MPEC 2010-H68 : COMET C/2009 UG89 (LEMMON)
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M.P.E.C. 2010-H68 Issued 2010 Apr. 28, 01:29 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 https://www.minorplanetcenter.org/iau/mpc.html ISSN 1523-6714
COMET C/2009 UG89 (LEMMON)
Additional observations:
CK09U89G C2010 04 21.43376 21 09 53.85 -00 15 06.5 EH068H06
CK09U89G C2010 04 21.44105 21 09 53.74 -00 15 02.5 EH068H06
CK09U89G C2010 04 21.44834 21 09 53.69 -00 14 58.4 18.5 T EH068H06
CK09U89G C2010 04 22.42634 21 09 42.06 -00 06 13.5 EH068H06
CK09U89G C2010 04 22.43218 21 09 42.08 -00 06 10.3 18.8 T EH068H06
CK09U89G C2010 04 23.42161 21 09 29.22 +00 02 43.3 EH068H06
CK09U89G C2010 04 23.42708 21 09 29.16 +00 02 46.4 EH068H06
CK09U89G C2010 04 23.43255 21 09 29.10 +00 02 49.0 18.4 T EH068H06
CK09U89G C2010 04 25.46991 21 09 00.00 +00 21 17.3 EH068291
CK09U89G C2010 04 25.47690 21 08 59.88 +00 21 20.5 18.7 T EH068291
CK09U89G C2010 04 25.48390 21 08 59.77 +00 21 25.3 18.8 T EH068291
CK09U89G C2010 04 25.44169 21 09 00.47 +00 21 01.1 EH068H06
CK09U89G C2010 04 25.44354 21 09 00.45 +00 21 02.1 17.8 T EH068H06
CK09U89G C2010 04 27.46745 21 08 27.59 +00 39 30.7 EH068926
CK09U89G C2010 04 27.47759 21 08 27.45 +00 39 37.0 18.9 T EH068926
Observer details:
291 LPL/Spacewatch II. Observer R. S. McMillan. 1.8-m f/2.7 reflector + CCD.
926 Tenagra II Observatory. Observers P. R. Holvorcem, M. Schwartz. Measurer
P. R. Holvorcem. 0.81-m f/7 Ritchey-Chretien + CCD.
H06 RAS Observatory, Mayhill. Observer H. Sato. 0.25-m f/3.4 reflector + CCD.
Orbital elements:
C/2009 UG89 (Lemmon)
Epoch 2010 Dec. 30.0 TT = JDT 2455560.5
T 2010 Dec. 16.26592 TT MPC
q 3.9313590 (2000.0) P Q
z -0.0020510 Peri. 60.65043 +0.02768606 -0.87612283
+/-0.0000137 Node 321.00843 -0.94853295 +0.12892214
e 1.0080631 Incl. 130.10013 +0.31546590 +0.46452972
From 64 observations 2009 Oct. 22-2010 Apr. 27, mean residual 0".40.
