centered on the present. Further observations are necessary
to permit the libration to be examined in more detail.
Brian G. Marsden (C) Copyright 1998 MPC M.P.E.C. 1998-Y09
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