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  • MPEC 1999-X02 : 1998 SN165

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    M.P.E.C. 1999-X02                                Issued 1999 Dec. 1, 19:10 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
    
                 BMARSDEN@CFA.HARVARD.EDU or GWILLIAMS@CFA.HARVARD.EDU
              URL http://cfa-www.harvard.edu/iau/mpc.html  ISSN 1523-6714
    
                                      1998 SN165
    
                               Revision to MPEC 1999-N17
    
    Observations:
         J98SG5N 8C1999 08 10.43991 23 36 35.57 -00 52 59.1          21.1 R      675
         J98SG5N 8C1999 08 10.46567 23 36 35.48 -00 52 59.7          21.2 R      675
         J98SG5N 8C1999 08 10.48013 23 36 35.42 -00 53 00.3          21.2 R      675
         J98SG5N 8C1999 09 13.39518 23 34 05.67 -01 09 20.5                      695
         J98SG5N 8C1999 09 13.46701 23 34 05.31 -01 09 22.6                      695
         J98SG5N  C1999 10 09.22060 23 32 04.42 -01 23 08.1          20.9 V      691
         J98SG5N  C1999 10 09.24239 23 32 04.33 -01 23 09.0          20.7 V      691
         J98SG5N  C1999 10 09.26400 23 32 04.21 -01 23 10.0          20.8 V      691
    
    Observer details:
    675 Palomar Mountain.  Observers P. Nicholson, B. Gladman, J. Burns.
        Measurer B. Gladman.  5-m reflector + CCD.
    691 Steward Observatory, Kitt Peak.  Observer N. Danzl.  Measurer
        A. E. Gleason.  0.9-m Spacewatch telescope.
    695 Kitt Peak.  Observers D. Davis, B. Gladman, C. Neese.  Measurer
        B. Gladman.  4-m reflector + CCD.
    
    First and last observations above in comparison with prediction:
    Residuals in seconds of arc and reference
    990810 675 65.0- 28.4-    991009 691 78.8- 35.0-    MPC 35441
    
    Orbital elements:
    1998 SN165
    Epoch 1999 Aug. 10.0 TT = JDT 2451400.5                 Marsden
    M 264.94911              (2000.0)            P               Q
    n   0.00419102     Peri.  259.13917     -0.02149102     -0.99962728
    a  38.0998418      Node   192.13029     +0.94572317     -0.01486472
    e   0.0255793      Incl.    4.59533     +0.32426197     -0.02289847
    P 235              H    5.8           G   0.15           U   6
    Residuals in seconds of arc
    980915 691  0.2+  0.4-    980928 691  0.4-  1.0-    990913 695  0.1-  0.3+
    980915 691  0.6-  0.7-    980928 691  0.0   0.7-    991009 691  0.1+  0.2+
    980923 691  0.1-  0.5+    990810 675  0.0   0.0     991009 691  0.2+  0.1-
    980923 691  1.0+  1.0+    990810 675  0.1+  0.1+    991009 691  0.2-  0.4-
    980923 691  0.2+  1.6+    990810 675  0.0   0.2-
    980928 691  0.2-  0.3-    990913 695  0.0   0.1+
    
    Ephemeris:
    1998 SN165               a,e,i = 38.10, 0.03, 5                  q = 37.125
    Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
    1999 11 28    23 29.80   -01 40.4   37.901   38.202   107.1     1.4    21.8
    1999 12 08    23 29.78   -01 41.2   38.070   38.202    97.0     1.5    21.8
    1999 12 18    23 29.92   -01 40.9   38.243   38.201    86.8     1.5    21.8
    1999 12 28    23 30.23   -01 39.6   38.414   38.200    76.7     1.4    21.8
    2000 01 07    23 30.69   -01 37.2   38.579   38.200    66.7     1.4    21.8
    2000 01 17    23 31.31   -01 33.8   38.731   38.199    56.6     1.2    21.8
    2000 01 27    23 32.06   -01 29.5   38.867   38.198    46.7     1.1    21.8
    2000 02 06    23 32.92   -01 24.4   38.983   38.197    36.7     0.9    21.8
    
         Although some uncertainty remains, this object appears to be in a
    low-eccentricity orbit between the 2:3 and 3:4 resonances with Neptune.
    
    Brian G. Marsden             (C) Copyright 1999 MPC           M.P.E.C. 1999-X02
    

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