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MPEC 1999-N31 : 1998 RT4

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Read MPEC 1999-N30 Read MPEC 1999-N32 

M.P.E.C. 1999-N31                                Issued 1999 July 15, 20:34 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

                                   1998 RT4

Observations:
     J98R04T 5 1986 03 15.50454 09 44 55.03 +01 01 25.7                      413
     J98R04T 5 1986 03 15.55662 09 44 53.44 +01 02 24.5                      413

Observer details:
413 Siding Spring.  Trail located and measured by A. Doppler, A. Gnadig and
    G. Hahn.  1.2-m Schmidt + CCD.

First and last observations above in comparison with prediction:
Residuals in seconds of arc (or two decimals in degrees), reference and Delta-T
860315 413 0.17- 0.03-    860315 413 0.17- 0.03-    MPC 34302   +0.43 day

Orbital elements:
1998 RT4 = 1989 RV1
Id. DLR-Archenhold NEO Precovery Survey
Epoch 1999 Aug. 10.0 TT = JDT 2451400.5                 Williams
M  46.63537              (2000.0)            P               Q
n   0.21888534     Peri.  244.59636     +0.54776004     -0.83229654
a   2.7268313      Node   170.68208     +0.82088970     +0.55430411
e   0.4029930      Incl.   31.70667     -0.16155200     -0.00542396
P   4.50           H   15.1           G   0.15           U   2
Residuals in seconds of arc
860315 413  0.4+  0.0     980918 704  0.9-  0.4-    981105 699  0.0   0.7+
860315 413  0.6-  0.4+    980918 704  1.0-  0.3-    981105 699  0.5-  0.8+
890901 675  0.3-  1.9-    980918 704  0.4+  1.2-    990123 428  1.3-  1.4-
890904 675  0.4+  1.2+    980921 704  0.4-  1.0-    990123 428  0.7+  0.3-
980914 704  0.3+  0.1-    980921 704  0.8+  1.3+    990123 428  0.5+  0.0
980914 704  0.2+  1.7-    980921 704  0.4+  1.0+    990126 428  1.7+  0.3-
980914 704  0.4+  1.3-    980921 704  0.4+  0.8+    990126 428  1.1+  0.3-
980917 699  0.2-  0.5+    980921 704  0.2+  0.6+    990126 428  0.4-  0.4-
980917 699  0.2-  0.3+    980927 699  0.1-  0.8+    990304 428  1.1-  0.1-
980917 699  0.1-  0.5+    980927 699  0.1+  0.8+    990304 428  0.5+  0.1+
980918 704  0.9-  0.2-    980927 699  0.2+  0.5+
980918 704  0.1-  0.7-    981105 699  0.1+  0.5+

Gareth V. Williams           (C) Copyright 1999 MPC           M.P.E.C. 1999-N31

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