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  • MPEC 1999-N21 : 1999 AN10

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    M.P.E.C. 1999-N21                                Issued 1999 July 12, 21:23 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  ISSN 1523-6714
    
                                       1999 AN10
    
                               Revision to MPEC 1999-K07
    
    Observations:
         J99A10N 5 1955 01 26.40208 08 38 25.08 +72 39 45.7                      675
         J99A10N 5 1955 01 26.43333 08 37 35.21 +72 40 05.4                      675
         J99A10N 5 1955 01 26.43750 08 37 26.05 +72 40 07.3                      675
         J99A10N 5 1955 01 26.44583 08 37 13.24 +72 40 11.7                      675
    
    Observer details:
    675 Palomar Mountain.  Earlier trail located and measured by A. Gnadig and
        A. Doppler.  Later trail measured (and earlier trail remeasured) by
        G. V. Williams.  1.2-m Oschin Schmidt.
    
    Orbital elements:
    1999 AN10                                                            PHA 0.015A
    Epoch 1999 Aug. 10.0 TT = JDT 2451400.5                 Williams
    M  70.04961              (2000.0)            P               Q
    n   0.55941450     Peri.  268.25229     -0.56757144     +0.68457751
    a   1.4587479      Node   314.55304     -0.21820270     -0.66076120
    e   0.5621418      Incl.   39.93185     -0.79388302     -0.30781206
    P   1.76           H   18.0           G   0.15           U   2
    Residuals in seconds of arc
    550126 675  3.1-  0.3+    990123 071  0.1+  0.0     990214 587  0.9-  0.2-
    550126 675  6.5+  2.0+    990124 046  0.4+  0.0     990214 587  0.3+  0.2+
    550126 675  3.4-  1.7+    990124 046  0.4+  0.1-    990215 046  0.5-  0.3-
    550126 675  1.4+  1.7+    990124 046  0.0   0.3-    990215 046  0.3+  0.6+
    990113 704  1.2+  0.8+    990124 046  0.8+  0.3-    990215 046  0.1+  0.6+
    990113 704 (0.1+  2.5-)   990124 658  0.3+  0.6-    990215 046  0.3+  0.5+
    990113 704  0.6-  0.5-    990124 658  0.1-  0.3-    990218 104  0.1+  1.0-
    990113 704  0.4+  0.4+    990124 658  0.3+  0.6-    990218 587  0.0   1.0+
    990113 704  1.9-  0.1-    990126 071  0.4+  0.4+    990218 587  0.8-  0.2-
    990114 557  0.2-  0.5-    990126 071 (0.2-  2.8+)   990218 587  0.6+  0.7+
    990114 557  0.0   0.0     990126 402  0.5+  0.7+    990218 587  1.0+  0.7-
    990115 046  0.1+  0.0     990126 402  0.2-  0.3+    990220 428  0.8+  0.7-
    990115 046  0.0   0.2+    990126 402  0.5+  0.7+    990220 428  1.0+  1.4-
    990115 046  0.3-  0.5-    990126 360  0.4+  0.3+    990515 426  0.7-  0.2+
    990115 046  0.1-  0.2-    990126 360  0.1-  0.6+    990515 426  0.2-  0.4-
    990115 046  0.3-  0.1+    990126 360  0.4+  0.4+    990515 426  0.5-  0.2+
    990115 587  0.8+  0.7+    990127 587  0.4-  0.0     990516 426  0.8-  0.2-
    990115 587  0.0   1.0+    990127 587  0.2-  0.4-    990516 426  1.3-  0.1-
    990116 704  0.6+  0.4-    990130 402  0.8+  0.6+    990516 426  0.8-  0.7+
    990116 704  0.2+  0.0     990130 402  0.1+  0.2-    990523 426  1.7-  0.2-
    990116 704  0.7-  0.3+    990130 402  0.2+  0.3-    990523 426  1.6-  0.5+
    990116 704  0.3+  0.6+    990204 402  0.3+  0.1-    990526 950  0.3-  0.6+
    990117 046  0.0   0.0     990204 402  0.1+  0.1-    990526 950  0.5+  0.1+
    990117 046  0.2+  0.3-    990207 587  0.5+  0.1-    990526 950  0.8-  0.2-
    990117 046  0.0   0.1+    990207 587  0.8+  0.3+    990527 950  0.3+  1.3+
    990117 046  0.1+  0.0     990207 587  0.6+  0.5-    990527 950  0.0   1.2+
    990117 402  0.4-  0.1+    990208 704 (0.9+  2.8+)   990609 675  0.3+  0.6+
    990117 402  0.1-  0.1-    990208 704  0.6+  0.3+    990609 675  0.1+  0.6+
    990117 402  0.4-  0.1+    990208 704  0.4-  0.8+    990609 675  0.1+  0.7+
    990117 540  0.6-  0.3+    990208 704  0.2-  0.0     990609 675  0.1+  0.6+
    990117 540  0.5-  0.1+    990208 704  0.6-  0.7+    990609 675  0.1+  0.6+
    990117 540  2.0-  0.1+    990208 900  0.2-  0.0     990609 675  0.1+  0.6+
    990119 151  0.8-  0.3-    990208 900  0.4+  0.4-    990620 046  0.9-  1.9-
    990119 151  0.6+  0.1+    990208 402  0.0   0.4-    990702 413  0.4+  1.1+
    990119 151  3.3-  1.4+    990208 402  0.1+  0.8-    990708 587  0.4-  1.4-
    990119 587  0.1+  0.1-    990208 402  0.4+  0.8-    990708 658  0.1-  0.8-
    990119 587  0.2-  0.1+    990209 360  0.5+  0.0     990708 658  0.2+  0.1-
    990121 046  0.0   0.3-    990209 360  0.7+  0.3+    990708 658  0.7+  0.2+
    990121 046  0.5+  0.2-    990209 360  0.4+  0.2+    990709 658  0.1-  0.5+
    990121 046  0.1+  0.1-    990212 587  0.0   0.8+    990709 658  0.7-  0.7+
    990121 587  0.2-  0.5-    990212 587  0.1+  0.8-    990709 658  0.6+  0.4+
    990121 587  0.1-  0.3-    990212 587  0.1+  0.2-
    990123 071  0.0   0.1+    990214 587  0.4-  0.1+
    
