MPEC 1995-W03 : 1995 WY2
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M.P.E.C. 1995-W03 Issued 1995 Nov. 22, 14:45 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
1995 WY2
Observations:
J95W02Y* C1995 11 18.5780 05 12 10.88 +22 58 40.6 23.4 R 568
J95W02Y C1995 11 18.5903 05 12 10.82 +22 58 40.6 568
J95W02Y C1995 11 18.6026 05 12 10.76 +22 58 40.6 568
J95W02Y C1995 11 19.4540 05 12 07.11 +22 58 38.0 568
J95W02Y C1995 11 19.4630 05 12 07.07 +22 58 38.3 568
J95W02Y C1995 11 19.4943 05 12 06.90 +22 58 37.6 568
Observer details:
568 Mauna Kea. Observers D. Jewitt, J. Luu. 10-m Keck Telescope.
Orbital elements:
1995 WY2
Assumed circular orbit
Epoch 1995 Nov. 19.0 TT = JDT 2450040.5 Marsden
(2000.0) P Q
n 0.00294338 Arg.lat. 359.96753 +0.19858911 -0.96451737
a 48.2212332 Node 78.57749 +0.89924843 +0.10872179
e 0.0000000 Incl. 10.22385 +0.38976228 +0.24059472
P 334.86 H 7.0 G 0.15
From 6 observations 1995 Nov. 18-19.
Ephemeris:
1995 WY2 a,e,i = 48.22, 0.00, 10
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
1995 11 19 05 12.15 +22 58.7 47.308 48.221 157.2 0.5 23.9
1995 11 29 05 11.40 +22 58.1 47.258 48.221 167.5 0.3 23.9
1995 12 09 05 10.62 +22 57.5 47.237 48.221 177.8 0.0 23.8
1995 12 19 05 09.83 +22 56.9 47.247 48.221 171.8 0.2 23.8
1995 12 29 05 09.07 +22 56.3 47.288 48.221 161.4 0.4 23.9
1996 01 08 05 08.36 +22 55.8 47.358 48.221 151.1 0.6 23.9
1996 01 18 05 07.72 +22 55.3 47.455 48.221 140.8 0.7 23.9
1996 01 28 05 07.20 +22 54.9 47.576 48.221 130.5 0.9 23.9
1996 02 07 05 06.79 +22 54.7 47.717 48.221 120.2 1.0 24.0
1996 02 17 05 06.52 +22 54.7 47.874 48.221 110.0 1.1 24.0
1996 02 27 05 06.40 +22 54.9 48.040 48.221 99.9 1.2 24.0
1996 03 08 05 06.44 +22 55.2 48.212 48.221 89.9 1.2 24.0
1996 03 18 05 06.62 +22 55.8 48.384 48.221 80.0 1.2 24.0
1996 03 28 05 06.96 +22 56.5 48.551 48.221 70.2 1.1 24.0
1996 04 07 05 07.44 +22 57.4 48.708 48.221 60.4 1.0 24.0
The closeness of the above circular-orbit solution to 1:2 Neptune
resonance should be considered fortuitous. It is more likely that
the object is near the aphelion of a moderately eccentric orbit, although
whether that orbit is a non-resonant 1992 QB1-type or a 2:3 Neptune
resonator (or an unstable Neptune-crosser) is completely unclear. An
aphelion orbit with a = 39.4 AU, e = 0.25 could be quite stable.
Supporting the editorial comments on MPEC 1995-W02, N. Thomas (Max-
Planck-Institut fur Aeronomie, Lindau), writing for the Kuiper Belt Object
Team of the European Space Agency's Infrared Space Observatory (ISO),
launched on Nov. 17, notes that attempting to separate the radii and
albedos of the Kuiper Belt objects is a major open-time programme of the
ISO mission. Since the field of the ISOPHOT instrument to be used for
this purpose is only 1.5 arcmin, accurate positional information is
required so that the objects can be centered in the field. Among the
targets for which observations are currently lacking are 1992 QB1 and
1993 SB. Three more targets, 1993 SC, 1994 JQ1 and 1994 TB, have in
fact been under observation this year. Two other potential targets,
1994 JV and 1994 VK8, appear to be lost.
Brian G. Marsden M.P.E.C. 1995-W03
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