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    • MPEC 2011-C71 : 2009 HU2

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    M.P.E.C. 2011-C71                                Issued 2011 Feb. 12, 11:58 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.net/    ISSN 1523-6714

                                   2009 HU2

                           Revision to MPEC 2009-H22

Additional Observations:
     K09H02U KC2001 04 17.47985 14 23 14.96 +01 30 33.5          20.3 VoEC071644
     K09H02U KC2001 04 17.48510 14 23 14.58 +01 30 39.9          20.5 VoEC071644
     K09H02U KC2001 04 17.49036 14 23 14.18 +01 30 45.9          20.4 VoEC071644
     K09H02U KC2011 02 10.37413713 22 31.06 -11 39 52.1          21.8 VrEC071H21
     K09H02U KC2011 02 10.39225613 22 31.35 -11 39 48.2          22.1 VrEC071H21
     K09H02U KC2011 02 10.41095413 22 31.60 -11 39 43.9          21.9 VrEC071H21

Observer details:
644 Palomar Mountain/NEAT.  Observers E. F. Helin, S. Pravdo, K. Lawrence,
    K. Kuluhiwa, M. Hicks, R. Thicks.  Measurers S. Foglia, M. Tombelli.
    1.2-m Oschin Schmidt + CCD.
H21 Astronomical Research Observatory, Westfield.  Observer R. Holmes.
    Measurers S. Foglia, R. Holmes, T. Vorobjov.  0.81-m f/4.0 astrograph
    + CCD.

First and last observations above in comparison with prediction:
Residuals in seconds of arc (or two decimals in degrees), reference and Delta-T
010417 644 0.05+ 0.00-    110210 H21 21.8-  3.8+    MPO159817   -0.0024 day

Orbital elements:
2009 HU2                                                 Earth MOID = 0.0873 AU
Epoch 2011 Feb. 8.0 TT = JDT 2455600.5                  MPC
M 191.53938              (2000.0)            P               Q
n   0.48660473     Peri.  166.43072     +0.98876413     +0.14707847
a   1.6008544      Node   185.33235     -0.14922481     +0.98168397
e   0.3220352      Incl.   16.70293     +0.00880027     +0.12109709
P   2.03           H   18.4           G   0.15           U   3
Residuals in seconds of arc
010417 644  0.2-  0.4-    090420 291  0.4+  0.0     090426 291  0.2-  0.1-
010417 644  0.0   0.4-    090420 291  0.2-  0.0     090427 691  0.2+  0.3-
010417 644  0.0   0.9-    090420 291  0.2-  0.0     090427 691  0.1-  0.2+
090419 691  0.5-  0.0     090420 673  1.5+  0.1-    090427 691  0.2-  0.3+
090419 691  0.6-  0.3-    090420 673  0.8+  1.1-    090427 291  0.1-  0.2-
090419 691  0.5-  0.0     090420 673  0.4+  0.1+    090427 291  0.0   0.0
090419 G96  0.1-  0.5-    090420 673  0.0   0.8+    090427 291  0.2-  0.4+
090419 G96  0.1-  0.1-    090421 291  0.4-  0.1+    090429 291  0.3+  0.2-
090419 G96  0.5+  0.4-    090421 291  0.6-  0.1-    090429 291  0.3+  0.0
090419 G96  0.0   0.5-    090422 H55  0.3-  0.1+    090501 291  0.3-  0.2+
090419 198  0.6+  0.6+    090422 H55  0.4-  0.1+    090501 291  0.0   0.1-
090419 198  0.2+  0.8+    090422 H55  0.0   0.3+    090501 291  0.2+  0.1-
090419 198  0.4+  0.4+    090422 H55  0.4+  0.1+    090519 H55  0.1+  0.6+
090419 J95  0.2+  0.9-    090423 691  0.1-  0.4-    090519 H55  0.4+  0.5+
090419 198  0.2+  1.0+    090423 691  0.2+  0.6-    090519 H55  0.7+  0.3+
090419 J95  0.9+  0.1+    090423 691  0.3-  0.1+    090612 291  0.2+  0.3-
090419 J95  0.1-  0.1-    090423 H55  0.1-  0.0     090612 291  1.1+  0.1-
090420 J95  0.5+  1.1+    090423 H55  0.4-  0.1+    090612 291  0.4-  0.9-
090420 H01  0.0   0.3+    090423 H55  0.7-  0.4+    090713 291  0.2-  0.8+
090420 H01  0.1-  0.2+    090424 291  0.3-  0.4+    090713 291  0.1-  1.1+
090420 H01  0.0   0.2+    090424 291  0.3+  0.5-    110210 H21  0.9-  1.5+
090420 H36  1.0+  0.0     090424 291  0.2-  0.5+    110210 H21  0.0   0.8+
090420 H36  0.2+  0.2+    090426 291  0.0   0.2-    110210 H21  0.2+  0.4+
090420 H36  0.5+  0.0     090426 291  0.1-  0.2-

Ephemeris:
2009 HU2                 a,e,i = 1.60, 0.32, 17                  q = 1.0853
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
2011 01 13    13 04 37.9 -11 56 30   1.8263  2.1163    92.8    27.7    22.6
...
2011 01 28    13 16 35.4 -12 11 07   1.6303  2.1147   105.2    26.7    22.3
...
2011 02 05    13 20 45.1 -11 58 09   1.5281  2.1118   112.5    25.6    22.1
...
2011 02 11    13 22 39.9 -11 37 09   1.4539  2.1088   118.3    24.3    22.0
2011 02 12    13 22 52.5 -11 32 38   1.4418  2.1082   119.3    24.1    21.9
2011 02 13    13 23 03.2 -11 27 48   1.4298  2.1076   120.3    23.9    21.9
...
2011 02 19    13 23 25.4 -10 52 19   1.3601  2.1036   126.5    22.2    21.8
...
2011 02 27    13 21 57.4 -09 46 19   1.2742  2.0970   135.3    19.4    21.5
...
2011 03 14    13 12 53.7 -06 41 49   1.1435  2.0810   153.5    12.3    21.0

Timothy B. Spahr             (C) Copyright 2011 MPC           M.P.E.C. 2011-C71

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