    Ephemeris:
    1999 AN10                a,e,i = 1.46, 0.56, 40                  q = 0.6387
    Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
    1999 07 11    01 00.58   +31 25.4    1.096    1.393    82.4    46.4    20.7
    1999 07 21    00 57.23   +37 29.3    1.082    1.474    89.2    43.6    20.7
    1999 07 31    00 48.15   +43 13.5    1.070    1.551    96.1    40.6    20.7
    1999 08 10    00 31.51   +48 22.8    1.064    1.624   102.8    37.5    20.7
    1999 08 20    00 05.90   +52 32.2    1.066    1.692   109.0    34.4    20.7
    1999 08 30    23 32.06   +55 13.2    1.080    1.756   114.3    31.6    20.7
    1999 09 09    22 54.25   +56 05.3    1.107    1.816   118.3    29.2    20.8
    1999 09 19    22 19.32   +55 11.0    1.150    1.872   120.5    27.6    20.9
    1999 09 29    21 52.54   +52 58.1    1.208    1.924   120.8    26.6    21.0
    1999 10 09    21 35.38   +50 02.4    1.280    1.972   119.3    26.2    21.2
    1999 10 19    21 26.86   +46 54.5    1.366    2.016   116.3    26.3    21.4
    1999 10 29    21 25.15   +43 55.2    1.462    2.057   112.4    26.5    21.6
    1999 11 08    21 28.54   +41 15.8    1.567    2.094   107.7    26.8    21.8
    1999 11 18    21 35.77   +39 01.9    1.679    2.127   102.7    27.0    22.0
    
         A trail of 1999 AN10 was located and measured by A. Gnadig and A. Doppler
    on the Digital Sky Survey (DSS) copy of a 45-min red-exposure Palomar Sky
    Survey I (PSS) plate.  Gnadig and Doppler remarked on the difficulty of their
    trail measurement.  Examination of the DSS shows an extremely weak image.  In
    view of this, it was decided to remeasure the trail from the PSS prints, as
    well as measuring the corresponding trail from the 12-min blue-exposure plate.
    Extracts from the two prints were scanned and the resulting images were
    measured.  The r.m.s. of the fit of 25-30 USNO-A2.0 comparison stars was 0".22.
    As examination of the residual block above shows, the trail-end measures are
    clearly not consistent at the subarcsecond level, partly because of the poor
    definition of the trail ends and partly because the times of exposure of the
    PSS plates were recorded only to the nearest minute.  The apparent better
    agreement of the start of the first trail with the second-trail measures
    is presumably fortuitous.
    
         Computations by B. G. Marsden and G. V. Williams show that the miss
    distance on 2027 Aug. 7.3 UT will be 0.0026 AU.  The subsequent revolution
    period of a little over 1.74 years precludes the possibility of any further
    significant approach to the earth until Feb. 2076, when the miss distance
    can be expected to be less than 0.05 AU (although it cannot be as small
    as 0.008 AU).
    
    Gareth V. Williams           (C) Copyright 1999 MPC           M.P.E.C. 1999-N21
    

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