Residuals in seconds of arc
091022 G96 0.3+ 0.2- 091024 291 0.0 0.0 091109 291 0.2- 0.3-
091022 G96 0.2- 0.0 091024 H01 0.2- 0.0 091109 291 0.1- 0.1+
091022 G96 0.2- 0.1- 091024 H01 0.0 0.0 091109 291 0.4+ 0.3-
091022 G96 0.3+ 0.3- 091024 H01 0.4- 0.2+ 091109 291 0.2+ 0.0
091022 G96 0.4- 0.4- 091025 H01 0.3- 0.2- 091109 291 0.2- 0.1-
091022 G96 0.0 0.3- 091025 H01 0.2- 0.1- 100421 H06 0.1- 0.0
091022 G96 0.3- 0.1+ 091025 H01 0.2- 0.1- 100421 H06 0.4- 0.1+
091022 G96 0.3+ 0.1- 091025 G96 0.6+ 0.2- 100421 H06 0.1+ 0.3+
091024 H36 0.3- 0.1- 091025 G96 0.4- 0.1+ 100422 H06 0.7+ 0.7-
091024 G96 0.1- 0.0 091025 G96 0.1- 0.1- 100422 H06 2.1+ 0.6-
091024 G96 0.6+ 0.0 091025 G96 0.7- 0.4+ 100423 H06 0.3- 1.2-
091024 H36 0.6+ 0.2- 091025 H01 0.3- 0.3- 100423 H06 0.0 1.0-
091024 G96 0.1- 0.1+ 091025 291 0.1+ 0.1- 100423 H06 0.2+ 1.4-
091024 G96 0.1+ 0.1+ 091025 291 0.1- 0.0 100425 291 0.1- 0.4+
091024 H36 1.0+ 0.3- 091025 291 0.0 0.1+ 100425 291 0.3- 0.2-
091024 G96 0.2+ 0.0 091108 291 0.3+ 0.5+ 100425 291 0.3- 0.8+
091024 291 0.1- 0.2- 091108 291 0.4- 0.2- 100425 H06 0.4+ 0.4-
091024 G96 0.0 0.3- 091108 291 0.2+ 0.6+ 100425 H06 0.6+ 0.4-
091024 G96 0.3+ 0.2+ 091109 291 0.1+ 0.0 100427 926 0.6- 0.4+
091024 G96 0.1+ 0.1+ 091109 291 0.0 0.1+ 100427 926 0.1- 1.1+
091024 291 0.1+ 0.2+ 091109 291 0.1- 0.0
091024 H01 0.2- 0.2- 091109 291 0.1- 0.1+
Ephemeris:
C/2009 UG89 (Lemmon)
Date TT R. A. (2000) Decl. Delta r Elong. Phase m1 m2
2010 04 24 21 09.36 +00 08.0 4.591 4.427 74.4 12.6 18.8
2010 05 04 21 06.22 +01 40.1 4.378 4.389 84.0 13.2 18.6
2010 05 14 21 01.25 +03 15.2 4.164 4.352 93.9 13.4 18.5
2010 05 24 20 54.16 +04 52.3 3.958 4.316 104.0 13.2 18.3
2010 06 03 20 44.73 +06 29.5 3.765 4.282 114.2 12.5 18.2
2010 06 13 20 32.80 +08 04.2 3.593 4.249 124.3 11.4 18.1
2010 06 23 20 18.40 +09 32.3 3.450 4.217 133.7 10.0 17.9
2010 07 03 20 01.81 +10 49.4 3.343 4.187 141.6 8.7 17.8
2010 07 13 19 43.60 +11 50.7 3.276 4.158 146.1 7.8 17.8
2010 07 23 19 24.64 +12 32.4 3.253 4.131 145.6 8.0 17.7
2010 08 02 19 05.96 +12 53.5 3.273 4.105 140.3 9.1 17.7
2010 08 12 18 48.51 +12 55.1 3.333 4.081 132.0 10.6 17.7
2010 08 22 18 33.05 +12 40.9 3.427 4.059 122.3 12.2 17.8
2010 09 01 18 20.03 +12 15.8 3.547 4.038 112.2 13.4 17.8
2010 09 11 18 09.59 +11 44.3 3.686 4.019 102.1 14.2 17.9
2010 09 21 18 01.67 +11 10.9 3.835 4.002 92.2 14.5 17.9
2010 10 01 17 56.06 +10 38.8 3.987 3.987 82.8 14.4 18.0
2010 10 11 17 52.48 +10 10.7 4.136 3.973 73.7 14.0 18.1
2010 10 21 17 50.66 +09 48.4 4.275 3.962 65.2 13.2 18.1
The orbit given above indicates an approach to Jupiter within 0.5 AU
in 2009 September. Before this approach the heliocentric orbit varied between
elliptical and hyperbolic. With respect to the solar-system barycenter, the
original and future 1/a are +0.00016198 and -0.00143359, respectively.
Gareth V. Williams (C) Copyright 2010 MPC M.P.E.C. 2010-H68
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